== Upcoming Fusion and Plasma events ==

Please feel free to add events.

=== 2026 ===

{| class="wikitable" style="width: 100%" border="1"
|-
! scope="col" width="20%" | Date (2026)
! scope="col" width="20%" | Location
! scope="col" width="60%" | Conference/Meeting
|-
| April 20-24 || Córdoba, Spain || [https://ishw2026.com 25th International Stellarator and Heliotron Workshop] (ISHW)
|-
| June 8-12 || Kudowa-Zdrój, Poland || [http://kudowaschool.ipplm.pl/ 18th Kudowa Summer School 'Towards Fusion Energy']
|-
| June 15-18 || Prague, Czech Republic || [http://www.plasmaconference.cz/ 31st Symposium on Plasma Physics and Technology] (SPPT)
|-
| June 29-July 3 || Edinburgh, Scotland (UK) || [https://epsplasma2026.com/ 2026 European Physical Society Conference on Plasma Physics] (EPS-CPP)
|-
| October 11-16 || Busan, Korea || [http://aappsdpp.org/AAPPSDPPF/ 10th Asia-Pacific Conference on Plasma Physics] (AAPPS-DPP2026)
|}

== Periodic meetings ==

The following FusionWiki entries attempt to both provide a record of historic meetings and direct links to proceedings:
* The [[IAEA Fusion Energy Conference]] (FEC)
* The [[European Physical Society Conference on Plasma Physics]] (EPS-CPP)
* The [[European Conference on Plasma Diagnostics]] (ECPD)
* The [[International Congress on Plasma Physics]] (ICPP)
* The [https://engage.aps.org/dpp/meetings/annual-meeting Annual Meeting of the Division of Plasma Physics of the American Physical Society] (APS-DPP)
* The [[International Stellarator and Heliotron Workshop]] (ISHW)
* The [[European Fusion Theory Conference]] (EFTC)
* The [[Conference on Plasma Surface Interactions]] (PSI)
* The [[Symposium on Fusion Technology]] (SOFT)
* The [[Symposium On Fusion Engineering]] (SOFE)
* The [[EU-US Transport Task Force Meeting]] (TTF)
* The [[International Toki Conference]] (ITC)
* The [[Topical Conference on High Temperature Plasma Diagnostics]] (HTPD)
* The [http://www.sherwoodtheory.org/ Sherwood Theory Conference]
* The [[International Conference on Tritium Science and Technology]] (TRITIUM)
* The [[International Symposium on Fusion Nuclear Technology]] (ISFNT)
* The [[Coordinated Working Group Meeting]] (CWGM)
* The [http://varenna-lausanne.epfl.ch/ Theory of Fusion Plasmas: Joint Varenna-Lausanne International Workshop] (Varenna-Lausanne even years)
* The International Conference on Fusion Reactor Materials (ICFRM)

See also [[:Category:Conferences]].

== Meeting lists at other sites ==

* [http://ieee-npss.org/directory-of-plasma-conferences/ IEEE Nuclear and Plasma Sciences Society Directory of Plasma Conferences].
* [https://www.iter.org/conferences Calendar maintained at ITER of upcoming conferences on fusion science, fusion technology, plasma physics and energy].
* [https://www-amdis.iaea.org/w/index.php/Calendar_of_Meetings Calendar maintained by IAEA Atomic and Molecular Data Unit of meetings related to A+M+PMI processes and data for fusion].
* [http://fusenet.eu/events Calendar maintained by the European Fusion Education Network (FuseNet) of upcoming fusion related events].
* [http://crpp.epfl.ch/conferences_e Calendar maintained at Centre de Recherches en Physique des Plasmas, EPFL, of conferences on plasma physics research].
* [http://www.conference-service.com/conferences/plasma-and-gas-discharge-physics.html COMS Conferences and Meetings on Plasma and Gas-discharge Physics].
* [http://fire.pppl.gov/meetings_fusion.htm Calendar maintained at Fire, PPPL, of fusion meetings].
* [http://www.jspf.or.jp/calendar/cldrb.html Plasma and Fusion Calendar maintained by the Japan Society of Plasma Science and Nuclear Fusion Research].
* [https://burningplasma.org/newsandevents/?article=enews&issue=current Calendar maintained by the United States Burning Plasma Organization (USBPO) of fusion energy events].

LNF:Nationally Funded Projects

2025-12-10T09:49:45Z

Admin: /* Instructions to add a new project to the list */

Nationally funded projects of the [[Laboratorio Nacional de Fusión]].

== LNF - Nationally funded projects ==

<categorytree mode="pages">LNF Nationally Funded Projects - finished</categorytree>

<categorytree mode="pages">LNF Nationally Funded Projects</categorytree>

<div align="center">
{|
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{|
! 
[[Media:20240301 Instrucciones-comunicacion-publicidad-ayudas OK.pdf|Instrucciones relativas a los requisitos de publicidad en proyectos de los planes nacionales]] 
|}
|}
</div>

== Instructions to add a new project to the list ==

''Please read the following brief instructions''
# Log in to the FusionWiki. If you don't have an account, request one by clicking 'Create account' in the left-hand menu.
# ''Type the name of your project page in the field below''. The required format is: 'LNF:Title of my project' (without the apostrophes) (Star-End year). Note the 'LNF:' at the beginning!
# Click 'Create new project page'. Your project page will be created. Edit and save (please use 'Show preview' before saving the final version).
# Use the template provided to provide the project information
# The page can be written in English or Spanish

<inputbox>
type=create
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buttonlabel=Create new project page with this title
preload=LNF:Project_template
</inputbox>

Once you save the new project page, it will automatically be included in the list above ('''provided''' you don't delete the relevant lines at the end of your project page).

2025-10-14T11:07:44Z

2025-10-14T10:57:31Z

Admin: /* LNF - Nationally funded projects */

Nationally funded projects of the [[Laboratorio Nacional de Fusión]].

== LNF - Nationally funded projects ==

<categorytree mode="pages">LNF Nationally Funded Projects</categorytree>

<div align="center">
{|
|class="wikipage" style="border:3px solid #3f63af"|
{|
! 
[[Media:20240301 Instrucciones-comunicacion-publicidad-ayudas OK.pdf|Instrucciones relativas a los requisitos de publicidad en proyectos de los planes nacionales]] 
|}
|}
</div>

== Instructions to add a new project to the list ==

''Please read the following brief instructions''
# Log in to the FusionWiki. If you don't have an account, request one by clicking 'Create account' in the left-hand menu.
# ''Type the name of your project page in the field below''. The required format is: 'LNF:Title of my project' (without the apostrophes) (Star-End year). Note the 'LNF:' at the beginning!
# Click 'Create new project page'. Your project page will be created. Edit and save (please use 'Show preview' before saving the final version).

<inputbox>
type=create
placeholder=LNF:Title of my project
buttonlabel=Create new project page with this title
preload=LNF:Project_template
</inputbox>

Once you save the new project page, it will automatically be included in the list above ('''provided''' you don't delete the relevant lines at the end of your project page). The list is updated once per hour, hence new projects may take this long to appear.

LNF:Nationally Funded Projects

2025-10-14T10:03:37Z

Admin: /* LNF - Nationally funded projects */

Nationally funded projects of the [[Laboratorio Nacional de Fusión]].

== LNF - Nationally funded projects ==
[[:Category:LNF Nationally Funded Projects]]


<div align="center">
{|
|class="wikipage" style="border:3px solid #3f63af"|
{|
! 
[[Media:20240301 Instrucciones-comunicacion-publicidad-ayudas OK.pdf|Instrucciones relativas a los requisitos de publicidad en proyectos de los planes nacionales]] 
|}
|}
</div>

== Instructions to add a new project to the list ==

''Please read the following brief instructions''
# Log in to the FusionWiki. If you don't have an account, request one by clicking 'Create account' in the left-hand menu.
# ''Type the name of your project page in the field below''. The required format is: 'LNF:Title of my project' (without the apostrophes) (Star-End year). Note the 'LNF:' at the beginning!
# Click 'Create new project page'. Your project page will be created. Edit and save (please use 'Show preview' before saving the final version).

<inputbox>
type=create
placeholder=LNF:Title of my project
buttonlabel=Create new project page with this title
preload=LNF:Project_template
</inputbox>

Once you save the new project page, it will automatically be included in the list above ('''provided''' you don't delete the relevant lines at the end of your project page). The list is updated once per hour, hence new projects may take this long to appear.

TJ-II:Experimental proposals

2025-10-14T10:02:04Z

Admin:

[[File:TJII_model.jpg|400px|thumb|right|TJ-II Model]]

== Important documents ==

[[Media:TJ-II_experimental_session_report.ppt|Presentation template for pre- and post-session reporting]]

== Creation of a new proposal ==
To submit an experimental proposal, please use [https://forms.gle/aNHbrRyVjpQS7MJt7 this form].
The table below is updated manually by the campaign management.

== Experimental proposals, Spring 2024 ==

Creation date: 04/12/2023 10:21. Please do no edit this table. To submit a post-deadline proposal, please, use the link above.

[[Media:Minutes_of_the_Access_Committee_Meeting_Spring_2024.pdf| Minutes]] of the TJ-II Access Committee Meeting, January 23, 2023 .

