FoSS: ISHW2024 - Revision history

Smoniewski: add link to FoSS

2024-10-29T13:37:49Z

add link to FoSS

← Older revision		Revision as of 15:37, 29 October 2024
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	The 1st meeting of the Forum of Small Stellarators (1st Uncoordinated Working Group Meeting) took place as a satellite meeting to the 24th ISHW in Hiroshima, Japan on 12 September, 2024.		The 1st meeting of the [[Forum of Small Stellarators]] (1st Uncoordinated Working Group Meeting) took place as a satellite meeting to the 24th ISHW in Hiroshima, Japan on 12 September, 2024.

	== Agenda ==		== Agenda ==

Smoniewski: /* training */

2024-10-29T13:35:52Z

training

← Older revision		Revision as of 15:35, 29 October 2024
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	*** if also standardized, could have a common web interface for multiple devices (proposed by Y. Suzuki)		*** if also standardized, could have a common web interface for multiple devices (proposed by Y. Suzuki)
	*** suggest a workshop or bootcamp for development of the interface		*** suggest a workshop or bootcamp for development of the interface
			* any workshop by the Forum should probably have a strong education aspect

	=== configuration design / physics investigations ===		=== configuration design / physics investigations ===

Smoniewski: /* Discussion */

2024-10-29T13:32:33Z

Discussion

← Older revision		Revision as of 15:32, 29 October 2024
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	== Discussion ==		== Discussion ==

			=== training ===
			* training students is a very important and common motivation
			* as part of coursework, project management and teamwork can also be trained
			* with so many small devices, we should consider collaboration as an important aspect of training
			* interest in an arduino-mentality stellarator kit (proposed by F. Volpe)
			** standardize a kit to make startup easy, but allow for flexibility
			** would be good for exporting stellarators to places with a limited budget, engineering groups without the physics support
			* related motivation: outreach
			** can we develop some interesting experiments/experiences ?
			** moving coils around ? moving a permanent magnet around ?
			** something like [https://scied-web.pppl.gov/rgdx/ RGDX at PPPL] ?
			*** web-browser-based control system, providing an experiment remotely
			*** if also standardized, could have a common web interface for multiple devices (proposed by Y. Suzuki)
			*** suggest a workshop or bootcamp for development of the interface

			=== configuration design / physics investigations ===
			* small devices are test bed for integrated design, single-stage optimization
			* configuration exploration ? QA, QH, QP, QI, tokamak, RFP ?
			** benefits of some good configurations are not trivial to demonstrate at small size when collisionally dominated
			** can look at electrons at low pressure, demonstrate drift effects
			* turbulence studies, zonal flows
			** don't need a big machine, just a big gradient. Columbia had a 10cm linear device doing ITG studies. They had the advantage of open field lines. What are stellarator options to create a large gradient ?
			** see validation work at TJ-K. also turbulence work at TORPEX.
			** small devices are often studying interchange turbulence. interactions of interchange with energetic particles could be interesting.
			** also should look at validation of fluid turbulence codes
			* fast particle transport, if can inject dimensionally correct electrons ?
			* validate neoclassical flow damping
			* explore boundaries of MHD stability
			* what is the value of long discharges in small devices ?
			* the renormalization parameter in ISS04 hides the physics of deviation from the trend. a greater variety of devices in the database, even at lower performance, could provide this missing information.
			* small devices are challenged by background neutral gas. can we make this an advantage ? some sort of plasma-neutral interaction study ? atomic physics ?
			** but we don't need a stellarator to study the atom

			=== diagnostics ===
			* variety of diagnostics already being used on small stellarators, some of which are also suitable for fusion plasmas
			** field line mapping common to all devices
			** probe access is particularly good on small devices
			** spectrometers
			** magnetic diagnostics
			** imaging
			* what is the typical budget for diagnostics ?
			** wide range, but often zero. they are secondary to an operating device
			* consider shared diagnostics ?
			** we are happy to get old diagnostics from other machines !
			** sharing diagnostics often comes with a lot of paperwork. its not easy to share a fast camera or oscilloscope. but sharing a probe head is easy.
			** you need a human to operate diagnostics. it is a natural area for people exchange
			** simplest way to get started is to share information. start with sharing how to make diagnostics and how to analyze.
			** Forum activity could be to create diagnostic kits. include information, part list, instructions for assembly, tools for analysis. then share people for expertise.
			* what is used for data management at small devices ? MDSplus ?
			** often use custom format, manual data management
			** may be an area for collaboration. standardized data access would facilitate cross-machine comparisons

			=== plasma generation ===
			* can be expensive, but often determines physics capability of device
			* radio frequency: can be used for microwave studies, mode conversion, current drive, generation of high-energy electrons ?
			* helicon
			* electric discharge ?
			* MUSE puts a tesla coil outside the vessel, a fun method for outreach physics experiments with a glass vessel
			* consider non-neutral plasma, easy to generate

Smoniewski: Page creation

2024-10-25T15:12:15Z

Page creation

New page

The 1st meeting of the Forum of Small Stellarators (1st Uncoordinated Working Group Meeting) took place as a satellite meeting to the 24th ISHW in Hiroshima, Japan on 12 September, 2024.

== Agenda ==
* Welcome and introduction
* ~ 1.5 hours for group introduction presentations. These should be 2-3 slide, <5 minute presentations that provide a brief project overview and any particular strategies to being relevant although small. Each will be followed by 5 minutes of questions / discussion.
** STAR_Lite, Hampton University
** Polaris, École Polytechnique Fédérale de Lausanne
** CSX, Columbia University
** ETOS, University of Wisconsin-Madison
** TJ-K, Universität Stuttgart
** ALPES, Technische Universität Graz
** University of Science and Technology of China
** EPOS, Max-Planck-Institut für Plasmaphysik, Garching
** HU-Heliac, Hiroshima University
** MUSE, Princeton Plasma Physics Laboratory
** Renaissance Fusion
** Heliotron-DR, Kyoto University
* ~ 30 minutes for a coffee break. Opportunity for continuing discussions and engineering questions that are not of general interest.
* ~ 1 hour for