{| class="wikitable"
! Title !! Main proponent !! Main proponent's affiliation !! Other proponents !! Specific objectives of the experiment
|-
| Impact of plasma current on L-H transitions at TJ-II||van Milligen, Boudewijn||CIEMAT||Teresa Estrada (CIEMAT), Isabel García-Cortés (CIEMAT), Benjamin Carreras (UC3M), Eduardo de la Cal (CIEMAT), Igor Voldiner (CIEMAT), Arturo Alonso (CIEMAT)||Recent work has clarified the important role of the net plasma current, Ip, in facilitating L-H confinement transitions. Draft: https://drive.google.com/file/d/1ca7hgen5--xt9yeYt0qhjMrMvgPEfAfP/view?usp=drive_link In the present study, we will verify this effect by systematically varying the plasma current using the external OH control coils.
|-
| Impact of rationals on Pellet Enhanced Confinement at TJ-II||García-Cortés, Isabel||CIEMAT||Kieran McCarthy (CIEMAT), Boudewijn van Milligen (CIEMAT), Benjamin Carreras (UC3M), Luis García (UC3M), Daniel Medina-Roque (CIEMAT) ||Pellet Enhanced Confinement [L. García, I. García-Cortés, B. Carreras, K. McCarthy, and B. van Milligen. The effect of pellet injection on turbulent transport in TJ-II. Phys. Plasmas, 30:092303, 2023] is expected to vary with the radial location of low order rational surfaces in the plasma edge. The radial location of these rational surfaces can be controlled by modifying the plasma current using the external OH control coils.
|-
| Spectroscopic Gas Puff Imaging edge plasma characterisation||de la Cal, Eduardo||LNF-CIEMAT||Voldiner Igor, van Milligen Boudewijn||1. Commissioning of the new camera and image intensifier. 2. Continue the characterization of the edge plasma ne and Te profiles with other diagnostics. 3. Vary the He injection rate to look for possible local perturbation in the plasma edge. 4. Optimize the camera and image intensifier settings (recording speed, exposure time, active sensor area, amplification voltage) together with the He rate level to maximize the recording speed and SNR.
|-
| Origin of SOL turbulence||Wu||Southwestern Institute of Physics||Patrick H. Diamond (University of California San Diego), Min Xu (Southwestern Institute of Physics), Carlos Hidalgo (CIEMAT)||
1. Understand the origin of SOL turbulence. According to Wu et al. 2023 NF, we consider edge turbulence spreading and local SOL interchange turbulence as the main origins of SOL turbulence. We quantify both mechanism and compare their contribution to the SOL turbulence.
2. Understand the impact of edge turbulence spreading on the SOL width. We try to clarify the relative contributions of turbulence spreading from the edge and local SOL production in determining the SOL widths.
|-
| Llight-impurity powder injection in TJ-II plasma edge||Alfonso de Castro Calles||CIEMAT||Kieran McCarthy (CIEMAT), Federico Nespoli (PPPL), Naoki Tamura (LHD)||This proposal will study the effect of injecting light impurity species, in the form of powder, in the TJ-II plasma edge region. Similar experiments were performed in the last campaign using lithium hydride powder and a positive effect on plasma confinement was found. Such effects were observed in other devices (LHD) using boron powder and complex physics questions related to amelioration of turbulent energy transport and real time wall conditioning effects were claimed to play a main role.
|-
| Turbulence characterization of pellet-induced enhanced confinement phase at TJII||Isabel García-Cortés||CIEMAT||K. McCarthy (CIEMAT), T. Estrada (CIEMAT, B. van Milligen (CIEMAT), HIBP group (CIEMAT, Institute of Plasma Physics, National Science Center Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine) and TJ-II Team||In TJ-II, cryogenic pellet fuelling is seen to induce bifurcation-like transitions to improved performance in terms of stored energy, energy confinement and fusion triple product, this being better than gas-puff scenarios for similar densities. However, understanding of the full underlying physics of such a high performance is unknown. A broad full characterization of this phase is needed. The wide range of TJ-II diagnostics can help study this, in particular, turbulence levels and properties.
|-
| Investigation of pellet cloud dynamics in TJ-II in the presence of magnetic island using fast-framing video observation||Kocsis, Gabor||Centre for Energy Research||Tamás Szepesi (Centre for Energy Research), Nerea Panadero (CIEMAT), Kieran McCarthy (CIEMAT), Julio Hernández-Sánchez (CIEMAT)||The aim is to study the interaction of H pellets and TESPELs with the plasma by evaluating fast-framing video data. Similar experiments have already been performed at TJ-II, in which drifting clouds were observed both with H and VB filters with time resolution up to 700 kHz. Last experiments indicated that magnetic islands can change the cloud drift, suppressing it. Thus, we propose to investigate this by varying the island location and size through which we shoot both H pellets and TESPEL.
|-
| Internal density measurements of plasmoid in hydrogen pellet||Motojima., Gen||NIFS||N. Panadero (CIEMAT), K. J. McCarthy (CIEMAT), S. Kado (Kyoto University)||The objective is to evaluate the plasmoid density of hydrogen pellets to understand the ablation. Measurement of plasmoid density has been conducted in LHD and Heliotron J. There is a difference between them, probably due to the difference in background plasma parameters. If the plasmoid density is also evaluated in TJ-II, it should help to understand the mechanism of pellet ablation. We have obtained initial data from previous experiments and would like to extend it in the current experiment.
|-
| Investigation of the impact of the fast-ion losses induced by pellet injection on the density limit in TJ-II plasmas ||López-Miranda, Belén||CIEMAT||Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT), Álvaro Cappa (CIEMAT), Andrés Bustos (CIEMAT), Juan Fraguas (CIEMAT), David Jiménez-Rey (CIEMAT), José Luis Velasco (CIEMAT), Pedro Pons-Vilallonga (CIEMAT), Arturo Alonso (CIEMAT), Claudia Salcuni (University of Trieste), Teresa Estrada (CIEMAT), Josep María Fontdecaba (CIEMAT), Raúl García (CIEMAT), Isabel García-Cortés (CIEMAT), Julio Hernández-Sánchez (CIEMAT), Daniel Medina (CIEMAT), Kieran Joseph McCarthy (CIEMAT), Jaime de la Riva (CIEMAT)||Stellarator plasmas can collapse prematurely, this is a challenge in reactor development, so methods are required to overcome the density limit (DL). The aim of this work is to study the impact on the DL of fast-ion (FI) losses after cryogenic pellet in the TJ-II. The injection of pellets contributes to increase the density above the Sudo limit and modifies the radial density profile, and FI losses affect plasma performance. The DL should be defined considering the role of these FI.
|-
| Commissioning of fast camera for LBO diagnostic||Panadero, Nerea||CIEMAT||B. López-Miranda (CIEMAT), J. Hernández-Sánchez (CIEMAT), E. de la Cal (CIEMAT), A. Baciero (CIEMAT), F. Medina (CIEMAT), I. Pastor (CIEMAT), R. García (CIEMAT)||In the last campaign, we tried to install the fast cameroa to determine the penetration of LBO impurities. However, the preliminary results were not entirely satisfactory. For this reason, thorough alignment, focusing and recordings of impurities injected into the plasma are required prior to the experimental sessions.
|-
| Commissioning of the spectral scanning system ||López-Miranda, Belén ||CIEMAT||Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Raúl García-Gómez (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT)||During previous campaigns we employed the spectral scanning system in order to determine the Zeff of the plasma. However, the small signal obtained with the system required an improvement, by decreasing the spectral rotating mirror speed. Fort his reason, an upgrade is performed reducing this speed.
|-
| Commissioning of the new fast camera for spectroscopic gas puff imaging (SGPI) and pellet injection (PI)||Panadero, Nerea||CIEMAT||E de Cal (CIEMAT), Igor Voldiner (CIEMAT), R. García (CIEMAT), J. Hernández-Sánchez (CIEMAT)||A new fast camera (Photron Fastcam Nova S20) is now available for SGPI or PI experiments. It far exceeds current cameras capabilities, with megapixel recording speeds of up to 20 kfps with a texp, min = 0.2 μsm and max recording speed of 1 Mfps at reduced resolutions. After installation and out-of-window focusing, He and PI recordings in the plasma are required before the experimental sessions.
|-
| AEs model validation: measuring iota profile in NBI plasmas ||Cappa, Álvaro||LNF-CIEMAT||K. McCarthy (CIEMAT), N. Panadero (CIEMAT), P. Pons-Villalonga (CIEMAT), O. Kozachok (CIEMAT) and TJ-II Team||The goal is to have MSE measurements in NBI plasmas exhibiting AEs activity. We expect this measurement to clarify one of the main uncertainties when AEs model validation is attempted.
|-
| Investigation of the impact of LBO impurity injection immediately after cryogenic hydrogen pellet injection (PI) on confinement time in the TJ-II plasmas ||López-Miranda, Belén ||CIEMAT||Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT), Teresa Estrada (CIEMAT), Josep María Fontdecaba (CIEMAT), Raúl García (CIEMAT), Isabel García-Cortés (CIEMAT), Julio Hernández-Sánchez (CIEMAT), Daniel Medina (CIEMAT), Kieran Joseph McCarthy (CIEMAT), Jaime de la Riva (CIEMAT)||The aim of this experiment is to study the confinement time after PI & LBO impurities into ECRH TJ-II. This is of interest since PI causes transient changes in plasma kinetic profiles, Er and turbulence. A large PI into an on-axis ECRH discharge leads to a collapse with rapid energy losses and plasma termination. In addition, radiative cooling due to impurities affects the energy, and Te decays. We intend to investigate how impurity injection by LBO immediately after PI affects transport.
|-
| Investigation of the impact of impurity and cryogenic hydrogen pellet injection on the density limit in TJ-II plasmas||Panadero, Nerea||CIEMAT||B. López-Miranda (CIEMAT), A. Baciero (CIEMAT), F. Medina (CIEMAT), I. Pastor (CIEMAT), A. Alonso (CIEMAT), C. Salcuni (University of Trieste), T. Estrada (CIEMAT), J. M. Fontdecaba (CIEMAT), I. García-Cortés (CIEMAT), R. García (CIEMAT), J. Hernández-Sánchez (CIEMAT), D. Medina-Roque (CIEMAT), k. J. McCarthy (CIEMAT), J. De la Riva (CIEMAT)||Stellarator plasmas can collapse prematurely, this is a challenge in reactor development, so methods are required to overcome DL. Here we study this DL in the TJ-II and its dependence on pellets & LBO injections. H PI can modify the radial profile & improve plasma performance. It can also increase ne above the Sudo limit. Since radiation losses scale with the square of the ne, and heavy impurities cool the plasma, the DL should be defined by the radiation from the plasma edge light impurities.
|-
| Investigation of the impact of impurity and cryogenic deuterium pellet injection on the density limit in TJ-II plasmas||Panadero, Nerea||CIEMAT||B. López-Miranda (CIEMAT), A. Baciero (CIEMAT), F. Medina (CIEMAT), I. Pastor (CIEMAT), A. Alonso (CIEMAT), C. Salcuni (University of Trieste), T. Estrada (CIEMAT), J. M. Fontdecaba (CIEMAT), I. García-Cortés (CIEMAT), R. García (CIEMAT), J. Hernández-Sánchez (CIEMAT), D. Medina-Roque (CIEMAT), k. J. McCarthy (CIEMAT), J. De la Riva (CIEMAT)||Stellarator plasmas can collapse prematurely, this is a challenge in reactor development, so methods are required to overcome DL. Here we study this DL in the TJ-II and its dependence on pellets & LBO injections. D PI can modify the radial profile & improve plasma performance. It can also increase ne above the Sudo limit. Since radiation losses scale with the square of the ne, and heavy impurities cool the plasma, the DL should be defined by the radiation from the plasma edge light impurities.
|-
| Investigation of the impact of LBO impurity injection immediately after cryogenic hydrogen pellet injection (PI) on confinement time in the TJ-II plasmas ||López-Miranda, Belén||CIEMAT||Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT), Teresa Estrada (CIEMAT), Josep María Fontdecaba (CIEMAT), Raúl García (CIEMAT), Isabel García-Cortés (CIEMAT), Julio Hernández-Sánchez (CIEMAT), Daniel Medina (CIEMAT), Kieran Joseph McCarthy (CIEMAT), Jaime de la Riva (CIEMAT)||The aim of this experiment is to study the confinement time after PI & LBO impurities into ECRH TJ-II plasmas. This is of interest since PI causes transient changes in plasma kinetic profiles, Er and turbulence. A large PI into an on-axis ECRH leads to a collapse with rapid energy losses and plasma termination. Radiative cooling due to impurities affects the energy, and Te decays. We try to study the isotope effect in transport due to LBO injection inmediately after D or H PI in H/D plasmas.
|-
| Isotope effect on pellet-induced enhanced confinement in TJ-II||I. García-Cortés||I. Gracía-Cortés (CIEMAT)||K. McCarthy (CIEMAT), T. Estrada (CIEMAT, D. Medina-Roque (CIEMAT), N. Panadero (CIEMAT), HIBP group (CIEMAT, Institute of Plasma Physics, National Science Center Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine) and TJ-II Team||High-performance plasma scenarios are achieved in NBI-heated TJ-II discharges after pellet train injections. In addition to increased density, plasma diamagnetic energy rises with respect to reference discharges by up to 70%. To date, only H2 pellets have been injected into hydrogen plasmas. However, isotope effects are critical issues for future reactor operation. We propose to use different H/D pellet/plasma combinations to extent further the current TJ-II pellet and PiEC database
|-
| Continuation of studies of hydrogen pellet plasmoid drift in different magnetic configurations||Panadero, Nerea||CIEMAT||K. J. McCarthy (CIEMAT), B. López-Miranda (CIEMAT), K. J. McCarthy (CIEMAT), A. Baciero (CIEMAT), F. Medina (CIEMAT), I. Pastor (CIEMAT), J. M. Fontdecaba (CIEMAT), I. García-Cortés (CIEMAT), R. García (CIEMAT), J. Hernández-Sánchez (CIEMAT), D. Medina-Roque (CIEMAT), J. De la Riva (CIEMAT)||The main objective of this proposal is to quantify pellet plasmoid drift in the early stages of the homogenization process, and its relationship with rational surfaces for magnetic configurations with an iota profile lower than the standard configuration. In addition, experimental results will be compared with HPI2 predictions, since these experiments will be also part of the current effort to evaluate the stellarator version of HPI2 for the TJ-II, W7-X, LHD and Heliotron J devices.
|-
| Study of the influence of fast-ion losses induced by AEs in pure NBI-heated & combined ECR and NBI plasmas.||López-miranda, Belén||CIEMAT||Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT), Álvaro Cappa (CIEMAT), Andrés Bustos (CIEMAT), Juan Fraguas (CIEMAT), David Jiménez-Rey (CIEMAT), José Luis Velasco (CIEMAT), Pedro Pons-Vilallonga (CIEMAT), Arturo Alonso (CIEMAT), Claudia Salcuni (University of Trieste), Teresa Estrada (CIEMAT), Josep María Fontdecaba (CIEMAT), Raúl García (CIEMAT), Isabel García-Cortés (CIEMAT), Julio Hernández-Sánchez (CIEMAT), Daniel Medina (CIEMAT), Kieran Joseph McCarthy (CIEMAT), Jaime de la Riva (CIEMAT)||In magnetic confinement fusion, fast-ions constitute a source of particles and free energy that, under certain conditions, drive various unstable MHD instabilities that significantly degrade fusion performance. In particular, the study of the impact of Alfvén Eigenmodes (AEs) is of special importance for controlling fast-ion transport across the magnetic field. The present experiment aims to study the influence of fast-ion losses induced by AEs in pure NBI-heated & overlapped ECR and NBI plasmas
|-
| Studies of deuterium pellet plasmoid drift in different magnetic configurations||Panadero, Nerea||CIEMAT||K. J. McCarthy (CIEMAT), B. López-Miranda (CIEMAT), K. J. McCarthy (CIEMAT), A. Baciero (CIEMAT), F. Medina (CIEMAT), I. Pastor (CIEMAT), J. M. Fontdecaba (CIEMAT), I. García-Cortés (CIEMAT), R. García (CIEMAT), J. Hernández-Sánchez (CIEMAT), D. Medina-Roque (CIEMAT), J. De la Riva (CIEMAT)||The aim of this proposal is to quantify the pellet plasmoid drift in the early stages of the homogenisation process for different hydrogen isotopes in either the working gas or the pellet. The idea is to study possible differences in plasmoid drift for different combinations of protium and deuterium. In addition, results will be compared with HPI2 predictions, as part of the current effort to evaluate the stellarator version of HPI2 for the TJ-II, W7-X, LHD and Heliotron J devices.
|-
| Assessment of the influence of pellet fuelling efficiency on the magnetic well in the TJ-II stellarator||Panadero, Nerea||CIEMAT||N. Panadero, K. J. McCarthy (CIEMAT), B. López-Miranda (CIEMAT), A. Baciero (CIEMAT), F. Medina (CIEMAT), I. Pastor (CIEMAT), J. M. Fontdecaba (CIEMAT), I. García-Cortés (CIEMAT), R. García (CIEMAT), J. Hernández-Sánchez (CIEMAT), C. Hidalgo (CIEMAT), D. Medina-Roque (CIEMAT), J. De la Riva (CIEMAT)||The aim of this proposal is to quantify the effect of the magnetic well (W) on pellet fuelling efficiency. This may be key as this magnitude could play a significant role in plasmoid behaviour. Therefore, it may be relevant for the development and design of fuelling by pellet injection (PI) in a stellarator reactor. Also, experimental results will be compared with HPI2 predictions, as part of the current effort to evaluate the stellarator version of HPI2 for the TJ-II, W7-X, LHD and Heliotron J.
|-
| Investigation of the impact of LBO impurity injection immediately after cryogenic deuterium pellet injection (PI) on confinement time in the TJ-II plasmas ||López-Miranda, Belén||CIEMAT||Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT), Teresa Estrada (CIEMAT), Josep María Fontdecaba (CIEMAT), Raúl García (CIEMAT), Isabel García-Cortés (CIEMAT), Julio Hernández-Sánchez (CIEMAT), Daniel Medina (CIEMAT), Kieran Joseph McCarthy (CIEMAT), Jaime de la Riva (CIEMAT).||The aim of this experiment is to study the confinement time after PI & LBO impurities into ECRH TJ-II plasmas. This is of interest since PI causes transient changes in plasma kinetic profiles, Er and turbulence. A large PI into an on-axis ECRH leads to a collapse with rapid energy losses and plasma termination. Radiative cooling due to impurities affects the energy, and Te decays. We try to study the isotope effect in transport due to LBO injection inmediately after D or H PI in H/D plasmas.
|-
| Study of the isotope effect into fast-ion losses in NBI-heated plasmas in the TJ-II stellarator.||López-Miranda, Belén ||CIEMAT||Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT), Álvaro Cappa (CIEMAT), Andrés Bustos (CIEMAT), Juan Fraguas (CIEMAT), David Jiménez-Rey (CIEMAT), José Luis Velasco (CIEMAT), Pedro Pons-Vilallonga (CIEMAT), Arturo Alonso (CIEMAT), Claudia Salcuni (University of Trieste), Teresa Estrada (CIEMAT), Josep María Fontdecaba (CIEMAT), Raúl García (CIEMAT), Jaime de la Riva (CIEMAT)||In MCF, FI are a source of particles and free energy that drive various unstable MHD instabilities that degrade fusion performance. Then, the power transferred to the main plasma decreases and its heating efficiency drops. FI losses depend on many factors, such as the working gas, energy, mass, source, pitch angle and charge of the ion, etc. Thus, experimental studies and theoretical validations of FI losses are required to understand the behaviour of fast particles in stellarators
|-
| Commissioning of Pellet Injector for Deuterium Pellets||Kieran McCarthy||Ciemat||Isabel García, Nerea Panadero||Hydrogen pellets have been injected into ECRH and NBI plasmas since 2014. With these, a large pellet database has been created for TJ-II. This has enabled investigation of pellet ablation, plasmoid drift, pellet deposition, fuelling efficiency, etc. Plasmoid drift, pellet particle deposition and efficiency should be isotope sensitive. It is intended to extent the TJ-II database to both D2 pellets. For this, tests need to be performed to achieve reliable D2 pellet formation and acceleration.
|-
| The influence of pellet start-time and separation times on improved performance in TJ-II NBI heated plasmas||Kieran McCarthy||Ciemat||Isabel García||Cryogenic pellet injection causes a step-like increase in density and significant improvements in performance (diamagnetic energy & energy confinement) of NBI-heated TJ-II plasmas. Additional injections further improve this, however, the pellet sizes and separations between pellets can determine if such a phase is maintained or if operational boundaries are reached. Multiple injections with varied separations will be made to maximize such improvements and investigate these limits in TJ-II.
|-
| Study of pre- and post-pellet injection phases with a Langmuir probe on the TJ II stellarator||Ivanova, Pavlina||Institute of Electronics, Bulgarian Academy of Sciences||Miglena Dimitrova (Institute of Plasma Physics, Czech Academy of Sciences), Embie Hasan (Institute of Electronics, Bulgarian Academy of Sciences) , Elmira Vasileva (Institute of Electronics, Bulgarian Academy of Sciences)||Pellet injection (PI) is performed on the TJ-II for fuelling and impurity transport studies. When NBI heating is used, a PI can induce an enhanced confinement phase. Langmuir probes are frequently used for acquiring plasma parameters in the SOL of stellarators. Determining plasma parameters using electric probes in the pre- and post-PI phase under various experimental conditions (ECRH and NBI phases) can contribute to understand the physical processes and effects of pellets in the SOL.
|-
| Impurity-hole plasmas in TJ-II||Daniel Medina Roque||CIEMAT||J.L. Velasco (CIEMAT), I. García-Cortés (CIEMAT), K. McCarthy (CIEMAT), N. Tamura (NIFS), TJ-II Team||Achieve a positive Er in the outer plasma region and a negative one in the inner part to reproduce the plasma conditions in impurity-hole phenomenon in LHD. Then, inject the same impurities in the edge by Laser Blow-Off (LBO) and in the core by TESPEL and analyze if there are significant differences in transport and confinement times for inter-machine comparison. This is a continuation of http://fusionwiki.ciemat.es/wiki/TJ-II:Comparison_of_transport_of_on-axis_and_off-axis_ECH-heated_plasmas
|-
| Injection of low-Z elements for turbulence reduction and confinement improvement for comparison with W7-X and LHD.||Federico Nespoli||PPPL||D. Medina-Roque (CIEMAT), A. de Castro (CIEMAT), I. García-Cortés (CIEMAT), K. McCarthy (CIEMAT), N.Tamura (NIFS) ||It has been observed in LHD and W7-X that the injection of low-Z impurities can have beneficial effects on plasmas by stabilizing turbulence and thus improve confinement. If this effect overcomes the negative effect of lost plasma power due to strong radiation fluxes, which is normally the case for low-Z impurities, then low-Z injections can result in increments of ion temperature and plasma diamagnetic energy in TJ-II. The objective is to study this in TJ-II for inter-machine comparison.
|-
| TESPEL injections into the pellet-induced enhanced confinement phase of NBI plasmas to evaluate core impurity confinement during this phase||Daniel Medina-Roque ||CIEMAT||K. McCarthy (CIEMAT), I. García-Cortés (CIEMAT), N. Tamura (NIFS), B. López-Miranda (CIEMAT), F. Medina Yela (CIEMAT), AND TJ-II TEAM||An enhanced energy confinement phase is induced in NBI-heated plasma of TJ-II by pellet injection. It is considered that impurity confinement maybe enhanced also during this phase. TESPEL allows tracer deposition in the high-density core region of such enhanced plasmas. Thus, TESPEL (core) and LBO (edge) results can thus provide new insights on impurity accumulation. Our results can be of significant interest for evaluating impurity confinement during pellet-induced enhanced performance in W7-X.
|-
| Impurity confinement dependence on TJ-II plasma temperature gradient by injecting different Z tracers for comparison with LHD||N. Tamura||NIFS (Japan)||D. Medina-Roque (CIEMAT), Isabel García Cortés (CIEMAT), Kieran McCarthy (CIEMAT), Belén López Miranda (CIEMAT), Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), René Bussiahn (IPP Greifswald)||Experimental results from the 24th LHD experimental campaign show a strong impact of ECRH deposition radial location on impurity confinement for a wide range of Z. Reduced peaking of Te profiles can result in significantly longer impurity confinement times and stronger degradation of plasma performance for high-Z elements. The goal of this experiment is to study the dependency of impurity confinement on target electron temperature gradient by repeating experiments already performed in LHD.
|-
| Checking the alignment of ECRH beams using power modulation||Cappa, Álvaro||LNF-CIEMAT||Martínez, José||Measure the power deposition profiles of both launched beam (ECH1 & ECH2) by means of fast power modulation (fmod>3 kHZ) aiming at detect possible misalignments.
|-
| Characterization of energy transport in TJ-II: Dependence on thermodynamic gradients and link to turbulence measurements.||Carralero, Daniel||CIEMAT|| A. Alonso (CIEMAT), A. Baciero (CIEMAT), A. Cappa (CIEMAT), T. Estrada (CIEMAT), J. M. García-Regaña, O. Kozachek, B. López-Miranda (CIEMAT), J. Martinez (CIEMAT), K. McCarthy (CIEMAT), E. Sánchez, I. Pastor (CIEMAT), H. Thienpondt (CIEMAT), J.L. Velasco (CIEMAT).||The objective of this proposal is to carry out a characterization of the profiles of ion and electron heat fluxes in order to obtain the turbulent transport coefficients and their dependence on local gradients, to be compared to local measurements of fluctuation amplitudes (HIBP, DR) and turbulent transport (HIBP). Besides providing a complete descripion of transport in TJ-II, these measurements will allow a detailed validation of turbulent transport predictions carried with gyrokinetic codes.
|-
| Characterization and modelling of the parallel dynamics of impurity ions with parallel and anti-parallel collinear NBI injection||Jaime de la Riva||CIEMAT||Arturo Alonso, Kieran Maccarthy||Here we propose to study the transmission of momentum to the plasma produced by the injection of neutral particles and other possible effects on the flow of impurities produced by the NBI. Parallel experiments have been proposed in W7-X OP2.1 and LHD 24th and 25 campaign.
|-
| NBI1 vs. NBI2 heated plasma comparison: impact of radial electric field and turbulence on impurity concentration and plasma performance||Estrada, Teresa||CIEMAT||A. Baciero, A. Cappa, B. López-Miranda, K. McCarthy, F. Medina, I. Pastor, J. de la Riva, J.L. Velasco ||NBI plasmas show differences that depend on injection direction, co- or counter-injection. Whereas the evolution of ne profiles is alike for both, Te, Zeff, Er and density turbulence profiles evolve differently, resulting in higher density limit and higher energy content for ctr-NBI. Experimental beam characterizations indicate that both present similar re-ionization losses & transmissions, while ASCOT simulations show more direct ion losses for co-NBI and slightly better efficiency for ctr-NBI.
|-
| Study on impurity content, radiative collapses and turbulence characterization in the vicinity of density limit in TJ-II ||Salcuni Claudia||CIEMAT||Arturo Alonso (CIEMAT), Nerea Panadero (CIEMAT), Belén López-Miranda (CIEMAT),A. Baciero (CIEMAT), F. Medina (CIEMAT), I. Pastor (CIEMAT), T. Estrada (CIEMAT), J. M. Fontdecaba (CIEMAT), I. García-Cortés (CIEMAT), R. García (CIEMAT), J. Hernández-Sánchez (CIEMAT), D. Medina-Roque (CIEMAT), k. J. McCarthy (CIEMAT), J. De la Riva (CIEMAT)||"The main objective of this proposal is to assess density ramps profiles scanning magnetic field configurations, then analyze the impurity content and see which impurity species affects the most the power radiated inside the plasma. Hence, choose a correct operational density limit as well as specific magnetic field configuration and characterize turbulence properties in the vicinity of the operational density limit."
|-
| Combining retarding-field energy analyzer and electrostatic probes measurements, an approach to measure the phase relation between density and temperature fluctuations using RFA||Nedzelskiy, Igor||IPFN||Carlos Silva (IPFN), Igor Voldiner (CIEMAT)||Physics behind uncoupled transport channels is a relevant open question for understanding both ELM control techniques (e.g. using RMP) as part of the ITER base-line scenario and the development of plasma scenarios without ELMs (e.g. I-mode). Transport channel decoupling could be driven by any mechanism that leads to a modification of the cross-phase between density and temperature fluctuations caused by changing driving conditions.
|-
| Commissioning Analyzer B, HIBP2||José Luis de Pablos||LNF-Ciemat||Oleksandr Kozachok, Oleksandr Chmyga, Isabel García Cortes, B. van Milligen||HIBPs allows to measure the plasma potential and Er profiles and density fluctuations and coherence between them. The addition of new TREKs HV amplifiers allow to control independently the HIBP-B and HIBP2-A and increase the total current of the beam to allow better SNR. This could help in the measurement of Medium-Range Correlation plasma potential important for the experiment "Turbulence characterization of pellet-induced enhanced confinement phase at TJII" leaded by Isabel García.
|-
| External control of Zonal Flows ||Jose Luis de Pablos||LNF-Ciemat||B.P. van Milligen (LNF-Ciemat), J.M. Barcala (Dpto Tecnología-Ciemat), A. Molinero (Dpto Tenologia-Ciemat), O. Kozachok (IPP-NSC KIPT), O. Chmyga (IPP-NSC KIPT), J. Romero (TAE), I. García-Cortes (LNF-Ciemat), C. Hidalgo(LNF-Ciemat)||Zonal flows are of fundamental importance for confinement in magnetically confined plasmas, as evidenced by the well-known H-mode, produced by a transport barrier in the edge of the plasma.The present proposal investigates the possibility of actively stimulating the development of such low-frequency zonal flows through feedback.
|-
| Particle and energy propagation with edge plasma polarization||Xiao, Chijin||University of Saskatchewan, Canada||Voldiner, Igor (CIEMAT)||The main objective of the proposal is to study the relationship between the particle/energy transport and the plasma velocity shear in the TJ-II stellarator. In addition to linear cross-correlation analyses, nonlinear cross-correlation analysis will be used to study the strength and direction of energy transport (ref: Phys. Rev. Lett. 79, 2458 (1997) - Nonlinear Radial Correlation of Electrostatic Fluctuations in the STOR-M Tokamak (aps.org)).
|-
| Assessment of the impact of background hydrogen isotope on impurity behaviour in TJ-II||Daniel Medina Roque||CIEMAT||Isabel García Cortés (CIEMAT), Kieran McCarthy (CIEMAT), Belén López Miranda (CIEMAT), Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Naoki Tamura (NIFS), René Bussiahn (IPP Greifswald)||Experimental results in the LHD have shown that deuterium plasmas have better impurity confinement than hydrogen plasmas. TESPEL and LBO impurity injections will be performed into H2 and D2 plasmas with similar electron densities and temperatures in CERC and CIRC. This comparison between CERC and CIRC is very interesting because the sign of the radial electric field affects the sign of the convection velocity coefficient of the impurity transport and thus the impurity confinement time.
|-
|}

== Experimental proposals, Spring 2023 ==

Creation date: 20/03/2023 08:45. Please do no edit this table.

[[Media:Minutes_Meeting_of_the_Access_Committee_March_28_2023.pdf| Minutes]] of the TJ-II Access Committee Meeting, March 28, 2023 .

{| class="wikitable"
! Title !! Main proponent !! Main proponent's affiliation !! Other proponents !! Specific objectives of the experiment
|-
| Injection of cryogenic pellets in TJ-II operated with an inverted magnetic field || McCarthy, Kieran Joseph || Ciemat || García Cortés, Isabel || When a pellet is injected, it is ablated by plasma and clouds that detach from it should drift down the B-field gradient. In tokamaks, drifting facilitates efficient pellet fuelling for high-field side injection. However, in helical devices, the effect of such drifting is not clear. Thus, the inversion of the TJ-II B field provides a unique opportunity to compare cloud drifting and particle deposition in a helical device. No differences are expected but this needs experimental confirmation.
|-
| Rational surfaces, flows and radial structure in the TJ-II stellarator: Part II || van Milligen, Boudewijn || CIEMAT || Igor Voldiner (CIEMAT), Benjamin Carreras (UC3M) || We will expand the iota scan of Day 17/03/2022, reported in B.Ph.van Milligen et al., Plasma Phys. Control. Fusion 64 (2023), p. 055006. It revealed an interesting pattern of the poloidal flow velocity, v_theta, linked to low order rational surfaces. Using turbulence modelling, this pattern was shown to be due, likely, to the formation of a staircase pattern in the profiles. By expanding the scan range, here we will study the effect of several major rational surfaces (3/2, 8/5, 5/3).
|-
| Continuation of studies of pellet plasmoid drift in different magnetic configurations || Panadero, Nerea || CIEMAT || Kieran McCarthy (CIEMAT), Julio Hernández-Sánchez (CIEMAT), Isabel García-Cortés (CIEMAT), Daniel Medina-Roque (CIEMAT) || The main objective of this proposal is to quantify pellet plasmoid drift in the early stages of the homogenization process, and its relationship with rational surfaces for magnetic configurations with an iota profile lower than the standard configuration. In addition, experimental results will be compared with HPI2 predictions, since these experiments will be also part of the current effort to evaluate the stellarator version of HPI2 for the TJ-II, W7-X, LHD and Heliotron-J devices.
|-
| Spectroscopic Gas Puff Imaging (SGPI) for edge plasma characterisation || de la Cal, Eduardo || CIEMAT || Igor Voldiner (CIEMAT), Boudewijn van Milligen (CIEMAT) || Characterise the edge plasma boundary with the new SGPI system, with focus on 2-dimensional (2D) imaging of electron density (ne) and temperature (Te) turbulence and its coupling to neutrals.The SGPI diagnostic has shown in the last campaign the ability to obtain 2D measurements of the edge plasma ne and Te with a spatial resolution of , 4 mm and exposure times down to 10 microseconds.
|-
| Studying fast-ion losses induced by Alfvén Eigenmodes in NBI heated plasmas of the stellarator TJ-II || López-Miranda, Belén || CIEMAT || Baciero, Alfonso; Cappa, Álvaro; Medina, Francisco; Pons-Villalonga, Pedro || In magnetic confinement fusion, fast-ions constitute a source of particles and free energy that, under certain conditions, drive various unstable MHD instabilities that significantly degrade fusion performance. In particular, the study of the impact of Alfvén Eigenmodes (AEs) is of special importance for controlling fast-ion transport across the magnetic field. The present experiment aims to study the influence of fast-ion losses induced by AEs in pure NBI-heated & combined ECR and NBI plasmas.
|-
| Impact of the rotational transform on pellet-induced enhanced performance in the TJ-II stellarator || Carreras, Benjamin || UC3M || Isabel García Cortés (CIEMAT), Kieran McCarthy (CIEMAT), Boudewijn van Milligen (CIEMAT) || In recent work, we observed pellet-induced enhanced confinement at the TJ-II stellarator [reference]. Analysis suggest that this enhancement could be related to the formation of transport barriers associated with low-order rational surfaces. Using the C-mode, i.e., the continuous variation of the rotational transform, we intend to shed further light on this issue.
|-
| External control of ZF in the TJ-II stellarator || De Pablos, José Luis || LNF || B.P. van Milligen, J.M. Barcala, A. Molinero, O. Kozachok (KIPT), O. Chmyga(KIPT), J. Romero (TAE), C. Hidalgo || The present proposal investigates the possibility of actively stimulating and control the development of low-frequency zonal flows through feedback.
|-
| Plasma Characterisation with Deuterium pellet injection || Isabel García Cortés || CIEMAT || Kieran McCarthy (CIEMAT), Daniel Medina-Roque (CIEMAT), Nerea Panadero (CIEMAT) || "Enhanced confinement is seen in TJ-II NBI-heated plasmas after single H pellet injection. In addition to the expected rise of core electron density, the plasma diamagnetic energy content rises by up to 40% with respect to similar discharges without PI. Enhancement is larger (up to 70%) when multi-pellets are used. To date, only H pellets into hydrogen plasmas have been studied. Our proposal is to inject deuterium pellets into deuterium plasmas to explore the isotope effect on this PiEC phase.
|-
| Recommissioning of the CXRS/MSE systems || McCarthy, Kieran Joseph || Ciemat || Jaime de la Riva Villen (Ciemat), Isabel García Cortés (Ciemat) || TJ-II is equipped with a compact NBI for performing CXRS and MSE. The NBI has been non-operative for several years due to a vacuum leak. The leak has been located and repaired. It is intended to recommission the CXRS diagnostic during this campaign. CXRS allows obtaining radial measurements of ion temperature, ion toroidal and poloidal velocity and radial electric field. Once operational, it will be used to measure these parameters during the PiEC phases achieved after pellet injection.
|-
| TJ-II: Calibration of the helical arrays of Mirnov coils || Pons-Villalonga, Pedro || CIEMAT || Álvaro Cappa (CIEMAT) || Calibration of the arrays of Mirnov coils, which is essential to correctly determine the mode numbers of the MHD perturbations.
|-
| NBI1 vs. NBI2 heated plasma comparison under reversed field conditions || Estrada, Teresa || CIEMAT || Arturo Alonso (CIEMAT), Alvaro Cappa (CIEMAT), Belen Lopez-Miranda (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT), Jose Luis Velasco (CIEMAT), NBI team. || A systematic comparison of plasmas heated with co- or ctr-NBI shows differences in the maximum achievable density and stored energy; lower values are generally achieved in co-NBI heated plasmas associated to higher impurity accumulation. A more intense negative Er and a reduction in the turbulence are measured in co-NBI heated plasmas as compared to counter- NBI cases. The interpretation of the experimental observations would benefit from experiments carried out under reversed field conditions.
|-
| Internal density measurements of plasmoid in hydrogen pellet || Gen Motojima || National Institute for Fusion Science (NIFS) || Nerea Panadero, Kieran McCarthy, Shinichiro Kado(Kyoto Univ.) || The objective is to evaluate the plasmoid density in hydrogen pellet to understand the pellet ablation. The measurement of plasmoid density has been conducted in LHD and Heliotron J, there is a difference of plasmoid density in them probably due to the difference of background plasma parameters. If the plasmoid density is evaluated also in TJ-II, it must help the understanding of mechanism of pellet ablation.
|-
| Impurity hole plasmas in TJ-II || Daniel Medina Roque || CIEMAT || Jose Luis Velasco (CIEMAT), Kieran McCarthy (CIEMAT), Isabel García-Cortés (CIEMAT), Álvaro Cappa (CIEMAT), Belén López-Miranda (CIEMAT), Alfonso Baciero (CIEMAT), Francisco Medina (CIEMAT), Teresa Estrada (CIEMAT), Daniel Carralero (CIEMAT), Emmanouil Maragkoudakis (CIEMAT) || Achieve a positive radial electric field (Er) in the outer plasma region and a negative one in the inner part to reproduce the plasma conditions in the impurity-hole phenomenon in LHD. Then inject the same impurities in the edge by Laser Blow-Off (LBO) and in the core by TESPEL and analyze if there are significant differences in their transport and confinement time. This is a continuation of http://fusionwiki.ciemat.es/wiki/TJ-II:Comparison_of_transport_of_on-axis_and_off-axis_ECH-heated_plasmas
|-
| Flux suppression via turbulence amplitude and cross phase across radial electric field variation || Tatsuya, Kobayashi || NIFS || || Anomalous cross-field transport suppression by radial electric field in torus plasmas is one of central research topics in fusion plasma physics. A prototypical example is the low-to-high confinement mode transition (L-H transition) triggered under a certain level of plasma heat input. In this experiment, we investigate how the turbulent transport is suppressed via the turbulence amplitude suppression and modification of cross phase between potential and density fluctuations.
|-
| Continuation of Imaging of pellet cloud dynamics observations in TJ-II using Halpha and bremsstrahlung filters and a fast-frame camera || Gabor Kocsis || Centre for Energy Research || Tamás Szepsi (Centre for Energy Research), Nerea Panadero (CIEMAT), Kieran McCarthy (CIEMAT), Julio Hernández-Sánchez (CIEMAT) || The aim of this proposal is to study the interaction of hydrogen and impurity pellets (TESPELs) with the stellarator plasma by evaluating fast-framing video data. Similar experiments have already been performed at TJ-II, in which drifting pellet clouds were observed. However, for hydrogen pellets, it was hard to recognize single clouds. Therefore, experiments with higher temporal resolution, in several scenarios and magnetic configurations, also using different optical filters, are now proposed.
|-
| Neutral beam current drive in reversed field configuration || Álvaro Cappa || CIEMAT || José Luis Velasco, J. Martínez || The goal of the experiment is to measure the amplitude of toroidal current driven by both NBIs in reversed field configuration and compare with the results obtained in the standard conditions.
|-
| The pulsed ECRH wall conditioning scenario for W7-X || Moiseenko, Vladimir || Division of Electricity, Angstrom Laboratory, Uppsala University, Uppsala, Sweden || Yurii Kovtun (KIPT), Andrei Goriaev (FZJ), Dirk Naujoks (IPP), Torsten Stange (IPP), Chandra-Prakash Dhard (IPP), Heinrich Laqua (IPP) || The main goal of the research proposed includes the study of the physical properties of pulsed ECRH wall conditioning discharges, their optimization, usage, and the wall conditioning process caused by them. The optimization studies aiming to shorten the plasma decay stage which gives an opportunity to decrease the time period between shots. Based on these studies, a scenario for wall conditioning at Wendelstein 7-X will be developed.
|-
| Optimisation of fast-ion confinement TJ-II plasmas || Garcia-Munoz, Manuel || University of Seville || Galdon-Quiroga (University of Seville), Van Vuuren (University of Seville), Viezzer (University of Seville), Gonzalez-Martin (University of Seville) || Optimisation of fast-ion confinement in TJ-II. Optimal TJ-II magnetic topology, kinetic profiles and NBI parameters for fast-ion confinement. AE control with localised ECRH / ECCD
|-
| Characterization and modelling of the parallel dynamics of impurity ions with and without continuous NBI injection. || Jaime de la Riva Villén || CIEMAT || Arturo Alonso, CIEMAT. Kieran Maccarthy || We propose to investigate the possible effect of NBI momentum injection on the net parallel velocity of the plasma ions and impurities analyzing measurements obtained by CXRS diagnostic. The net parallel velocity of the individual plasma species is a prediction of the neoclassical theory in non-symmetric system. The combination of these parallel flow fields results in the so-called bootstrap current, the accurate prediction of which is of importance in stellarator concepts.
|-
| CXRS flow measurements: Density and ECRH scan || Jaime de la Riva Villén || CIEMAT || Arturo Alonso, CIEMAT. Kieran Maccarthy, CIEMAT || The objective is to study trends in radial electric field and net parallel velocity profiles in different plasma conditions and magnetic configurations and comparing it with neoclassical expectations. The dependency on the line integrated density, the ECRH power and the magnetic configuration of the flow measurements will be analyzed.
|-
| New mechanisms for shear production? || DIF-PRADALIER Guilhem || CEA/IRFM || SARAZIN Yanick (CEA/IRFM) || Zonal flows (ZF) are ubiquitous and play a central role in the regulation of transport in tokamaks, stellarators and RFPs. It is commonly agreed that turbulent Reynolds stresses, product of ExB flow fluctuations is the main drive for ZF production. This has been questioned experimentally [1]. Theoretically and computationally [2,3] a diamagnetic contribution to ZF production has been evidenced, product of ExB and diamagnetic fluctuations. Experimentally testing this mechanism would be a first.
|-
| Exploring basic mechanisms for the density limit || DIF-PRADALIER Guilhem || CEA/IRFM || SARAZIN Yanick (CEA/IRFM) || Density limits ubiquitously appear in tokamaks, stellarators and RFPs. Competing mechanisms have been proposed, ranging from MHD/radiative cooling [1] and radiation collapse [2] to transport scenarios: linear changes in dominant edge mode [3] or collapse of the edge shear layer consecutive to depletion of the zonal flow (ZF) drive [4,5]. Testing these scenarios within the same experiments, with special emphasis on aspects of the latter shear collapse scenario is timely and of broad significance.
|-
| Combining retarding-field energy analyzer and electrostatic probes measurements, an approach to measure the phase relation between density and temperature fluctuations using RFA || Igor Nedzelskiy || IPFN || Carlos Silva (IPFN), Igor Voldiner (Ciemat), HIBP team || Physics behind uncoupled transport channels is a relevant open question for understanding both ELM control techniques (e.g. using RMP) as part of the ITER base-line scenario and the development of plasma scenarios without ELMs (e.g. I-mode). Transport channel decoupling could be driven by any mechanism that leads to a modification of the cross-phase between density and temperature fluctuations caused by changing driving conditions..
|-
| Assessment of the impact of background hydrogen isotope on the impurity behavior in TJ-II || Naoki Tamura || NIFS || Daniel Medina Roque (CIEMAT), Isabel García-Cortés (CIEMAT), Kieran McCarthy (CIEMAT) || Experimental results in LHD have shown that deuterium plasmas have better impurity confinement compared to hydrogen plasmas. Thus, TESPEL and LBO impurity injections will be performed into hydrogen and deuterium plasmas with similar electron density and temperature to assess the isotope effect of background hydrogen on the impurity behavior in TJ-II.
|-
| Continuation of studies of impurity injection by LBO technique with fast camera images || López-Miranda, Belén || CIEMAT || Panadero, Nerea; Baciero, A.; Estrada, T.; García-Regaña, J. M.; McCarthy, K. J.; Medina, D.; Medina, F., Ochando, M. A.; Pastor, I.; Velasco, J. L. || Near the transition to a Er>0, an increase in confinement time was observed. Here, we try to study the confinement time in ion-root regimes using LBO observing the transport process with fast camera images, continuing with previous works: http://fusionwiki.ciemat.es/wiki/TJ-II:_Impurity_injection_by_laser_blow-off_(LBO):_Confinement_and_transport_studies_of_high_Z_impurity_injection_by_LBO_in_ion-root_scenarios_(II)._Comparison_to_neoclassical_and_turbulence_simulations.
|-
| TESPEL injections in turbulence reduced plasmas via pellet injection || Daniel Medina Roque || CIEMAT || Isabel García-Cortés (CIEMAT), Kieran McCarthy (CIEMAT), Naoki Tamura (NIFS) || Characterize the impurity confinement with TESPEL and LBO injections in the transient turbulence reduction of Pellet Induced Enhanced Confinement plasmas to assess if impurities are confined for longer times and if the deposition location of the impurities play an important role.
|-
| Lithium hydride pellet injection in TJ-II plasmas || de Castro Calles, Alfonso || CIEMAT || || Lithium pellet/powder injection has shown to drive positive effects on confinement linked to the very low plasma contamination level and decreased hydrogen recycling on the boundary with an special influence on ELM pacing and suppression in devices like NSTX and EAST tokamaks. In TJ-II, lithium hydride LiH) is pretended to be used as a surrogate for lithium due to more simple manipulation and the easier pellet fabrication when compared to pure Li pellets
|-
| Assessment of impurity screening in TJ-II || Naoki Tamura || NIFS || Daniel Medina Roque (CIEMAT), Isabel García-Cortés (CIEMAT), Kieran McCarthy (CIEMAT) || In LHD impurity screening features have been observed in high-density plasmas leading to higher impurity confinement times for core-deposited impurities via TESPEL in contrast with lower values for impurities deposited in the edge by both gas puffing and LBO. A density scan will be performed and impurities will be deposited by the different methods into reproducible plasma discharges to compare the impurity confinement times in the different cases.
|-
| Divertor configurations in TJ-II: scenario development || Alonso, Arturo || CIEMAT || Eduardo de la Cal (CIEMAT), Daniel Carralero (CIEMAT), Marcos G. Barriopedro (UPM) || The objective of this proposal is to establish reliable operation scenarios for island divertor-like configurations in TJ-II. These configurations are based on the m=2 or m=4 edge island chain for configurations with edge iota close to 2 and could provide a means to explore ID SOL physics in TJ-II.
|-
| Characterization of energy transport in TJ-II: Dependence on thermodynamic gradients and link to turbulence measurements. || Carralero, Daniel || CIEMAT || A. Alonso (CIEMAT), A. Baciero (CIEMAT), A. Cappa (CIEMAT), T. Estrada (CIEMAT), J. M. García-Regaña, O. Kozachek, B. López-Miranda (CIEMAT), J. Martinez (CIEMAT), K. McCarthy (CIEMAT), E. Sánchez, I. Pastor (CIEMAT), H. Thienpondt (CIEMAT), J.L. Velasco (CIEMAT). || The objective of this proposal is to carry out a characterization of the profiles of ion and electron heat fluxes in order to obtain the turbulent transport coefficients and their dependence on local gradients, to be compared to local measurements of fluctuation amplitudes (HIBP, DR) and turbulent transport (HIBP). Besides providing a complete descripion of transport in TJ-II, these measurements will allow a detailed validation of turbulent transport predictions carried with gyrokinetic codes.
|-
| Plasma termination experiments using TESPELs || Tamura, Naoki || National Institute for Fusion Science || Kieran J. McCarthy (Ciemat), Isabel García-Cortés (Ciemat), Daniel Medina-Roque (Ciemat), Andreas Dinklage (IPP), Hjördis Bouvain (IPP), Thomas Wegner (IPP), René Bussiahn (IPP) || The main objective of this proposal is to study the mechanisms of plasma termination in response to a massive impurity (carbon and tungsten) injection. In addition, the impact of the heat deposition profile on the termination process is also a topic to be investigated. Therefore, the proposed experiments will be done in ECR-heated and NBI-heated plasmas. And to get some ideas regarding the isotope effect on such phenomena, the experiments will be performed in hydrogen and deuterium plasmas.
|-
| Impact of impurities on turbulent transport || García Regaña, José Manuel || CIEMAT || J. M. García-Regaña (CIEMAT), A. Alonso, A. Baciero, I. Calvo, D. Carralero, T. Estrada, A. González-Jerez, B. López-Miranda, K. McCarthy, D. Tafalla, H. Thienpondt … || Deliberate injection of impurities has been used to access high ion temperature (Ti) scenarios with los turbulence in LHD and to increase transiently Ti in W7-X. Moreover, gyrokinetic simulations have confirmed that impurities can reduce or enhance turbulent fluctuations and heat fluxes, depending on the sign of the impurity density gradient. The present proposal aims at characterizing the role that impurities have on turbulent transport and, consequently, on the performance of TJ-II.
|-
| Measurements of electron adiabaticity and comparisons with gyrokinetic simulations || Yanna, Kaitlyn || MIT || Arturo Alonso (CIEMAT) and others || The proposals aims at quantifying the phase difference between electron density and electrostatic potential fluctuations and the two-point Gamma-ExB flux in plasmas with varying values of local density gradient. This proposal's objective is to compare the HIBP measurements of the above-mentioned quantities with the gyrokinetic simulations by Thienpondt et al.
|-
| HIBP-based investigation of the properties of Alfvén Eigendmodes || Kozachok, Oleksandr || KIPT || Oleksandr Chmyga (KIPT), Álvaro Cappa (CIEMAT), Arturo Alonso (CIEMAT) || Continue the characterisation of the AE spatial-temporal dynamics of the density and potential oscillations (symmetry, particle flux). The medium term goal is to validate model predictions.
|}

== Experimental proposals, Spring 2022 ==
Deadline: January 24, 2022

[[:Category:TJ-II experimental proposals Spring 2022]]


'''Session allocation (February - March)''' ([[Media:Planning Spring2022A Endorsed V3.pdf| Feb 18]], Approved by the Access Committee on March 2, [[Media:20220302 Minutes TJ-II Access Committee.pdf| Minutes]]).

'''Session allocation (April - June)''' ([[Media:Planning Spring2022B Internal.pdf| April 6]], Approved by the Access Committee on April 8, [[Media:Minutes_Meeting_of_the_Access_Committee_April_8_2022.pdf| Minutes]]).

== Experimental proposals, Autumn 2021 ==
Deadline: October 1, 2021

[[:Category:TJ-II experimental proposals Autumn 2021]]


== Experimental proposals, Spring 2021 ==
Deadline: January 30, 2021

[[:Category:TJ-II experimental proposals Spring 2021]]


Resolution of the experimental proposals Autumn 2019 and Feb_2020

[[Media:TJII_Access_Committee_February_2021_v1.pdf|TJII_Access_Committee_February_2021_v1.pdf]]

== Experimental proposals, Spring 2020 ==
Deadline: January 23, 2020

[[:Category:TJ-II experimental proposals Spring 2020]]


Resolution of the experimental proposals Autumn 2019 and Feb_2020

[[Media:20191122 TJII Access Committee Nov2019 v1.pdf|20191122 TJII Access Committee Nov2019 v1.pdf]]

== Experimental proposals, Autumn 2019 ==
Deadline: October 15, 2019

[[:Category:TJ-II experimental proposals Autumn 2019]]


Resolution of the experimental proposals Autumn 2019

[[Media:20191122 TJII Access Committee Nov2019 v1.pdf|20191122 TJII Access Committee Nov2019 v1.pdf]]

== Experimental proposals, Spring 2019 ==
Deadline: January 29, 2019

[[:Category:TJ-II experimental proposals Spring 2019]]



Resolution of the experimental proposals Spring 2019

[[Media:20190301 TJII Access Committee Fe2019 final.pdf|20190301 TJII Access Committee Fe2019 final.pdf]]

== Experimental proposals, Autumn 2018 ==
Deadline: October 10, 2018

[[:Category:TJ-II experimental proposals Autumn 2018]]



Resolution of the experimental proposals Autumn 2018

[[Media:20181027 Plan TJII Nov Dec 2018 v6.pdf|20181027 Plan TJII Nov Dec 2018 v6.pdf]]

== Experimental proposals, Spring 2018 ==
Deadline: March 7, 2018

[[:Category:TJ-II experimental proposals Spring 2018]]


Resolution of the experimental proposals Spring 2018

[[Media:20180423 Plan TJII April June 2018 v11.pdf|20180423 Plan TJII April June 2018 v11.pdf]]

== Experimental proposals, Spring 2017 ==
Deadline: January 26, 2017

[[:Category:TJ-II experimental proposals 2017]]


Resolution of the experimental proposals Spring 2017

[[Media:20170206 Plan TJII Feb June 2017 v15.pdf|20170206 Plan TJII Feb June 2017 v15.pdf]]

== See also ==

* [[TJ-II:Experimental program]] (not yet in use)
* [http://intranet-fusion.ciemat.es/document-server/tj-ii-experimental-program/ Experimental programs for earlier years (2002-2017)] (Intranet, password required)
* A new proposal page is created on the basis of this [[TJ-II:Proposal template|Proposal template]]. You do not need to view or modify it. Note for administrators: at the end of the template, the category of the proposal is specified (e.g, 'Autumn 2018'), which will determine to which list of proposals the proposal belongs.

[[Category:TJ-II internal documents]]

TJ-II:Experimental proposals

2025-10-14T09:53:55Z

Admin: /* Experimental proposals, Spring 2017 */

[[File:TJII_model.jpg|400px|thumb|right|TJ-II Model]]

== Important documents ==

[[Media:TJ-II_experimental_session_report.ppt|Presentation template for pre- and post-session reporting]]

== Creation of a new proposal ==
To submit an experimental proposal, please use [https://forms.gle/aNHbrRyVjpQS7MJt7 this form].
The table below is updated manually by the campaign management.

== Experimental proposals, Spring 2024 ==

Creation date: 04/12/2023 10:21. Please do no edit this table. To submit a post-deadline proposal, please, use the link above.

[[Media:Minutes_of_the_Access_Committee_Meeting_Spring_2024.pdf| Minutes]] of the TJ-II Access Committee Meeting, January 23, 2023 .

{| class="wikitable"
! Title !! Main proponent !! Main proponent's affiliation !! Other proponents !! Specific objectives of the experiment
|-
| Impact of plasma current on L-H transitions at TJ-II||van Milligen, Boudewijn||CIEMAT||Teresa Estrada (CIEMAT), Isabel García-Cortés (CIEMAT), Benjamin Carreras (UC3M), Eduardo de la Cal (CIEMAT), Igor Voldiner (CIEMAT), Arturo Alonso (CIEMAT)||Recent work has clarified the important role of the net plasma current, Ip, in facilitating L-H confinement transitions. Draft: https://drive.google.com/file/d/1ca7hgen5--xt9yeYt0qhjMrMvgPEfAfP/view?usp=drive_link In the present study, we will verify this effect by systematically varying the plasma current using the external OH control coils.
|-
| Impact of rationals on Pellet Enhanced Confinement at TJ-II||García-Cortés, Isabel||CIEMAT||Kieran McCarthy (CIEMAT), Boudewijn van Milligen (CIEMAT), Benjamin Carreras (UC3M), Luis García (UC3M), Daniel Medina-Roque (CIEMAT) ||Pellet Enhanced Confinement [L. García, I. García-Cortés, B. Carreras, K. McCarthy, and B. van Milligen. The effect of pellet injection on turbulent transport in TJ-II. Phys. Plasmas, 30:092303, 2023] is expected to vary with the radial location of low order rational surfaces in the plasma edge. The radial location of these rational surfaces can be controlled by modifying the plasma current using the external OH control coils.
|-
| Spectroscopic Gas Puff Imaging edge plasma characterisation||de la Cal, Eduardo||LNF-CIEMAT||Voldiner Igor, van Milligen Boudewijn||1. Commissioning of the new camera and image intensifier. 2. Continue the characterization of the edge plasma ne and Te profiles with other diagnostics. 3. Vary the He injection rate to look for possible local perturbation in the plasma edge. 4. Optimize the camera and image intensifier settings (recording speed, exposure time, active sensor area, amplification voltage) together with the He rate level to maximize the recording speed and SNR.
|-
| Origin of SOL turbulence||Wu||Southwestern Institute of Physics||Patrick H. Diamond (University of California San Diego), Min Xu (Southwestern Institute of Physics), Carlos Hidalgo (CIEMAT)||
1. Understand the origin of SOL turbulence. According to Wu et al. 2023 NF, we consider edge turbulence spreading and local SOL interchange turbulence as the main origins of SOL turbulence. We quantify both mechanism and compare their contribution to the SOL turbulence.
2. Understand the impact of edge turbulence spreading on the SOL width. We try to clarify the relative contributions of turbulence spreading from the edge and local SOL production in determining the SOL widths.
|-
| Llight-impurity powder injection in TJ-II plasma edge||Alfonso de Castro Calles||CIEMAT||Kieran McCarthy (CIEMAT), Federico Nespoli (PPPL), Naoki Tamura (LHD)||This proposal will study the effect of injecting light impurity species, in the form of powder, in the TJ-II plasma edge region. Similar experiments were performed in the last campaign using lithium hydride powder and a positive effect on plasma confinement was found. Such effects were observed in other devices (LHD) using boron powder and complex physics questions related to amelioration of turbulent energy transport and real time wall conditioning effects were claimed to play a main role.
|-
| Turbulence characterization of pellet-induced enhanced confinement phase at TJII||Isabel García-Cortés||CIEMAT||K. McCarthy (CIEMAT), T. Estrada (CIEMAT, B. van Milligen (CIEMAT), HIBP group (CIEMAT, Institute of Plasma Physics, National Science Center Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine) and TJ-II Team||In TJ-II, cryogenic pellet fuelling is seen to induce bifurcation-like transitions to improved performance in terms of stored energy, energy confinement and fusion triple product, this being better than gas-puff scenarios for similar densities. However, understanding of the full underlying physics of such a high performance is unknown. A broad full characterization of this phase is needed. The wide range of TJ-II diagnostics can help study this, in particular, turbulence levels and properties.
|-
| Investigation of pellet cloud dynamics in TJ-II in the presence of magnetic island using fast-framing video observation||Kocsis, Gabor||Centre for Energy Research||Tamás Szepesi (Centre for Energy Research), Nerea Panadero (CIEMAT), Kieran McCarthy (CIEMAT), Julio Hernández-Sánchez (CIEMAT)||The aim is to study the interaction of H pellets and TESPELs with the plasma by evaluating fast-framing video data. Similar experiments have already been performed at TJ-II, in which drifting clouds were observed both with H and VB filters with time resolution up to 700 kHz. Last experiments indicated that magnetic islands can change the cloud drift, suppressing it. Thus, we propose to investigate this by varying the island location and size through which we shoot both H pellets and TESPEL.
|-
| Internal density measurements of plasmoid in hydrogen pellet||Motojima., Gen||NIFS||N. Panadero (CIEMAT), K. J. McCarthy (CIEMAT), S. Kado (Kyoto University)||The objective is to evaluate the plasmoid density of hydrogen pellets to understand the ablation. Measurement of plasmoid density has been conducted in LHD and Heliotron J. There is a difference between them, probably due to the difference in background plasma parameters. If the plasmoid density is also evaluated in TJ-II, it should help to understand the mechanism of pellet ablation. We have obtained initial data from previous experiments and would like to extend it in the current experiment.
|-
| Investigation of the impact of the fast-ion losses induced by pellet injection on the density limit in TJ-II plasmas ||López-Miranda, Belén||CIEMAT||Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT), Álvaro Cappa (CIEMAT), Andrés Bustos (CIEMAT), Juan Fraguas (CIEMAT), David Jiménez-Rey (CIEMAT), José Luis Velasco (CIEMAT), Pedro Pons-Vilallonga (CIEMAT), Arturo Alonso (CIEMAT), Claudia Salcuni (University of Trieste), Teresa Estrada (CIEMAT), Josep María Fontdecaba (CIEMAT), Raúl García (CIEMAT), Isabel García-Cortés (CIEMAT), Julio Hernández-Sánchez (CIEMAT), Daniel Medina (CIEMAT), Kieran Joseph McCarthy (CIEMAT), Jaime de la Riva (CIEMAT)||Stellarator plasmas can collapse prematurely, this is a challenge in reactor development, so methods are required to overcome the density limit (DL). The aim of this work is to study the impact on the DL of fast-ion (FI) losses after cryogenic pellet in the TJ-II. The injection of pellets contributes to increase the density above the Sudo limit and modifies the radial density profile, and FI losses affect plasma performance. The DL should be defined considering the role of these FI.
|-
| Commissioning of fast camera for LBO diagnostic||Panadero, Nerea||CIEMAT||B. López-Miranda (CIEMAT), J. Hernández-Sánchez (CIEMAT), E. de la Cal (CIEMAT), A. Baciero (CIEMAT), F. Medina (CIEMAT), I. Pastor (CIEMAT), R. García (CIEMAT)||In the last campaign, we tried to install the fast cameroa to determine the penetration of LBO impurities. However, the preliminary results were not entirely satisfactory. For this reason, thorough alignment, focusing and recordings of impurities injected into the plasma are required prior to the experimental sessions.
|-
| Commissioning of the spectral scanning system ||López-Miranda, Belén ||CIEMAT||Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Raúl García-Gómez (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT)||During previous campaigns we employed the spectral scanning system in order to determine the Zeff of the plasma. However, the small signal obtained with the system required an improvement, by decreasing the spectral rotating mirror speed. Fort his reason, an upgrade is performed reducing this speed.
|-
| Commissioning of the new fast camera for spectroscopic gas puff imaging (SGPI) and pellet injection (PI)||Panadero, Nerea||CIEMAT||E de Cal (CIEMAT), Igor Voldiner (CIEMAT), R. García (CIEMAT), J. Hernández-Sánchez (CIEMAT)||A new fast camera (Photron Fastcam Nova S20) is now available for SGPI or PI experiments. It far exceeds current cameras capabilities, with megapixel recording speeds of up to 20 kfps with a texp, min = 0.2 μsm and max recording speed of 1 Mfps at reduced resolutions. After installation and out-of-window focusing, He and PI recordings in the plasma are required before the experimental sessions.
|-
| AEs model validation: measuring iota profile in NBI plasmas ||Cappa, Álvaro||LNF-CIEMAT||K. McCarthy (CIEMAT), N. Panadero (CIEMAT), P. Pons-Villalonga (CIEMAT), O. Kozachok (CIEMAT) and TJ-II Team||The goal is to have MSE measurements in NBI plasmas exhibiting AEs activity. We expect this measurement to clarify one of the main uncertainties when AEs model validation is attempted.
|-
| Investigation of the impact of LBO impurity injection immediately after cryogenic hydrogen pellet injection (PI) on confinement time in the TJ-II plasmas ||López-Miranda, Belén ||CIEMAT||Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT), Teresa Estrada (CIEMAT), Josep María Fontdecaba (CIEMAT), Raúl García (CIEMAT), Isabel García-Cortés (CIEMAT), Julio Hernández-Sánchez (CIEMAT), Daniel Medina (CIEMAT), Kieran Joseph McCarthy (CIEMAT), Jaime de la Riva (CIEMAT)||The aim of this experiment is to study the confinement time after PI & LBO impurities into ECRH TJ-II. This is of interest since PI causes transient changes in plasma kinetic profiles, Er and turbulence. A large PI into an on-axis ECRH discharge leads to a collapse with rapid energy losses and plasma termination. In addition, radiative cooling due to impurities affects the energy, and Te decays. We intend to investigate how impurity injection by LBO immediately after PI affects transport.
|-
| Investigation of the impact of impurity and cryogenic hydrogen pellet injection on the density limit in TJ-II plasmas||Panadero, Nerea||CIEMAT||B. López-Miranda (CIEMAT), A. Baciero (CIEMAT), F. Medina (CIEMAT), I. Pastor (CIEMAT), A. Alonso (CIEMAT), C. Salcuni (University of Trieste), T. Estrada (CIEMAT), J. M. Fontdecaba (CIEMAT), I. García-Cortés (CIEMAT), R. García (CIEMAT), J. Hernández-Sánchez (CIEMAT), D. Medina-Roque (CIEMAT), k. J. McCarthy (CIEMAT), J. De la Riva (CIEMAT)||Stellarator plasmas can collapse prematurely, this is a challenge in reactor development, so methods are required to overcome DL. Here we study this DL in the TJ-II and its dependence on pellets & LBO injections. H PI can modify the radial profile & improve plasma performance. It can also increase ne above the Sudo limit. Since radiation losses scale with the square of the ne, and heavy impurities cool the plasma, the DL should be defined by the radiation from the plasma edge light impurities.
|-
| Investigation of the impact of impurity and cryogenic deuterium pellet injection on the density limit in TJ-II plasmas||Panadero, Nerea||CIEMAT||B. López-Miranda (CIEMAT), A. Baciero (CIEMAT), F. Medina (CIEMAT), I. Pastor (CIEMAT), A. Alonso (CIEMAT), C. Salcuni (University of Trieste), T. Estrada (CIEMAT), J. M. Fontdecaba (CIEMAT), I. García-Cortés (CIEMAT), R. García (CIEMAT), J. Hernández-Sánchez (CIEMAT), D. Medina-Roque (CIEMAT), k. J. McCarthy (CIEMAT), J. De la Riva (CIEMAT)||Stellarator plasmas can collapse prematurely, this is a challenge in reactor development, so methods are required to overcome DL. Here we study this DL in the TJ-II and its dependence on pellets & LBO injections. D PI can modify the radial profile & improve plasma performance. It can also increase ne above the Sudo limit. Since radiation losses scale with the square of the ne, and heavy impurities cool the plasma, the DL should be defined by the radiation from the plasma edge light impurities.
|-
| Investigation of the impact of LBO impurity injection immediately after cryogenic hydrogen pellet injection (PI) on confinement time in the TJ-II plasmas ||López-Miranda, Belén||CIEMAT||Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT), Teresa Estrada (CIEMAT), Josep María Fontdecaba (CIEMAT), Raúl García (CIEMAT), Isabel García-Cortés (CIEMAT), Julio Hernández-Sánchez (CIEMAT), Daniel Medina (CIEMAT), Kieran Joseph McCarthy (CIEMAT), Jaime de la Riva (CIEMAT)||The aim of this experiment is to study the confinement time after PI & LBO impurities into ECRH TJ-II plasmas. This is of interest since PI causes transient changes in plasma kinetic profiles, Er and turbulence. A large PI into an on-axis ECRH leads to a collapse with rapid energy losses and plasma termination. Radiative cooling due to impurities affects the energy, and Te decays. We try to study the isotope effect in transport due to LBO injection inmediately after D or H PI in H/D plasmas.
|-
| Isotope effect on pellet-induced enhanced confinement in TJ-II||I. García-Cortés||I. Gracía-Cortés (CIEMAT)||K. McCarthy (CIEMAT), T. Estrada (CIEMAT, D. Medina-Roque (CIEMAT), N. Panadero (CIEMAT), HIBP group (CIEMAT, Institute of Plasma Physics, National Science Center Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine) and TJ-II Team||High-performance plasma scenarios are achieved in NBI-heated TJ-II discharges after pellet train injections. In addition to increased density, plasma diamagnetic energy rises with respect to reference discharges by up to 70%. To date, only H2 pellets have been injected into hydrogen plasmas. However, isotope effects are critical issues for future reactor operation. We propose to use different H/D pellet/plasma combinations to extent further the current TJ-II pellet and PiEC database
|-
| Continuation of studies of hydrogen pellet plasmoid drift in different magnetic configurations||Panadero, Nerea||CIEMAT||K. J. McCarthy (CIEMAT), B. López-Miranda (CIEMAT), K. J. McCarthy (CIEMAT), A. Baciero (CIEMAT), F. Medina (CIEMAT), I. Pastor (CIEMAT), J. M. Fontdecaba (CIEMAT), I. García-Cortés (CIEMAT), R. García (CIEMAT), J. Hernández-Sánchez (CIEMAT), D. Medina-Roque (CIEMAT), J. De la Riva (CIEMAT)||The main objective of this proposal is to quantify pellet plasmoid drift in the early stages of the homogenization process, and its relationship with rational surfaces for magnetic configurations with an iota profile lower than the standard configuration. In addition, experimental results will be compared with HPI2 predictions, since these experiments will be also part of the current effort to evaluate the stellarator version of HPI2 for the TJ-II, W7-X, LHD and Heliotron J devices.
|-
| Study of the influence of fast-ion losses induced by AEs in pure NBI-heated & combined ECR and NBI plasmas.||López-miranda, Belén||CIEMAT||Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT), Álvaro Cappa (CIEMAT), Andrés Bustos (CIEMAT), Juan Fraguas (CIEMAT), David Jiménez-Rey (CIEMAT), José Luis Velasco (CIEMAT), Pedro Pons-Vilallonga (CIEMAT), Arturo Alonso (CIEMAT), Claudia Salcuni (University of Trieste), Teresa Estrada (CIEMAT), Josep María Fontdecaba (CIEMAT), Raúl García (CIEMAT), Isabel García-Cortés (CIEMAT), Julio Hernández-Sánchez (CIEMAT), Daniel Medina (CIEMAT), Kieran Joseph McCarthy (CIEMAT), Jaime de la Riva (CIEMAT)||In magnetic confinement fusion, fast-ions constitute a source of particles and free energy that, under certain conditions, drive various unstable MHD instabilities that significantly degrade fusion performance. In particular, the study of the impact of Alfvén Eigenmodes (AEs) is of special importance for controlling fast-ion transport across the magnetic field. The present experiment aims to study the influence of fast-ion losses induced by AEs in pure NBI-heated & overlapped ECR and NBI plasmas
|-
| Studies of deuterium pellet plasmoid drift in different magnetic configurations||Panadero, Nerea||CIEMAT||K. J. McCarthy (CIEMAT), B. López-Miranda (CIEMAT), K. J. McCarthy (CIEMAT), A. Baciero (CIEMAT), F. Medina (CIEMAT), I. Pastor (CIEMAT), J. M. Fontdecaba (CIEMAT), I. García-Cortés (CIEMAT), R. García (CIEMAT), J. Hernández-Sánchez (CIEMAT), D. Medina-Roque (CIEMAT), J. De la Riva (CIEMAT)||The aim of this proposal is to quantify the pellet plasmoid drift in the early stages of the homogenisation process for different hydrogen isotopes in either the working gas or the pellet. The idea is to study possible differences in plasmoid drift for different combinations of protium and deuterium. In addition, results will be compared with HPI2 predictions, as part of the current effort to evaluate the stellarator version of HPI2 for the TJ-II, W7-X, LHD and Heliotron J devices.
|-
| Assessment of the influence of pellet fuelling efficiency on the magnetic well in the TJ-II stellarator||Panadero, Nerea||CIEMAT||N. Panadero, K. J. McCarthy (CIEMAT), B. López-Miranda (CIEMAT), A. Baciero (CIEMAT), F. Medina (CIEMAT), I. Pastor (CIEMAT), J. M. Fontdecaba (CIEMAT), I. García-Cortés (CIEMAT), R. García (CIEMAT), J. Hernández-Sánchez (CIEMAT), C. Hidalgo (CIEMAT), D. Medina-Roque (CIEMAT), J. De la Riva (CIEMAT)||The aim of this proposal is to quantify the effect of the magnetic well (W) on pellet fuelling efficiency. This may be key as this magnitude could play a significant role in plasmoid behaviour. Therefore, it may be relevant for the development and design of fuelling by pellet injection (PI) in a stellarator reactor. Also, experimental results will be compared with HPI2 predictions, as part of the current effort to evaluate the stellarator version of HPI2 for the TJ-II, W7-X, LHD and Heliotron J.
|-
| Investigation of the impact of LBO impurity injection immediately after cryogenic deuterium pellet injection (PI) on confinement time in the TJ-II plasmas ||López-Miranda, Belén||CIEMAT||Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT), Teresa Estrada (CIEMAT), Josep María Fontdecaba (CIEMAT), Raúl García (CIEMAT), Isabel García-Cortés (CIEMAT), Julio Hernández-Sánchez (CIEMAT), Daniel Medina (CIEMAT), Kieran Joseph McCarthy (CIEMAT), Jaime de la Riva (CIEMAT).||The aim of this experiment is to study the confinement time after PI & LBO impurities into ECRH TJ-II plasmas. This is of interest since PI causes transient changes in plasma kinetic profiles, Er and turbulence. A large PI into an on-axis ECRH leads to a collapse with rapid energy losses and plasma termination. Radiative cooling due to impurities affects the energy, and Te decays. We try to study the isotope effect in transport due to LBO injection inmediately after D or H PI in H/D plasmas.
|-
| Study of the isotope effect into fast-ion losses in NBI-heated plasmas in the TJ-II stellarator.||López-Miranda, Belén ||CIEMAT||Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT), Álvaro Cappa (CIEMAT), Andrés Bustos (CIEMAT), Juan Fraguas (CIEMAT), David Jiménez-Rey (CIEMAT), José Luis Velasco (CIEMAT), Pedro Pons-Vilallonga (CIEMAT), Arturo Alonso (CIEMAT), Claudia Salcuni (University of Trieste), Teresa Estrada (CIEMAT), Josep María Fontdecaba (CIEMAT), Raúl García (CIEMAT), Jaime de la Riva (CIEMAT)||In MCF, FI are a source of particles and free energy that drive various unstable MHD instabilities that degrade fusion performance. Then, the power transferred to the main plasma decreases and its heating efficiency drops. FI losses depend on many factors, such as the working gas, energy, mass, source, pitch angle and charge of the ion, etc. Thus, experimental studies and theoretical validations of FI losses are required to understand the behaviour of fast particles in stellarators
|-
| Commissioning of Pellet Injector for Deuterium Pellets||Kieran McCarthy||Ciemat||Isabel García, Nerea Panadero||Hydrogen pellets have been injected into ECRH and NBI plasmas since 2014. With these, a large pellet database has been created for TJ-II. This has enabled investigation of pellet ablation, plasmoid drift, pellet deposition, fuelling efficiency, etc. Plasmoid drift, pellet particle deposition and efficiency should be isotope sensitive. It is intended to extent the TJ-II database to both D2 pellets. For this, tests need to be performed to achieve reliable D2 pellet formation and acceleration.
|-
| The influence of pellet start-time and separation times on improved performance in TJ-II NBI heated plasmas||Kieran McCarthy||Ciemat||Isabel García||Cryogenic pellet injection causes a step-like increase in density and significant improvements in performance (diamagnetic energy & energy confinement) of NBI-heated TJ-II plasmas. Additional injections further improve this, however, the pellet sizes and separations between pellets can determine if such a phase is maintained or if operational boundaries are reached. Multiple injections with varied separations will be made to maximize such improvements and investigate these limits in TJ-II.
|-
| Study of pre- and post-pellet injection phases with a Langmuir probe on the TJ II stellarator||Ivanova, Pavlina||Institute of Electronics, Bulgarian Academy of Sciences||Miglena Dimitrova (Institute of Plasma Physics, Czech Academy of Sciences), Embie Hasan (Institute of Electronics, Bulgarian Academy of Sciences) , Elmira Vasileva (Institute of Electronics, Bulgarian Academy of Sciences)||Pellet injection (PI) is performed on the TJ-II for fuelling and impurity transport studies. When NBI heating is used, a PI can induce an enhanced confinement phase. Langmuir probes are frequently used for acquiring plasma parameters in the SOL of stellarators. Determining plasma parameters using electric probes in the pre- and post-PI phase under various experimental conditions (ECRH and NBI phases) can contribute to understand the physical processes and effects of pellets in the SOL.
|-
| Impurity-hole plasmas in TJ-II||Daniel Medina Roque||CIEMAT||J.L. Velasco (CIEMAT), I. García-Cortés (CIEMAT), K. McCarthy (CIEMAT), N. Tamura (NIFS), TJ-II Team||Achieve a positive Er in the outer plasma region and a negative one in the inner part to reproduce the plasma conditions in impurity-hole phenomenon in LHD. Then, inject the same impurities in the edge by Laser Blow-Off (LBO) and in the core by TESPEL and analyze if there are significant differences in transport and confinement times for inter-machine comparison. This is a continuation of http://fusionwiki.ciemat.es/wiki/TJ-II:Comparison_of_transport_of_on-axis_and_off-axis_ECH-heated_plasmas
|-
| Injection of low-Z elements for turbulence reduction and confinement improvement for comparison with W7-X and LHD.||Federico Nespoli||PPPL||D. Medina-Roque (CIEMAT), A. de Castro (CIEMAT), I. García-Cortés (CIEMAT), K. McCarthy (CIEMAT), N.Tamura (NIFS) ||It has been observed in LHD and W7-X that the injection of low-Z impurities can have beneficial effects on plasmas by stabilizing turbulence and thus improve confinement. If this effect overcomes the negative effect of lost plasma power due to strong radiation fluxes, which is normally the case for low-Z impurities, then low-Z injections can result in increments of ion temperature and plasma diamagnetic energy in TJ-II. The objective is to study this in TJ-II for inter-machine comparison.
|-
| TESPEL injections into the pellet-induced enhanced confinement phase of NBI plasmas to evaluate core impurity confinement during this phase||Daniel Medina-Roque ||CIEMAT||K. McCarthy (CIEMAT), I. García-Cortés (CIEMAT), N. Tamura (NIFS), B. López-Miranda (CIEMAT), F. Medina Yela (CIEMAT), AND TJ-II TEAM||An enhanced energy confinement phase is induced in NBI-heated plasma of TJ-II by pellet injection. It is considered that impurity confinement maybe enhanced also during this phase. TESPEL allows tracer deposition in the high-density core region of such enhanced plasmas. Thus, TESPEL (core) and LBO (edge) results can thus provide new insights on impurity accumulation. Our results can be of significant interest for evaluating impurity confinement during pellet-induced enhanced performance in W7-X.
|-
| Impurity confinement dependence on TJ-II plasma temperature gradient by injecting different Z tracers for comparison with LHD||N. Tamura||NIFS (Japan)||D. Medina-Roque (CIEMAT), Isabel García Cortés (CIEMAT), Kieran McCarthy (CIEMAT), Belén López Miranda (CIEMAT), Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), René Bussiahn (IPP Greifswald)||Experimental results from the 24th LHD experimental campaign show a strong impact of ECRH deposition radial location on impurity confinement for a wide range of Z. Reduced peaking of Te profiles can result in significantly longer impurity confinement times and stronger degradation of plasma performance for high-Z elements. The goal of this experiment is to study the dependency of impurity confinement on target electron temperature gradient by repeating experiments already performed in LHD.
|-
| Checking the alignment of ECRH beams using power modulation||Cappa, Álvaro||LNF-CIEMAT||Martínez, José||Measure the power deposition profiles of both launched beam (ECH1 & ECH2) by means of fast power modulation (fmod>3 kHZ) aiming at detect possible misalignments.
|-
| Characterization of energy transport in TJ-II: Dependence on thermodynamic gradients and link to turbulence measurements.||Carralero, Daniel||CIEMAT|| A. Alonso (CIEMAT), A. Baciero (CIEMAT), A. Cappa (CIEMAT), T. Estrada (CIEMAT), J. M. García-Regaña, O. Kozachek, B. López-Miranda (CIEMAT), J. Martinez (CIEMAT), K. McCarthy (CIEMAT), E. Sánchez, I. Pastor (CIEMAT), H. Thienpondt (CIEMAT), J.L. Velasco (CIEMAT).||The objective of this proposal is to carry out a characterization of the profiles of ion and electron heat fluxes in order to obtain the turbulent transport coefficients and their dependence on local gradients, to be compared to local measurements of fluctuation amplitudes (HIBP, DR) and turbulent transport (HIBP). Besides providing a complete descripion of transport in TJ-II, these measurements will allow a detailed validation of turbulent transport predictions carried with gyrokinetic codes.
|-
| Characterization and modelling of the parallel dynamics of impurity ions with parallel and anti-parallel collinear NBI injection||Jaime de la Riva||CIEMAT||Arturo Alonso, Kieran Maccarthy||Here we propose to study the transmission of momentum to the plasma produced by the injection of neutral particles and other possible effects on the flow of impurities produced by the NBI. Parallel experiments have been proposed in W7-X OP2.1 and LHD 24th and 25 campaign.
|-
| NBI1 vs. NBI2 heated plasma comparison: impact of radial electric field and turbulence on impurity concentration and plasma performance||Estrada, Teresa||CIEMAT||A. Baciero, A. Cappa, B. López-Miranda, K. McCarthy, F. Medina, I. Pastor, J. de la Riva, J.L. Velasco ||NBI plasmas show differences that depend on injection direction, co- or counter-injection. Whereas the evolution of ne profiles is alike for both, Te, Zeff, Er and density turbulence profiles evolve differently, resulting in higher density limit and higher energy content for ctr-NBI. Experimental beam characterizations indicate that both present similar re-ionization losses & transmissions, while ASCOT simulations show more direct ion losses for co-NBI and slightly better efficiency for ctr-NBI.
|-
| Study on impurity content, radiative collapses and turbulence characterization in the vicinity of density limit in TJ-II ||Salcuni Claudia||CIEMAT||Arturo Alonso (CIEMAT), Nerea Panadero (CIEMAT), Belén López-Miranda (CIEMAT),A. Baciero (CIEMAT), F. Medina (CIEMAT), I. Pastor (CIEMAT), T. Estrada (CIEMAT), J. M. Fontdecaba (CIEMAT), I. García-Cortés (CIEMAT), R. García (CIEMAT), J. Hernández-Sánchez (CIEMAT), D. Medina-Roque (CIEMAT), k. J. McCarthy (CIEMAT), J. De la Riva (CIEMAT)||"The main objective of this proposal is to assess density ramps profiles scanning magnetic field configurations, then analyze the impurity content and see which impurity species affects the most the power radiated inside the plasma. Hence, choose a correct operational density limit as well as specific magnetic field configuration and characterize turbulence properties in the vicinity of the operational density limit."
|-
| Combining retarding-field energy analyzer and electrostatic probes measurements, an approach to measure the phase relation between density and temperature fluctuations using RFA||Nedzelskiy, Igor||IPFN||Carlos Silva (IPFN), Igor Voldiner (CIEMAT)||Physics behind uncoupled transport channels is a relevant open question for understanding both ELM control techniques (e.g. using RMP) as part of the ITER base-line scenario and the development of plasma scenarios without ELMs (e.g. I-mode). Transport channel decoupling could be driven by any mechanism that leads to a modification of the cross-phase between density and temperature fluctuations caused by changing driving conditions.
|-
| Commissioning Analyzer B, HIBP2||José Luis de Pablos||LNF-Ciemat||Oleksandr Kozachok, Oleksandr Chmyga, Isabel García Cortes, B. van Milligen||HIBPs allows to measure the plasma potential and Er profiles and density fluctuations and coherence between them. The addition of new TREKs HV amplifiers allow to control independently the HIBP-B and HIBP2-A and increase the total current of the beam to allow better SNR. This could help in the measurement of Medium-Range Correlation plasma potential important for the experiment "Turbulence characterization of pellet-induced enhanced confinement phase at TJII" leaded by Isabel García.
|-
| External control of Zonal Flows ||Jose Luis de Pablos||LNF-Ciemat||B.P. van Milligen (LNF-Ciemat), J.M. Barcala (Dpto Tecnología-Ciemat), A. Molinero (Dpto Tenologia-Ciemat), O. Kozachok (IPP-NSC KIPT), O. Chmyga (IPP-NSC KIPT), J. Romero (TAE), I. García-Cortes (LNF-Ciemat), C. Hidalgo(LNF-Ciemat)||Zonal flows are of fundamental importance for confinement in magnetically confined plasmas, as evidenced by the well-known H-mode, produced by a transport barrier in the edge of the plasma.The present proposal investigates the possibility of actively stimulating the development of such low-frequency zonal flows through feedback.
|-
| Particle and energy propagation with edge plasma polarization||Xiao, Chijin||University of Saskatchewan, Canada||Voldiner, Igor (CIEMAT)||The main objective of the proposal is to study the relationship between the particle/energy transport and the plasma velocity shear in the TJ-II stellarator. In addition to linear cross-correlation analyses, nonlinear cross-correlation analysis will be used to study the strength and direction of energy transport (ref: Phys. Rev. Lett. 79, 2458 (1997) - Nonlinear Radial Correlation of Electrostatic Fluctuations in the STOR-M Tokamak (aps.org)).
|-
| Assessment of the impact of background hydrogen isotope on impurity behaviour in TJ-II||Daniel Medina Roque||CIEMAT||Isabel García Cortés (CIEMAT), Kieran McCarthy (CIEMAT), Belén López Miranda (CIEMAT), Nerea Panadero (CIEMAT), Alfonso Baciero (CIEMAT), Naoki Tamura (NIFS), René Bussiahn (IPP Greifswald)||Experimental results in the LHD have shown that deuterium plasmas have better impurity confinement than hydrogen plasmas. TESPEL and LBO impurity injections will be performed into H2 and D2 plasmas with similar electron densities and temperatures in CERC and CIRC. This comparison between CERC and CIRC is very interesting because the sign of the radial electric field affects the sign of the convection velocity coefficient of the impurity transport and thus the impurity confinement time.
|-
|}

== Experimental proposals, Spring 2023 ==

Creation date: 20/03/2023 08:45. Please do no edit this table.

[[Media:Minutes_Meeting_of_the_Access_Committee_March_28_2023.pdf| Minutes]] of the TJ-II Access Committee Meeting, March 28, 2023 .

{| class="wikitable"
! Title !! Main proponent !! Main proponent's affiliation !! Other proponents !! Specific objectives of the experiment
|-
| Injection of cryogenic pellets in TJ-II operated with an inverted magnetic field || McCarthy, Kieran Joseph || Ciemat || García Cortés, Isabel || When a pellet is injected, it is ablated by plasma and clouds that detach from it should drift down the B-field gradient. In tokamaks, drifting facilitates efficient pellet fuelling for high-field side injection. However, in helical devices, the effect of such drifting is not clear. Thus, the inversion of the TJ-II B field provides a unique opportunity to compare cloud drifting and particle deposition in a helical device. No differences are expected but this needs experimental confirmation.
|-
| Rational surfaces, flows and radial structure in the TJ-II stellarator: Part II || van Milligen, Boudewijn || CIEMAT || Igor Voldiner (CIEMAT), Benjamin Carreras (UC3M) || We will expand the iota scan of Day 17/03/2022, reported in B.Ph.van Milligen et al., Plasma Phys. Control. Fusion 64 (2023), p. 055006. It revealed an interesting pattern of the poloidal flow velocity, v_theta, linked to low order rational surfaces. Using turbulence modelling, this pattern was shown to be due, likely, to the formation of a staircase pattern in the profiles. By expanding the scan range, here we will study the effect of several major rational surfaces (3/2, 8/5, 5/3).
|-
| Continuation of studies of pellet plasmoid drift in different magnetic configurations || Panadero, Nerea || CIEMAT || Kieran McCarthy (CIEMAT), Julio Hernández-Sánchez (CIEMAT), Isabel García-Cortés (CIEMAT), Daniel Medina-Roque (CIEMAT) || The main objective of this proposal is to quantify pellet plasmoid drift in the early stages of the homogenization process, and its relationship with rational surfaces for magnetic configurations with an iota profile lower than the standard configuration. In addition, experimental results will be compared with HPI2 predictions, since these experiments will be also part of the current effort to evaluate the stellarator version of HPI2 for the TJ-II, W7-X, LHD and Heliotron-J devices.
|-
| Spectroscopic Gas Puff Imaging (SGPI) for edge plasma characterisation || de la Cal, Eduardo || CIEMAT || Igor Voldiner (CIEMAT), Boudewijn van Milligen (CIEMAT) || Characterise the edge plasma boundary with the new SGPI system, with focus on 2-dimensional (2D) imaging of electron density (ne) and temperature (Te) turbulence and its coupling to neutrals.The SGPI diagnostic has shown in the last campaign the ability to obtain 2D measurements of the edge plasma ne and Te with a spatial resolution of , 4 mm and exposure times down to 10 microseconds.
|-
| Studying fast-ion losses induced by Alfvén Eigenmodes in NBI heated plasmas of the stellarator TJ-II || López-Miranda, Belén || CIEMAT || Baciero, Alfonso; Cappa, Álvaro; Medina, Francisco; Pons-Villalonga, Pedro || In magnetic confinement fusion, fast-ions constitute a source of particles and free energy that, under certain conditions, drive various unstable MHD instabilities that significantly degrade fusion performance. In particular, the study of the impact of Alfvén Eigenmodes (AEs) is of special importance for controlling fast-ion transport across the magnetic field. The present experiment aims to study the influence of fast-ion losses induced by AEs in pure NBI-heated & combined ECR and NBI plasmas.
|-
| Impact of the rotational transform on pellet-induced enhanced performance in the TJ-II stellarator || Carreras, Benjamin || UC3M || Isabel García Cortés (CIEMAT), Kieran McCarthy (CIEMAT), Boudewijn van Milligen (CIEMAT) || In recent work, we observed pellet-induced enhanced confinement at the TJ-II stellarator [reference]. Analysis suggest that this enhancement could be related to the formation of transport barriers associated with low-order rational surfaces. Using the C-mode, i.e., the continuous variation of the rotational transform, we intend to shed further light on this issue.
|-
| External control of ZF in the TJ-II stellarator || De Pablos, José Luis || LNF || B.P. van Milligen, J.M. Barcala, A. Molinero, O. Kozachok (KIPT), O. Chmyga(KIPT), J. Romero (TAE), C. Hidalgo || The present proposal investigates the possibility of actively stimulating and control the development of low-frequency zonal flows through feedback.
|-
| Plasma Characterisation with Deuterium pellet injection || Isabel García Cortés || CIEMAT || Kieran McCarthy (CIEMAT), Daniel Medina-Roque (CIEMAT), Nerea Panadero (CIEMAT) || "Enhanced confinement is seen in TJ-II NBI-heated plasmas after single H pellet injection. In addition to the expected rise of core electron density, the plasma diamagnetic energy content rises by up to 40% with respect to similar discharges without PI. Enhancement is larger (up to 70%) when multi-pellets are used. To date, only H pellets into hydrogen plasmas have been studied. Our proposal is to inject deuterium pellets into deuterium plasmas to explore the isotope effect on this PiEC phase.
|-
| Recommissioning of the CXRS/MSE systems || McCarthy, Kieran Joseph || Ciemat || Jaime de la Riva Villen (Ciemat), Isabel García Cortés (Ciemat) || TJ-II is equipped with a compact NBI for performing CXRS and MSE. The NBI has been non-operative for several years due to a vacuum leak. The leak has been located and repaired. It is intended to recommission the CXRS diagnostic during this campaign. CXRS allows obtaining radial measurements of ion temperature, ion toroidal and poloidal velocity and radial electric field. Once operational, it will be used to measure these parameters during the PiEC phases achieved after pellet injection.
|-
| TJ-II: Calibration of the helical arrays of Mirnov coils || Pons-Villalonga, Pedro || CIEMAT || Álvaro Cappa (CIEMAT) || Calibration of the arrays of Mirnov coils, which is essential to correctly determine the mode numbers of the MHD perturbations.
|-
| NBI1 vs. NBI2 heated plasma comparison under reversed field conditions || Estrada, Teresa || CIEMAT || Arturo Alonso (CIEMAT), Alvaro Cappa (CIEMAT), Belen Lopez-Miranda (CIEMAT), Francisco Medina (CIEMAT), Ignacio Pastor (CIEMAT), Jose Luis Velasco (CIEMAT), NBI team. || A systematic comparison of plasmas heated with co- or ctr-NBI shows differences in the maximum achievable density and stored energy; lower values are generally achieved in co-NBI heated plasmas associated to higher impurity accumulation. A more intense negative Er and a reduction in the turbulence are measured in co-NBI heated plasmas as compared to counter- NBI cases. The interpretation of the experimental observations would benefit from experiments carried out under reversed field conditions.
|-
| Internal density measurements of plasmoid in hydrogen pellet || Gen Motojima || National Institute for Fusion Science (NIFS) || Nerea Panadero, Kieran McCarthy, Shinichiro Kado(Kyoto Univ.) || The objective is to evaluate the plasmoid density in hydrogen pellet to understand the pellet ablation. The measurement of plasmoid density has been conducted in LHD and Heliotron J, there is a difference of plasmoid density in them probably due to the difference of background plasma parameters. If the plasmoid density is evaluated also in TJ-II, it must help the understanding of mechanism of pellet ablation.
|-
| Impurity hole plasmas in TJ-II || Daniel Medina Roque || CIEMAT || Jose Luis Velasco (CIEMAT), Kieran McCarthy (CIEMAT), Isabel García-Cortés (CIEMAT), Álvaro Cappa (CIEMAT), Belén López-Miranda (CIEMAT), Alfonso Baciero (CIEMAT), Francisco Medina (CIEMAT), Teresa Estrada (CIEMAT), Daniel Carralero (CIEMAT), Emmanouil Maragkoudakis (CIEMAT) || Achieve a positive radial electric field (Er) in the outer plasma region and a negative one in the inner part to reproduce the plasma conditions in the impurity-hole phenomenon in LHD. Then inject the same impurities in the edge by Laser Blow-Off (LBO) and in the core by TESPEL and analyze if there are significant differences in their transport and confinement time. This is a continuation of http://fusionwiki.ciemat.es/wiki/TJ-II:Comparison_of_transport_of_on-axis_and_off-axis_ECH-heated_plasmas
|-
| Flux suppression via turbulence amplitude and cross phase across radial electric field variation || Tatsuya, Kobayashi || NIFS || || Anomalous cross-field transport suppression by radial electric field in torus plasmas is one of central research topics in fusion plasma physics. A prototypical example is the low-to-high confinement mode transition (L-H transition) triggered under a certain level of plasma heat input. In this experiment, we investigate how the turbulent transport is suppressed via the turbulence amplitude suppression and modification of cross phase between potential and density fluctuations.
|-
| Continuation of Imaging of pellet cloud dynamics observations in TJ-II using Halpha and bremsstrahlung filters and a fast-frame camera || Gabor Kocsis || Centre for Energy Research || Tamás Szepsi (Centre for Energy Research), Nerea Panadero (CIEMAT), Kieran McCarthy (CIEMAT), Julio Hernández-Sánchez (CIEMAT) || The aim of this proposal is to study the interaction of hydrogen and impurity pellets (TESPELs) with the stellarator plasma by evaluating fast-framing video data. Similar experiments have already been performed at TJ-II, in which drifting pellet clouds were observed. However, for hydrogen pellets, it was hard to recognize single clouds. Therefore, experiments with higher temporal resolution, in several scenarios and magnetic configurations, also using different optical filters, are now proposed.
|-
| Neutral beam current drive in reversed field configuration || Álvaro Cappa || CIEMAT || José Luis Velasco, J. Martínez || The goal of the experiment is to measure the amplitude of toroidal current driven by both NBIs in reversed field configuration and compare with the results obtained in the standard conditions.
|-
| The pulsed ECRH wall conditioning scenario for W7-X || Moiseenko, Vladimir || Division of Electricity, Angstrom Laboratory, Uppsala University, Uppsala, Sweden || Yurii Kovtun (KIPT), Andrei Goriaev (FZJ), Dirk Naujoks (IPP), Torsten Stange (IPP), Chandra-Prakash Dhard (IPP), Heinrich Laqua (IPP) || The main goal of the research proposed includes the study of the physical properties of pulsed ECRH wall conditioning discharges, their optimization, usage, and the wall conditioning process caused by them. The optimization studies aiming to shorten the plasma decay stage which gives an opportunity to decrease the time period between shots. Based on these studies, a scenario for wall conditioning at Wendelstein 7-X will be developed.
|-
| Optimisation of fast-ion confinement TJ-II plasmas || Garcia-Munoz, Manuel || University of Seville || Galdon-Quiroga (University of Seville), Van Vuuren (University of Seville), Viezzer (University of Seville), Gonzalez-Martin (University of Seville) || Optimisation of fast-ion confinement in TJ-II. Optimal TJ-II magnetic topology, kinetic profiles and NBI parameters for fast-ion confinement. AE control with localised ECRH / ECCD
|-
| Characterization and modelling of the parallel dynamics of impurity ions with and without continuous NBI injection. || Jaime de la Riva Villén || CIEMAT || Arturo Alonso, CIEMAT. Kieran Maccarthy || We propose to investigate the possible effect of NBI momentum injection on the net parallel velocity of the plasma ions and impurities analyzing measurements obtained by CXRS diagnostic. The net parallel velocity of the individual plasma species is a prediction of the neoclassical theory in non-symmetric system. The combination of these parallel flow fields results in the so-called bootstrap current, the accurate prediction of which is of importance in stellarator concepts.
|-
| CXRS flow measurements: Density and ECRH scan || Jaime de la Riva Villén || CIEMAT || Arturo Alonso, CIEMAT. Kieran Maccarthy, CIEMAT || The objective is to study trends in radial electric field and net parallel velocity profiles in different plasma conditions and magnetic configurations and comparing it with neoclassical expectations. The dependency on the line integrated density, the ECRH power and the magnetic configuration of the flow measurements will be analyzed.
|-
| New mechanisms for shear production? || DIF-PRADALIER Guilhem || CEA/IRFM || SARAZIN Yanick (CEA/IRFM) || Zonal flows (ZF) are ubiquitous and play a central role in the regulation of transport in tokamaks, stellarators and RFPs. It is commonly agreed that turbulent Reynolds stresses, product of ExB flow fluctuations is the main drive for ZF production. This has been questioned experimentally [1]. Theoretically and computationally [2,3] a diamagnetic contribution to ZF production has been evidenced, product of ExB and diamagnetic fluctuations. Experimentally testing this mechanism would be a first.
|-
| Exploring basic mechanisms for the density limit || DIF-PRADALIER Guilhem || CEA/IRFM || SARAZIN Yanick (CEA/IRFM) || Density limits ubiquitously appear in tokamaks, stellarators and RFPs. Competing mechanisms have been proposed, ranging from MHD/radiative cooling [1] and radiation collapse [2] to transport scenarios: linear changes in dominant edge mode [3] or collapse of the edge shear layer consecutive to depletion of the zonal flow (ZF) drive [4,5]. Testing these scenarios within the same experiments, with special emphasis on aspects of the latter shear collapse scenario is timely and of broad significance.
|-
| Combining retarding-field energy analyzer and electrostatic probes measurements, an approach to measure the phase relation between density and temperature fluctuations using RFA || Igor Nedzelskiy || IPFN || Carlos Silva (IPFN), Igor Voldiner (Ciemat), HIBP team || Physics behind uncoupled transport channels is a relevant open question for understanding both ELM control techniques (e.g. using RMP) as part of the ITER base-line scenario and the development of plasma scenarios without ELMs (e.g. I-mode). Transport channel decoupling could be driven by any mechanism that leads to a modification of the cross-phase between density and temperature fluctuations caused by changing driving conditions..
|-
| Assessment of the impact of background hydrogen isotope on the impurity behavior in TJ-II || Naoki Tamura || NIFS || Daniel Medina Roque (CIEMAT), Isabel García-Cortés (CIEMAT), Kieran McCarthy (CIEMAT) || Experimental results in LHD have shown that deuterium plasmas have better impurity confinement compared to hydrogen plasmas. Thus, TESPEL and LBO impurity injections will be performed into hydrogen and deuterium plasmas with similar electron density and temperature to assess the isotope effect of background hydrogen on the impurity behavior in TJ-II.
|-
| Continuation of studies of impurity injection by LBO technique with fast camera images || López-Miranda, Belén || CIEMAT || Panadero, Nerea; Baciero, A.; Estrada, T.; García-Regaña, J. M.; McCarthy, K. J.; Medina, D.; Medina, F., Ochando, M. A.; Pastor, I.; Velasco, J. L. || Near the transition to a Er>0, an increase in confinement time was observed. Here, we try to study the confinement time in ion-root regimes using LBO observing the transport process with fast camera images, continuing with previous works: http://fusionwiki.ciemat.es/wiki/TJ-II:_Impurity_injection_by_laser_blow-off_(LBO):_Confinement_and_transport_studies_of_high_Z_impurity_injection_by_LBO_in_ion-root_scenarios_(II)._Comparison_to_neoclassical_and_turbulence_simulations.
|-
| TESPEL injections in turbulence reduced plasmas via pellet injection || Daniel Medina Roque || CIEMAT || Isabel García-Cortés (CIEMAT), Kieran McCarthy (CIEMAT), Naoki Tamura (NIFS) || Characterize the impurity confinement with TESPEL and LBO injections in the transient turbulence reduction of Pellet Induced Enhanced Confinement plasmas to assess if impurities are confined for longer times and if the deposition location of the impurities play an important role.
|-
| Lithium hydride pellet injection in TJ-II plasmas || de Castro Calles, Alfonso || CIEMAT || || Lithium pellet/powder injection has shown to drive positive effects on confinement linked to the very low plasma contamination level and decreased hydrogen recycling on the boundary with an special influence on ELM pacing and suppression in devices like NSTX and EAST tokamaks. In TJ-II, lithium hydride LiH) is pretended to be used as a surrogate for lithium due to more simple manipulation and the easier pellet fabrication when compared to pure Li pellets
|-
| Assessment of impurity screening in TJ-II || Naoki Tamura || NIFS || Daniel Medina Roque (CIEMAT), Isabel García-Cortés (CIEMAT), Kieran McCarthy (CIEMAT) || In LHD impurity screening features have been observed in high-density plasmas leading to higher impurity confinement times for core-deposited impurities via TESPEL in contrast with lower values for impurities deposited in the edge by both gas puffing and LBO. A density scan will be performed and impurities will be deposited by the different methods into reproducible plasma discharges to compare the impurity confinement times in the different cases.
|-
| Divertor configurations in TJ-II: scenario development || Alonso, Arturo || CIEMAT || Eduardo de la Cal (CIEMAT), Daniel Carralero (CIEMAT), Marcos G. Barriopedro (UPM) || The objective of this proposal is to establish reliable operation scenarios for island divertor-like configurations in TJ-II. These configurations are based on the m=2 or m=4 edge island chain for configurations with edge iota close to 2 and could provide a means to explore ID SOL physics in TJ-II.
|-
| Characterization of energy transport in TJ-II: Dependence on thermodynamic gradients and link to turbulence measurements. || Carralero, Daniel || CIEMAT || A. Alonso (CIEMAT), A. Baciero (CIEMAT), A. Cappa (CIEMAT), T. Estrada (CIEMAT), J. M. García-Regaña, O. Kozachek, B. López-Miranda (CIEMAT), J. Martinez (CIEMAT), K. McCarthy (CIEMAT), E. Sánchez, I. Pastor (CIEMAT), H. Thienpondt (CIEMAT), J.L. Velasco (CIEMAT). || The objective of this proposal is to carry out a characterization of the profiles of ion and electron heat fluxes in order to obtain the turbulent transport coefficients and their dependence on local gradients, to be compared to local measurements of fluctuation amplitudes (HIBP, DR) and turbulent transport (HIBP). Besides providing a complete descripion of transport in TJ-II, these measurements will allow a detailed validation of turbulent transport predictions carried with gyrokinetic codes.
|-
| Plasma termination experiments using TESPELs || Tamura, Naoki || National Institute for Fusion Science || Kieran J. McCarthy (Ciemat), Isabel García-Cortés (Ciemat), Daniel Medina-Roque (Ciemat), Andreas Dinklage (IPP), Hjördis Bouvain (IPP), Thomas Wegner (IPP), René Bussiahn (IPP) || The main objective of this proposal is to study the mechanisms of plasma termination in response to a massive impurity (carbon and tungsten) injection. In addition, the impact of the heat deposition profile on the termination process is also a topic to be investigated. Therefore, the proposed experiments will be done in ECR-heated and NBI-heated plasmas. And to get some ideas regarding the isotope effect on such phenomena, the experiments will be performed in hydrogen and deuterium plasmas.
|-
| Impact of impurities on turbulent transport || García Regaña, José Manuel || CIEMAT || J. M. García-Regaña (CIEMAT), A. Alonso, A. Baciero, I. Calvo, D. Carralero, T. Estrada, A. González-Jerez, B. López-Miranda, K. McCarthy, D. Tafalla, H. Thienpondt … || Deliberate injection of impurities has been used to access high ion temperature (Ti) scenarios with los turbulence in LHD and to increase transiently Ti in W7-X. Moreover, gyrokinetic simulations have confirmed that impurities can reduce or enhance turbulent fluctuations and heat fluxes, depending on the sign of the impurity density gradient. The present proposal aims at characterizing the role that impurities have on turbulent transport and, consequently, on the performance of TJ-II.
|-
| Measurements of electron adiabaticity and comparisons with gyrokinetic simulations || Yanna, Kaitlyn || MIT || Arturo Alonso (CIEMAT) and others || The proposals aims at quantifying the phase difference between electron density and electrostatic potential fluctuations and the two-point Gamma-ExB flux in plasmas with varying values of local density gradient. This proposal's objective is to compare the HIBP measurements of the above-mentioned quantities with the gyrokinetic simulations by Thienpondt et al.
|-
| HIBP-based investigation of the properties of Alfvén Eigendmodes || Kozachok, Oleksandr || KIPT || Oleksandr Chmyga (KIPT), Álvaro Cappa (CIEMAT), Arturo Alonso (CIEMAT) || Continue the characterisation of the AE spatial-temporal dynamics of the density and potential oscillations (symmetry, particle flux). The medium term goal is to validate model predictions.
|}

== Experimental proposals, Spring 2022 ==
Deadline: January 24, 2022
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addfirstcategorydate = true
</DynamicPageList>

'''Session allocation (February - March)''' ([[Media:Planning Spring2022A Endorsed V3.pdf| Feb 18]], Approved by the Access Committee on March 2, [[Media:20220302 Minutes TJ-II Access Committee.pdf| Minutes]]).

'''Session allocation (April - June)''' ([[Media:Planning Spring2022B Internal.pdf| April 6]], Approved by the Access Committee on April 8, [[Media:Minutes_Meeting_of_the_Access_Committee_April_8_2022.pdf| Minutes]]).

== Experimental proposals, Autumn 2021 ==
Deadline: October 1, 2021
<DynamicPageList ordermethod = created>
category = TJ-II experimental proposals Autumn 2021
nottitlematch=TJ-II:Proposal template
mode = ordered
</DynamicPageList>

== Experimental proposals, Spring 2021 ==
Deadline: January 30, 2021
<DynamicPageList ordermethod = created>
category = TJ-II experimental proposals Spring 2021
nottitlematch=TJ-II:Proposal template
mode = ordered
</DynamicPageList>

Resolution of the experimental proposals Autumn 2019 and Feb_2020

[[Media:TJII_Access_Committee_February_2021_v1.pdf|TJII_Access_Committee_February_2021_v1.pdf]]

== Experimental proposals, Spring 2020 ==
Deadline: January 23, 2020
<DynamicPageList ordermethod = created>
category = TJ-II experimental proposals Spring 2020
nottitlematch=TJ-II:Proposal template
mode = ordered
</DynamicPageList>

Resolution of the experimental proposals Autumn 2019 and Feb_2020

[[Media:20191122 TJII Access Committee Nov2019 v1.pdf|20191122 TJII Access Committee Nov2019 v1.pdf]]

== Experimental proposals, Autumn 2019 ==
Deadline: October 15, 2019
<DynamicPageList ordermethod = created>
category = TJ-II experimental proposals Autumn 2019
nottitlematch=TJ-II:Proposal template
mode = ordered
</DynamicPageList>

Resolution of the experimental proposals Autumn 2019

[[Media:20191122 TJII Access Committee Nov2019 v1.pdf|20191122 TJII Access Committee Nov2019 v1.pdf]]

== Experimental proposals, Spring 2019 ==
Deadline: January 29, 2019

<DynamicPageList>
category = TJ-II experimental proposals Spring 2019
nottitlematch=TJ-II:Proposal template
mode = ordered
</DynamicPageList>

Resolution of the experimental proposals Spring 2019

[[Media:20190301 TJII Access Committee Fe2019 final.pdf|20190301 TJII Access Committee Fe2019 final.pdf]]

== Experimental proposals, Autumn 2018 ==
Deadline: October 10, 2018

<DynamicPageList>
category = TJ-II experimental proposals Autumn 2018
nottitlematch=TJ-II:Proposal template
mode = ordered
</DynamicPageList>

Resolution of the experimental proposals Autumn 2018

[[Media:20181027 Plan TJII Nov Dec 2018 v6.pdf|20181027 Plan TJII Nov Dec 2018 v6.pdf]]

== Experimental proposals, Spring 2018 ==
Deadline: March 7, 2018

<DynamicPageList>
category = TJ-II experimental proposals Spring 2018
nottitlematch=TJ-II:Proposal template
mode = ordered
</DynamicPageList>

Resolution of the experimental proposals Spring 2018

[[Media:20180423 Plan TJII April June 2018 v11.pdf|20180423 Plan TJII April June 2018 v11.pdf]]

== Experimental proposals, Spring 2017 ==
Deadline: January 26, 2017

[[:Category:TJ-II experimental proposals 2017]]


Resolution of the experimental proposals Spring 2017

[[Media:20170206 Plan TJII Feb June 2017 v15.pdf|20170206 Plan TJII Feb June 2017 v15.pdf]]

== See also ==

* [[TJ-II:Experimental program]] (not yet in use)
* [http://intranet-fusion.ciemat.es/document-server/tj-ii-experimental-program/ Experimental programs for earlier years (2002-2017)] (Intranet, password required)
* A new proposal page is created on the basis of this [[TJ-II:Proposal template|Proposal template]]. You do not need to view or modify it. Note for administrators: at the end of the template, the category of the proposal is specified (e.g, 'Autumn 2018'), which will determine to which list of proposals the proposal belongs.

[[Category:TJ-II internal documents]]

Software tools

2025-10-02T20:12:25Z

Admin: /* Text editing tools */

On this page, you will find a list of useful publicly available software tools, for data analysis, graphical display, etc.

== Emulation, file management ==

* [http://xquartz.macosforge.org/landing/ XQuartz] X-window system for Mac
* [http://mobaxterm.mobatek.net/ MobaXterm] X-window system for Windows
* [http://www.chiark.greenend.org.uk/~sgtatham/putty/ PuTTY] Telnet/SSH client for Windows and Unix
* [https://filezilla-project.org/ FileZilla] Secure File Transfer

== Numerical tools and libraries ==

* [https://www.nr.com/ Numerical Recipes]
* [https://gcc.gnu.org/wiki/GFortran GNU Fortran]
* [https://www.gnu.org/software/octave/ Octave], a free alternative to [http://www.mathworks.com/products/matlab/ Matlab]
* [https://www.python.org/ Python], a programming language
** [https://www.enthought.com/products/canopy/ Canopy] Scientific and Analytic Python Deployment with Integrated Analysis Environment
** [https://docs.anaconda.com/anaconda/ Anaconda] Python distribution for large-scale data processing, predictive analytics, and scientific computing
** [https://www.sagemath.org/ SageMath] Free open-source mathematics software system licensed under the GPL. Its mission is to create a viable free open source alternative to Magma, Maple, Mathematica and Matlab
** [https://jupyter.org/ Jupyter] and [http://ipython.org/ IPython] Powerful browser-based notebook and interactive shells for Python and other languages
** [https://www.numpy.org/ NumPy] and [https://www.scipy.org/ Scipy] Fundamental packages for scientific computing with Python
** [https://matplotlib.org/ matplotlib] A python plotting library that produces publication quality figures
** [https://seaborn.pydata.org/ Seaborn] Python visualization library based on matplotlib. It provides a high-level interface for drawing attractive statistical graphics
** [https://pythonhosted.org/spyder/ Spyder] Open source cross-platform Integrated Development Environment for scientific programming in the Python language. Spyder integrates NumPy, SciPy, Matplotlib and IPython, as well as other open source software
** [https://www.jetbrains.com/pycharm/ PyCharm] PyCharm is an Integrated Development Environment used for programming in Python. It provides code analysis, a graphical debugger, an integrated unit tester, integration with version control systems, and supports web development with Django
** [http://vpython.org/ VPython] Python programming language plus a 3D graphics module called "visual". VPython makes it easy to create navigable 3D displays and animations
** [http://docs.enthought.com/mayavi/mayavi/ Mayavi] An application and library for interactive scientific data visualization and 3D plotting in Python
** [https://yt-project.org/ yt] An open-source python package for analyzing and visualizing volumetric data
** [https://pandas.pydata.org/ pandas] and [http://xarray.pydata.org/en/stable/ xarray] Easy-to-use data structures and data analysis tools for Python
** [http://www.pytables.org/ pytables] and [http://www.h5py.org/ h5py] Tools for using HDF5 data in Python
** [http://cython.org/ Cython] and [https://numba.pydata.org/ Numba] Tools that allow compiled speeds in Python
** [https://gafusion.github.io/OMFIT-source/ OMFIT] Software that supports integrated modeling and experimental data analysis of magnetically confined thermonuclear fusion experiments.
** [https://github.com/PlasmaPy/PlasmaPy/ PlasmaPy] An open source core Python package for plasma physics that is under development

== Mathematical tools ==

* [http://live.sympy.org/ SymPy], symbolic calculus using Python
* [http://people.math.sfu.ca/~cbm/aands/ Abramowitz and Stegun: Handbook of Mathematical Functions]

== Graphical tools ==

* [http://www.gnuplot.info/ GNUplot], also see [http://www.gnuplotting.org/ gnuplotting.org], for producing graphs from data
* [http://www.gimp.org/ GIMP], graphics editor
* [http://rsb.info.nih.gov/ij/features.html ImageJ], graphics editor and image analysis
* [https://inkscape.org/ InkScape], [[:Wikipedia:vector graphics|vector graphics]] editor
* [https://wci.llnl.gov/simulation/computer-codes/visit/ VisIt], an open Source, interactive, scalable, visualization, animation and analysis tool

== Text editing tools ==

* [http://en.wikibooks.org/wiki/LaTeX LaTeX]
** [http://pages.uoregon.edu/koch/texshop/ TeXShop], complete LaTeX + BibTeX package for Mac
** [http://bibdesk.sourceforge.net/ BibDesk], bibliography manager for Mac
** [http://www.chachatelier.fr/latexit/ LaTeXiT], compiles LaTeX formulas for presentations for Mac
** [https://www.sharelatex.com ShareLaTeX] and [https://www.overleaf.com/ Overleaf], collaborative writing websites for LaTeX
** [https://3142.nl/latex-diff/ LatexDiff], to compare different versions of a document and highlight changes
* [http://www.gnu.org/software/emacs/ Emacs], powerful plain text editor
* [https://www.barebones.com/products/bbedit/ BBEdit], powerful plain text editor for Mac
* [https://www.libreoffice.org/ LibreOffice], office suite of programs
* [https://www.authorea.com/ Authorea], a power collaborative writing website

== See also ==

* [http://connectedresearchers.com/online-tools-for-researchers/ Digital tools for researchers]
* [[:Wikipedia:List of revision control software|List of revision control software]]

Software tools

2025-10-02T20:11:35Z

Admin: /* Emulation, file management */

On this page, you will find a list of useful publicly available software tools, for data analysis, graphical display, etc.

== Emulation, file management ==

* [http://xquartz.macosforge.org/landing/ XQuartz] X-window system for Mac
* [http://mobaxterm.mobatek.net/ MobaXterm] X-window system for Windows
* [http://www.chiark.greenend.org.uk/~sgtatham/putty/ PuTTY] Telnet/SSH client for Windows and Unix
* [https://filezilla-project.org/ FileZilla] Secure File Transfer

== Numerical tools and libraries ==

* [https://www.nr.com/ Numerical Recipes]
* [https://gcc.gnu.org/wiki/GFortran GNU Fortran]
* [https://www.gnu.org/software/octave/ Octave], a free alternative to [http://www.mathworks.com/products/matlab/ Matlab]
* [https://www.python.org/ Python], a programming language
** [https://www.enthought.com/products/canopy/ Canopy] Scientific and Analytic Python Deployment with Integrated Analysis Environment
** [https://docs.anaconda.com/anaconda/ Anaconda] Python distribution for large-scale data processing, predictive analytics, and scientific computing
** [https://www.sagemath.org/ SageMath] Free open-source mathematics software system licensed under the GPL. Its mission is to create a viable free open source alternative to Magma, Maple, Mathematica and Matlab
** [https://jupyter.org/ Jupyter] and [http://ipython.org/ IPython] Powerful browser-based notebook and interactive shells for Python and other languages
** [https://www.numpy.org/ NumPy] and [https://www.scipy.org/ Scipy] Fundamental packages for scientific computing with Python
** [https://matplotlib.org/ matplotlib] A python plotting library that produces publication quality figures
** [https://seaborn.pydata.org/ Seaborn] Python visualization library based on matplotlib. It provides a high-level interface for drawing attractive statistical graphics
** [https://pythonhosted.org/spyder/ Spyder] Open source cross-platform Integrated Development Environment for scientific programming in the Python language. Spyder integrates NumPy, SciPy, Matplotlib and IPython, as well as other open source software
** [https://www.jetbrains.com/pycharm/ PyCharm] PyCharm is an Integrated Development Environment used for programming in Python. It provides code analysis, a graphical debugger, an integrated unit tester, integration with version control systems, and supports web development with Django
** [http://vpython.org/ VPython] Python programming language plus a 3D graphics module called "visual". VPython makes it easy to create navigable 3D displays and animations
** [http://docs.enthought.com/mayavi/mayavi/ Mayavi] An application and library for interactive scientific data visualization and 3D plotting in Python
** [https://yt-project.org/ yt] An open-source python package for analyzing and visualizing volumetric data
** [https://pandas.pydata.org/ pandas] and [http://xarray.pydata.org/en/stable/ xarray] Easy-to-use data structures and data analysis tools for Python
** [http://www.pytables.org/ pytables] and [http://www.h5py.org/ h5py] Tools for using HDF5 data in Python
** [http://cython.org/ Cython] and [https://numba.pydata.org/ Numba] Tools that allow compiled speeds in Python
** [https://gafusion.github.io/OMFIT-source/ OMFIT] Software that supports integrated modeling and experimental data analysis of magnetically confined thermonuclear fusion experiments.
** [https://github.com/PlasmaPy/PlasmaPy/ PlasmaPy] An open source core Python package for plasma physics that is under development

== Mathematical tools ==

* [http://live.sympy.org/ SymPy], symbolic calculus using Python
* [http://people.math.sfu.ca/~cbm/aands/ Abramowitz and Stegun: Handbook of Mathematical Functions]

== Graphical tools ==

* [http://www.gnuplot.info/ GNUplot], also see [http://www.gnuplotting.org/ gnuplotting.org], for producing graphs from data
* [http://www.gimp.org/ GIMP], graphics editor
* [http://rsb.info.nih.gov/ij/features.html ImageJ], graphics editor and image analysis
* [https://inkscape.org/ InkScape], [[:Wikipedia:vector graphics|vector graphics]] editor
* [https://wci.llnl.gov/simulation/computer-codes/visit/ VisIt], an open Source, interactive, scalable, visualization, animation and analysis tool

== Text editing tools ==

* [http://en.wikibooks.org/wiki/LaTeX LaTeX]
** [http://pages.uoregon.edu/koch/texshop/ TeXShop], complete LaTeX + BibTeX package for Mac
** [http://bibdesk.sourceforge.net/ BibDesk], bibliography manager for Mac
** [http://www.chachatelier.fr/latexit/ LaTeXiT], compiles LaTeX formulas for presentations for Mac
** [https://www.sharelatex.com ShareLaTeX] and [https://www.overleaf.com/ Overleaf], collaborative writing websites for LaTeX
** [https://3142.nl/latex-diff/ LatexDiff], to compare different versions of a document and highlight changes
* [http://www.gnu.org/software/emacs/ Emacs], powerful plain text editor
* [http://www.barebones.com/products/textwrangler/ TextWrangler], powerful plain text editor for Mac
* [https://www.libreoffice.org/ LibreOffice], office suite of programs
* [https://www.authorea.com/ Authorea], a power collaborative writing website

== See also ==

* [http://connectedresearchers.com/online-tools-for-researchers/ Digital tools for researchers]
* [[:Wikipedia:List of revision control software|List of revision control software]]

Software tools

2025-10-02T20:09:03Z

Admin: /* Mathematical tools */

On this page, you will find a list of useful publicly available software tools, for data analysis, graphical display, etc.

== Emulation, file management ==

* [http://xquartz.macosforge.org/landing/ XQuartz] X-window system for Mac
* [http://mobaxterm.mobatek.net/ MobaXterm] X-window system for Windows
* [http://www.chiark.greenend.org.uk/~sgtatham/putty/ PuTTY] Telnet/SSH client for Windows and Unix
* [http://rsug.itd.umich.edu/software/fugu/ Fugu] Secure File Transfer for Mac

== Numerical tools and libraries ==

* [https://www.nr.com/ Numerical Recipes]
* [https://gcc.gnu.org/wiki/GFortran GNU Fortran]
* [https://www.gnu.org/software/octave/ Octave], a free alternative to [http://www.mathworks.com/products/matlab/ Matlab]
* [https://www.python.org/ Python], a programming language
** [https://www.enthought.com/products/canopy/ Canopy] Scientific and Analytic Python Deployment with Integrated Analysis Environment
** [https://docs.anaconda.com/anaconda/ Anaconda] Python distribution for large-scale data processing, predictive analytics, and scientific computing
** [https://www.sagemath.org/ SageMath] Free open-source mathematics software system licensed under the GPL. Its mission is to create a viable free open source alternative to Magma, Maple, Mathematica and Matlab
** [https://jupyter.org/ Jupyter] and [http://ipython.org/ IPython] Powerful browser-based notebook and interactive shells for Python and other languages
** [https://www.numpy.org/ NumPy] and [https://www.scipy.org/ Scipy] Fundamental packages for scientific computing with Python
** [https://matplotlib.org/ matplotlib] A python plotting library that produces publication quality figures
** [https://seaborn.pydata.org/ Seaborn] Python visualization library based on matplotlib. It provides a high-level interface for drawing attractive statistical graphics
** [https://pythonhosted.org/spyder/ Spyder] Open source cross-platform Integrated Development Environment for scientific programming in the Python language. Spyder integrates NumPy, SciPy, Matplotlib and IPython, as well as other open source software
** [https://www.jetbrains.com/pycharm/ PyCharm] PyCharm is an Integrated Development Environment used for programming in Python. It provides code analysis, a graphical debugger, an integrated unit tester, integration with version control systems, and supports web development with Django
** [http://vpython.org/ VPython] Python programming language plus a 3D graphics module called "visual". VPython makes it easy to create navigable 3D displays and animations
** [http://docs.enthought.com/mayavi/mayavi/ Mayavi] An application and library for interactive scientific data visualization and 3D plotting in Python
** [https://yt-project.org/ yt] An open-source python package for analyzing and visualizing volumetric data
** [https://pandas.pydata.org/ pandas] and [http://xarray.pydata.org/en/stable/ xarray] Easy-to-use data structures and data analysis tools for Python
** [http://www.pytables.org/ pytables] and [http://www.h5py.org/ h5py] Tools for using HDF5 data in Python
** [http://cython.org/ Cython] and [https://numba.pydata.org/ Numba] Tools that allow compiled speeds in Python
** [https://gafusion.github.io/OMFIT-source/ OMFIT] Software that supports integrated modeling and experimental data analysis of magnetically confined thermonuclear fusion experiments.
** [https://github.com/PlasmaPy/PlasmaPy/ PlasmaPy] An open source core Python package for plasma physics that is under development

== Mathematical tools ==

* [http://live.sympy.org/ SymPy], symbolic calculus using Python
* [http://people.math.sfu.ca/~cbm/aands/ Abramowitz and Stegun: Handbook of Mathematical Functions]

== Graphical tools ==

* [http://www.gnuplot.info/ GNUplot], also see [http://www.gnuplotting.org/ gnuplotting.org], for producing graphs from data
* [http://www.gimp.org/ GIMP], graphics editor
* [http://rsb.info.nih.gov/ij/features.html ImageJ], graphics editor and image analysis
* [https://inkscape.org/ InkScape], [[:Wikipedia:vector graphics|vector graphics]] editor
* [https://wci.llnl.gov/simulation/computer-codes/visit/ VisIt], an open Source, interactive, scalable, visualization, animation and analysis tool

== Text editing tools ==

* [http://en.wikibooks.org/wiki/LaTeX LaTeX]
** [http://pages.uoregon.edu/koch/texshop/ TeXShop], complete LaTeX + BibTeX package for Mac
** [http://bibdesk.sourceforge.net/ BibDesk], bibliography manager for Mac
** [http://www.chachatelier.fr/latexit/ LaTeXiT], compiles LaTeX formulas for presentations for Mac
** [https://www.sharelatex.com ShareLaTeX] and [https://www.overleaf.com/ Overleaf], collaborative writing websites for LaTeX
** [https://3142.nl/latex-diff/ LatexDiff], to compare different versions of a document and highlight changes
* [http://www.gnu.org/software/emacs/ Emacs], powerful plain text editor
* [http://www.barebones.com/products/textwrangler/ TextWrangler], powerful plain text editor for Mac
* [https://www.libreoffice.org/ LibreOffice], office suite of programs
* [https://www.authorea.com/ Authorea], a power collaborative writing website

== See also ==

* [http://connectedresearchers.com/online-tools-for-researchers/ Digital tools for researchers]
* [[:Wikipedia:List of revision control software|List of revision control software]]

TJ-II:Langmuir Probes

2025-09-29T16:30:02Z

Admin: /* See also */

[[File:TJ-II_Langmuir.png|400px|thumb|right|Location of the reciprocating Langmuir probes at TJ-II]]
[[TJ-II]] has two fast reciprocating drives for [[:Wikipedia:Langmuir probe|Langmuir probes]] (with a displacement velocity of approximately 1 m/s).
<ref>M.A. Pedrosa et al, ''Fast movable remotely controlled Langmuir probe system'', [[doi:10.1063/1.1149350|Rev. Sci. Instrum. '''70''' (1999) 415]]</ref>
<ref>E. Calderón et al, ''On the Influence of Probe Presheath on the Measurement of Fluctuation and E × B Turbulent Transport by Langmuir Probes'', [[doi:10.1002/ctpp.200410104|Contributions to Plasma Physics '''44''', Issue 7-8 (2004) 700 - 704]]</ref>
<ref>M.A. Pedrosa et al, ''Evidence of Long-Distance Correlation of Fluctuations during Edge Transitions to Improved-Confinement Regimes in the TJ-II Stellarator'', [[doi:10.1103/PhysRevLett.100.215003|Phys. Rev. Lett. '''100''' (2008) 215003]]</ref>
Probe drive 1 is located at φ = 38.2°, R=134 cm ([[TJ-II:Sectors|sector]] D4) and probe drive 2 at φ = 195° ([[TJ-II:Sectors|sector]] B2).

== Probe heads ==

Several different heads can be mounted on the reciprocating drives: e.g., staircase Langmuir probes, a rake probe (as of 2009), or a multi-pin Langmuir probe (2010).

{| border="0" style="width:450px;"
|- valign="top"
| [[File:Langmuir_probe_head.gif|200px|thumb|left|Photo of a staircase Langmuir probe head with three sets of measurement pins]]
| [[File:Multipin.jpg|200px|thumb|left|Photo of a multipin Langmuir probe head]]
|-
| [[File:TJ-II_Rake.png|400px|thumb|left|Photo of a 12-pin Langmuir rake probe head]]
| [[File:Probe_8.png|400px|thumb|left|Photo of an 8-pin Langmuir rake probe head]]
|-
| [[File:Vorticity probe.png|400px|thumb|left|Photo of a vorticity probe probe head<ref>D. Carralero Ortiz, ''Electromagnetic Instability Studies in Fusion Plasmas Edge'', [https://oa.upm.es/11485/ PhD thesis, UPM (2012)]</ref>]]
|
|}

== See also ==

* [[TJ-II:Limiter|Limiter probes]]
* [[TJ-II:Biasing probe|Biasing probe]]
* [[TJ-II:Retarding Field Analyzer|Retarding Field Analyzer]]

== References ==
<references />

TJ-II:Langmuir Probes

2025-09-29T16:26:12Z

Admin:

TJ-II:Langmuir Probes

2025-09-29T08:04:25Z

Admin:

[[File:TJ-II_Langmuir.png|400px|thumb|right|Location of the reciprocating Langmuir probes at TJ-II]]
[[TJ-II]] has two fast reciprocating drives for [[:Wikipedia:Langmuir probe|Langmuir probes]] (with a displacement velocity of approximately 1 m/s).
<ref>M.A. Pedrosa et al, ''Fast movable remotely controlled Langmuir probe system'', [[doi:10.1063/1.1149350|Rev. Sci. Instrum. '''70''' (1999) 415]]</ref>
<ref>E. Calderón et al, ''On the Influence of Probe Presheath on the Measurement of Fluctuation and E × B Turbulent Transport by Langmuir Probes'', [[doi:10.1002/ctpp.200410104|Contributions to Plasma Physics '''44''', Issue 7-8 (2004) 700 - 704]]</ref>
<ref>M.A. Pedrosa et al, ''Evidence of Long-Distance Correlation of Fluctuations during Edge Transitions to Improved-Confinement Regimes in the TJ-II Stellarator'', [[doi:10.1103/PhysRevLett.100.215003|Phys. Rev. Lett. '''100''' (2008) 215003]]</ref>
Probe drive 1 is located at φ = 38.2°, R=134 cm ([[TJ-II:Sectors|sector]] D4) and probe drive 2 at φ = 195° ([[TJ-II:Sectors|sector]] B2).

== Probe heads ==

Several different heads can be mounted on the reciprocating drives: e.g., staircase Langmuir probes, a rake probe (as of 2009), or a multi-pin Langmuir probe (2010).

{| border="0" style="width:450px;"
|- valign="top"
| [[File:Langmuir_probe_head.gif|200px|thumb|left|Photo of a staircase Langmuir probe head with three sets of measurement pins]]
| [[File:Multipin.jpg|200px|thumb|left|Photo of a multipin Langmuir probe head]]
|-
| [[File:TJ-II_Rake.png|400px|thumb|left|Photo of a 12-pin Langmuir rake probe head]]
| [[File:Probe_8.png|400px|thumb|left|Photo of an 8-pin Langmuir rake probe head]]
|-
| [[File:Vorticity probe.png|400px|thumb|left|Photo of a vorticity probe probe head<ref>D. Carralero Ortiz, ''Electromagnetic Instability Studies in Fusion Plasmas Edge'', [https://oa.upm.es/11485/ PhD thesis, UPM]</ref>]]
|
|}

== See also ==

* [[TJ-II:Limiter|Limiter probes]]
* [[TJ-II:Biasing probe|Biasing probe]]

== References ==
<references />

2025-06-28T06:11:11Z

Admin: /* 2026 */

== Upcoming Fusion and Plasma events ==

Please feel free to add events.

=== 2025 ===

{| class="wikitable" style="width: 100%" border="1"
|-
! scope="col" width="20%" | Date (2025)
! scope="col" width="20%" | Location
! scope="col" width="60%" | Conference/Meeting
|-
| April 23-25 || Albufeira/Algarve, Portugal || [https://www.setcor.org/conferences/plasma-tech-2025 Plasma Processing and Technology International Conference]
|-
| May 18-22 || Eindhoven, The Netherlands || [https://icpdp2025.dryfta.com/ 10th International Conference on the Physics of Dusty Plasmas] (ICPDP)
|-
| June 23-26 || Cambridge, MA, USA || [https://plasmafusion.eventsair.com/sofe2025/ 2025 Symposium on Fusion Engineering]
|-
| July 7-11 || Vilnius, Lithuania || [https://epsplasma2025.com/ 51st EPS Conference on Plasma Physics] (EPS)
|-
| September 9-12 || Budapest, Hungary || [https://ttf2025.ek.hun-ren.hu/ 29th EU-US Transport Task Force Workshop] (TTF)
|-
| September 21-26 || Fukuoka, Japan || [https://www.aappsdpp.org/DPP2025/index.html 9th Asia-Pacific Conference on Plasma Physics] (AAPPS-DPP2025)
|-
| September 23-26 || Aix-en-Provence, France || [https://indico.global/event/13788/ 21st European Fusion Theory Conference] (EFTC)
|-
| October 13-18 || Xi'an, China || 30th IAEA Fusion Energy Conference (IAEA)
|-
| November 9-14 || Knoxville, TN, USA || [https://isfnt-16.ornl.gov/ 16th International Symposium on Fusion Nuclear Technology]
|}

=== 2026 ===

{| class="wikitable" style="width: 100%" border="1"
|-
! scope="col" width="20%" | Date (2026)
! scope="col" width="20%" | Location
! scope="col" width="60%" | Conference/Meeting
|-
| April 20-24 || Córdoba, Spain || [https://ishw2026.com 25th International Stellarator and Heliotron Workshop] (ISHW)
|}

== Periodic meetings ==

The following FusionWiki entries attempt to both provide a record of historic meetings and direct links to proceedings:
* The [[IAEA Fusion Energy Conference]] (FEC)
* The [[European Physical Society Conference on Plasma Physics]] (EPS-CPP)
* The [[European Conference on Plasma Diagnostics]] (ECPD)
* The [[International Congress on Plasma Physics]] (ICPP)
* The [https://engage.aps.org/dpp/meetings/annual-meeting Annual Meeting of the Division of Plasma Physics of the American Physical Society] (APS-DPP)
* The [[International Stellarator and Heliotron Workshop]] (ISHW)
* The [[European Fusion Theory Conference]] (EFTC)
* The [[Conference on Plasma Surface Interactions]] (PSI)
* The [[Symposium on Fusion Technology]] (SOFT)
* The [[Symposium On Fusion Engineering]] (SOFE)
* The [[EU-US Transport Task Force Meeting]] (TTF)
* The [[International Toki Conference]] (ITC)
* The [[Topical Conference on High Temperature Plasma Diagnostics]] (HTPD)
* The [http://www.sherwoodtheory.org/ Sherwood Theory Conference]
* The [[International Conference on Tritium Science and Technology]] (TRITIUM)
* The [[International Symposium on Fusion Nuclear Technology]] (ISFNT)
* The [[Coordinated Working Group Meeting]] (CWGM)
* The [http://varenna-lausanne.epfl.ch/ Theory of Fusion Plasmas: Joint Varenna-Lausanne International Workshop] (Varenna-Lausanne even years)
* The International Conference on Fusion Reactor Materials (ICFRM)

See also [[:Category:Conferences]].

== Meeting lists at other sites ==

* [http://ieee-npss.org/directory-of-plasma-conferences/ IEEE Nuclear and Plasma Sciences Society Directory of Plasma Conferences].
* [https://www.iter.org/conferences Calendar maintained at ITER of upcoming conferences on fusion science, fusion technology, plasma physics and energy].
* [https://www-amdis.iaea.org/w/index.php/Calendar_of_Meetings Calendar maintained by IAEA Atomic and Molecular Data Unit of meetings related to A+M+PMI processes and data for fusion].
* [http://fusenet.eu/events Calendar maintained by the European Fusion Education Network (FuseNet) of upcoming fusion related events].
* [http://crpp.epfl.ch/conferences_e Calendar maintained at Centre de Recherches en Physique des Plasmas, EPFL, of conferences on plasma physics research].
* [http://www.conference-service.com/conferences/plasma-and-gas-discharge-physics.html COMS Conferences and Meetings on Plasma and Gas-discharge Physics].
* [http://fire.pppl.gov/meetings_fusion.htm Calendar maintained at Fire, PPPL, of fusion meetings].
* [http://www.jspf.or.jp/calendar/cldrb.html Plasma and Fusion Calendar maintained by the Japan Society of Plasma Science and Nuclear Fusion Research].
* [https://burningplasma.org/newsandevents/?article=enews&issue=current Calendar maintained by the United States Burning Plasma Organization (USBPO) of fusion energy events].

User:Admin

2025-06-04T05:53:59Z

Admin: /* 2010-2019 */

[[File:BvM.jpg|right|]]
== Personal information ==
__NOTOC__
* Boudewijn van Milligen (Admin)
* Researcher at: [[Laboratorio Nacional de Fusión]] - [[CIEMAT]] Avda. Complutense 40, Edif. 66 28040 Madrid, España - Spain
* Tel. +34 - 914 962 682
* Email boudewijn.vanmilligen (at) ciemat.es
User profiles:
* [https://publons.com/researcher/1248698/boudewijn-ph-van-milligen/ Publons] (ResearcherID H-5121-2015)
* [http://orcid.org/0000-0001-5344-6274 ORCID 0000-0001-5344-6274]
* [https://www.scopus.com/authid/detail.uri?authorId=35476190300 Scopus AuthorID 35476190300]
* [http://scholar.google.com/citations?user=7z9Cr9oAAAAJ Google Scholar]
* [https://www.researchgate.net/profile/Boudewijn_Van_Milligen/ ResearchGate]

== Interests ==

* Fusion and plasma physics
** [[H-mode|L-H transition]], Zonal Flows
** [[Magnetic island]]s, MHD activity
* [[Anomalous transport]]
** Turbulence
** Continuous Time Random Walks
* Data analysis
** [[Causality detection]]
** [[Intermittence]]
** [[:Wikipedia:Rescaled range|Rescaled range]] or [[:Wikipedia:Hurst exponent|Hurst]] analysis
** [[Bayesian data analysis]]
** [[Biorthogonal decomposition]]
** [[Bicoherence]]
** [[TJ-II:Tomography|Tomography]]

== Book ==

B.Ph. van Milligen and R. Sánchez, ''Analysis of Turbulence in Fusion Plasmas'', [[doi:10.1088/978-0-7503-4856-0|IOP Publishing (2022)]], {{ISBN|978-0-7503-4854-6}}

== Selected publications ==

(inverse chronological order)
=== ≥ 2020 ===
* B.Ph. van Milligen, I. García-Cortés, K.J. McCarthy, et al, ''The rotational transform and enhanced confinement in the TJ-II stellarator'', Accepted for publication in Journal of Plasma Physics (2025)
* Boudewijn Philip van Milligen, Teresa Estrada, Benjamin Carreras, Luis García, and TJ-II Team. ''Importance of the Rotational Transform for L–H Transitions in the TJ-II Stellarator'' [[doi:10.3390/plasma7020024|Plasma '''7''', no. 2 (2024) 446-464]] [[File:Open Access Icon.png|10px|link=:Wikipedia:Open_access_(publishing)|Open access]]
* B.Ph. van Milligen, I. Voldiner, B.A. Carreras, L. García, M.A. Ochando and The TJ-II Team, ''Rational surfaces, flows and radial structure in the TJ-II stellarator'', [[doi:10.1088/1741-4326/aca688|Nucl. Fusion '''63''' (2023) 016027]] [[File:Open Access Icon.png|10px|link=:Wikipedia:Open_access_(publishing)|Open access]]
* B.Ph. Van Milligen, B.A. Carreras, L. Garcia, G. Grenfell, I. Voldiner and C. Hidalgo, ''The impact of radial electric fields and plasma rotation on intermittence in TJ-II'', [[doi:10.1088/1361-6587/ac54e9|Plasma Phys. Control. Fusion '''64''', 5 (2022) 055006]] ([http://documenta.ciemat.es/handle/123456789/2290 repository])
* B. van Milligen, A. Melnikov, B. Carreras, L. Garcia, A. Kozachek, C. Hidalgo, J. de Pablos, Ph. Khabanov, L. Eliseev, M. Drabinskij, A. Chmyga, L. Krupnik, the HIBP Team, the TJ-II Team, ''Topology of 2-D turbulent structures based on intermittence in the TJ-II stellarator'', [[doi:10.1088/1741-4326/ac27c9|Nucl. Fusion '''61''', 11 (2021) 116063]] ([http://documenta.ciemat.es/handle/123456789/2281 repository])
* B.Ph. van Milligen, B.A. Carreras, I. Voldiner, U. Losada, C. Hidalgo, and the TJ-II Team, ''Causality, intermittence and crossphase evolution during confinement transitions in the TJ-II stellarator'', [[doi:10.1063/5.0057791|Phys. Plasmas '''28''' (2021) 092302]] ([http://documenta.ciemat.es/handle/123456789/2289 repository])
* B.Ph. van Milligen, B. Carreras, L. García and C. Hidalgo, ''The localization of low order rational surfaces based on the intermittence parameter in the TJ-II stellarator'', [[doi:10.1088/1741-4326/ab79cc|Nucl. Fusion '''60''' (2020) 056010]] ([http://documenta.ciemat.es/handle/123456789/2291 repository])

=== 2010-2019 ===
* B.Ph. van Milligen, B. Carreras, L. García and J. Nicolau, ''The radial propagation of heat in strongly driven non-equilibrium fusion plasmas'', [[doi:10.3390/e21020148|Entropy, '''21''', 2 (2019) 148]] [[File:Open Access Icon.png|10px|link=:Wikipedia:Open_access_(publishing)|Open access]]
* B.Ph. van Milligen, B. Carreras, E. de la Luna and E. Solano, ''Radial variation of heat transport in L-mode JET discharges'' [[doi:10.1088/1741-4326/ab03e1|Nucl. Fusion, '''59''' (2019) 056006]] ([http://documenta.ciemat.es/handle/123456789/2292 repository])
* B.Ph. van Milligen, B.A. Carreras, C. Hidalgo, Á. Cappa and the TJ-II Team, ''A possible mechanism for confinement power degradation in the TJ-II stellarator'', [[doi:10.1063/1.5029881|Phys. Plasmas '''25''' (2018) 062503]] ([http://documenta.ciemat.es/handle/123456789/2308 repository])
* B.Ph. van Milligen, U. Hoefel, J. Nicolau, M. Hirsch, L. García, B. Carreras, C. Hidalgo and the W7-X Team, ''Study of radial heat transport in W7-X using the transfer entropy'', [[doi:10.1088/1741-4326/aabf5d|Nucl. Fusion '''58''' (2018) 076002]] ([http://hdl.handle.net/10016/32565 repository])
* B.Ph. van Milligen, J. Hernández Nicolau, B. Liu, G. Grenfell, U. Losada, B. Carreras, L. Garcia and C. Hidalgo, ''Filaments in the edge confinement region of TJ-II'', [[doi:10.1088/1741-4326/aa9db6|Nucl. Fusion '''58''' (2018) 026030]] ([http://hdl.handle.net/10016/32563 repository])
* B.Ph. van Milligen, J.H. Nicolau, L. García, B.A. Carreras, C. Hidalgo and the TJ-II Team, ''The impact of rational surfaces on radial heat transport in TJ-II'', [[doi:10.1088/1741-4326/aa611f|Nucl. Fusion '''57''', 5 (2017) 056028]], [https://arxiv.org/abs/1701.04574 arxiv:1701.04574]
* B.Ph. van Milligen, T. Estrada, B.A. Carreras, E. Ascasíbar, C. Hidalgo, I. Pastor, J.M. Fontdecaba, R. Balbín and the TJ-II Team, ''The causal impact of magnetic fluctuations in slow and fast L–H transitions at TJ-II'', [[doi:10.1063/1.4958807|Phys. Plasmas '''23''' (2016) 072305]], [https://arxiv.org/abs/1512.06525 arxiv:1512.06525]
* B.Ph. van Milligen, B.A. Carreras, L. García, A. Martín de Aguilera, C. Hidalgo, J.H. Nicolau and the TJ-II Team, ''The causal relation between turbulent particle flux and density gradient'', [[doi:10.1063/1.4958806|Phys. Plasmas '''23''' (2016) 072307]]
* B.Ph. van Milligen, B.A. Carreras and D.E. Newman, ''Constructing criteria to diagnose the likelihood of extreme events in the case of the electric power grid'', [[doi:10.1063/1.4943569|Chaos '''26''' (2016) 033109]]
* B.Ph. van Milligen, T. Estrada, L. García, D. López-Bruna, B. Carreras, Y. Xu, M. Ochando, C. Hidalgo, J. Reynolds-Barredo and A. López-Fraguas, ''The role of magnetic islands in modifying long range temporal correlations of density fluctuations and local heat transport'', [[doi:10.1088/0029-5515/56/1/016013|Nucl. Fusion, '''56''', 1 (2016) 016013]], [https://arxiv.org/abs/1506.06890 arxiv:1506.06890]
* B.Ph. van Milligen, E. Sánchez, A. Alonso, M.A. Pedrosa, C. Hidalgo, A. Martín de Aguilera, A. López Fraguas, ''The use of the Biorthogonal Decomposition for the identification of zonal flows at TJ-II'', [[doi:10.1088/0741-3335/57/2/025005|Plasma Phys. Control. Fusion '''57''', 2 (2015) 025005]], [https://arxiv.org/abs/1408.1845 arxiv:1408.1845]
* B.Ph. van Milligen, P.D. Bons, ''Simplified numerical model for clarifying scaling behavior in the intermediate dispersion regime in homogeneous porous media'', [[doi:10.1016/j.cpc.2014.09.006|Comput. Phys. Commun. '''185''' (2014) 3291]], [https://arxiv.org/abs/1409.2724 arxiv:1409.2724]
* B.Ph. van Milligen, G. Birkenmeier, M. Ramisch, T. Estrada, C. Hidalgo and A. Alonso, ''Causality detection and turbulence in fusion plasmas'', [[doi:10.1088/0029-5515/54/2/023011|Nucl. Fusion '''54''' (2014), 023011]], [https://arxiv.org/abs/1309.7769 arxiv:1309.7769]
* B.Ph. van Milligen et al, ''Parallel and perpendicular turbulence correlation length in the TJ-II Stellarator'', [[doi:10.1088/0029-5515/53/9/093025|Nucl. Fusion '''53''' (2013) 093025]], [https://arxiv.org/abs/1306.1395 arxiv:1306.1395]
* P.D. Bons, B.Ph. van Milligen, P. Blum, ''A general unified expression for solute and heat dispersion in homogeneous porous media'', [[doi:10.1002/wrcr.20488|Water Resour. Res. '''49''' (2013) 1]]
* B.Ph. van Milligen et al, ''Spatiotemporal and wavenumber resolved bicoherence at the low to high confinement transition in the TJ-II stellarator'', [[doi:10.1088/0029-5515/53/11/113034|Nucl. Fusion '''53''' (2013) 113034]], [https://arxiv.org/abs/1211.0420 arxiv:1211.0420]
* B. Ph. van Milligen, R. Sánchez and C. Hidalgo, ''Relevance of Uncorrelated Lorentzian Pulses for the Interpretation of Turbulence in the Edge of Magnetically Confined Toroidal Plasmas'', [[doi:10.1103/PhysRevLett.109.105001|Phys. Rev. Lett. '''109''' (2012) 105001]], [https://arxiv.org/abs/1204.6185 arxiv:1204.6185]
* B.Ph. van Milligen, P.D. Bons, ''Analytical model for tracer dispersion in porous media'', [[doi:10.1103/PhysRevE.85.011306|Phys. Rev. E 85 (2012) 011306]], [https://arxiv.org/abs/1111.6512 arxiv:1111.6512]
* B.Ph. van Milligen, L. García, B.A. Carreras, M.A. Pedrosa, C. Hidalgo, J.A. Alonso, T. Estrada and E. Ascasíbar, ''MHD mode activity and the velocity shear layer at TJ-II'', [[doi:10.1088/0029-5515/52/1/013006|Nucl. Fusion '''52''' (2012) 013006]]
* B.Ph. van Milligen, T. Estrada, E. Ascasíbar, et al, ''Integrated data analysis at TJ-II: the density profile'', [[doi:10.1063/1.3608551|Rev. Sci. Instrum. '''82''' (2011) 073503]]
* B.A. Carreras et al., ''Reconstruction of intermittent waveforms associated with the zonal flow at the transition leading to the edge shear flow layer'', [[doi:10.1088/0029-5515/51/5/053022|Nucl. Fusion '''51''' (2011) 053022]]
* B.Ph. van Milligen et al, ''A global resonance phenomenon at the TJ-II stellarator'', [[doi:10.1088/0029-5515/51/1/013005|Nucl. Fusion '''51''' (2011) 013005]]
* B.Ph. van Milligen et al, ''The dynamics of the formation of the edge particle transport barrier at TJ-II'', [[doi:10.1088/0029-5515/51/11/113002|Nucl. Fusion '''51''' (2011) 113002]]

=== 2000-2009 ===
* B.Ph. van Milligen, I. Calvo and R. Sánchez, ''Continuous time random walks in finite domains and general boundary conditions: some formal considerations'', [[doi:10.1088/1751-8113/41/21/215004|J. Phys. A: Math. Theor. '''41''' (2008) 215004]]
* B.Ph. van Milligen et al, ''Quantifying profile stiffness'', [http://www.jspf.or.jp/PFR/PFR_articles/pfr2008S1/pfr2008_03-S1070.html Plasma and Fusion Research, '''3''' (2008) S1070]
* B.Ph. van Milligen et al, ''Bicoherence during confinement transitions in the TJ-II stellarator'', [[doi:10.1088/0029-5515/48/11/115003|Nucl. Fusion '''48''' (2008) 115003]]
* B.Ph. van Milligen, B.A. Carreras, V.E. Lynch and R. Sánchez, ''Pulse propagation in a simple probabilistic transport model'', [[doi:10.1088/0029-5515/47/3/004|Nucl. Fusion '''47''' (2007) 189]]
* B.Ph. van Milligen, P.D. Bons, B.A. Carreras and R. Sánchez, ''On the applicability of Fick's Law to diffusion in inhomogeneous systems'', [[doi:10.1088/0143-0807/26/5/023|Eur. J. Phys. '''26''' (2005) 913]]
* B.Ph. van Milligen, B.A. Carreras and R. Sánchez, ''The foundations of diffusion revisited'', [[doi:10.1088/0741-3335/47/12B/S56|Plasma Phys. Control. Fusion '''47''' (2005) B743]]
* B.Ph. Van Milligen et al, ''Additional evidence for the universality of turbulent fluctuations and fluxes in the scrape-off layer region of fusion plasmas'', [[doi:10.1063/1.1884615|Phys. Plasmas '''12''' (2005) 052507]]
* B.Ph. van Milligen, R. Sánchez and B.A. Carreras, ''Probabilistic finite-size transport models for fusion: anomalous transport and scaling laws'', [[doi:10.1063/1.1701893|Phys. Plasmas '''11''', 5 (2004) 2272]]
* B.Ph. van Milligen, B.A. Carreras and R. Sánchez, ''Uphill transport and the probabilistic transport model'', [[doi:10.1063/1.1763915|Phys. Plasmas '''11''', 3787 (2004)]]
* B.Ph. van Milligen et al, ''Revision of TV Thomson scattering data analysis and detection of profile structure'', [[doi:10.1063/1.1597951|Rev. Sci. Instrum. '''74''' (2003) 3998]]
* B.Ph. van Milligen, E. de la Luna, F.L. Tabarés, et al., ''Ballistic transport phenomena in TJ-II'', [[doi:10.1088/0029-5515/42/7/301|Nucl. Fusion '''42''' (2002) 787]]
=== 1990 - 1999 ===
* B.A. Carreras, B.Ph. van Milligen, et al, ''Experimental evidence of long-range correlation and self-similarity in plasma fluctuations'', [[doi:10.1063/1.873490|Phys. Plasmas '''6''', 5 (1999) 1885]]
* B.Ph. van Milligen et al, ''Statistically robust linear and non-linear wavelet analysis applied to plasma edge turbulence'', [[doi:10.1063/1.1147727|Rev. Sci. Instrum. '''68''' (1997) 967]]
* B.Ph. van Milligen, V. Tribaldos, J.A. Jiménez, ''A neural network differential equation and plasma equilibrium solver'', [[doi:10.1103/PhysRevLett.75.3594|Phys. Rev. Lett. '''75''' (1995) 3594]]
* B.Ph. van Milligen et al, ''Nonlinear phenomena and intermittency in plasma turbulence'', [[doi:10.1103/PhysRevLett.74.395|Phys. Rev. Lett. '''74''', 3 (1995) 395]]
* B.Ph. van Milligen et al, ''Wavelet bicoherence: a new turbulence analysis tool'', [[doi:10.1063/1.871199|Phys. Plasmas '''2''', 8 (1995) 3017]]
* B.Ph. van Milligen and A. Lopez Fraguas, ''Expansion of vacuum magnetic fields in toroidal harmonics'', [[doi:10.1016/0010-4655(94)90112-0|Comput. Phys. Commun. '''81''', Issues 1-2 (1994) 74-90]]
* B.Ph. van Milligen, A.C.A.P. van Lammeren, N.J. Lopes Cardozo, F.C. Schüller and M. Verreck, ''Gradients of electron temperature and density across m=2 islands in RTP'', [[doi:10.1088/0029-5515/33/8/I03|Nucl. Fusion '''33''' (1993) 1119]]
* B.Ph. van Milligen, N.J. Lopes Cardozo, ''Function Parametrization: a fast inverse mapping method'', [[doi:10.1016/0010-4655(91)90073-T|Comput. Phys. Commun. '''66''' (1991) 243]]
* B.Ph. van Milligen et al., ''Application of Function Parametrization to the analysis of polarimetry and interferometry data in TEXTOR'', [[doi:10.1088/0029-5515/31/2/007|Nucl. Fusion '''31''' (1991) 309]]
* B.Ph. van Milligen, ''Exact relations between multipole moments of the flux and moments of the toroidal current density in tokamaks'', [[doi:10.1088/0029-5515/30/1/012|Nucl. Fusion '''30''' (1990) 157]]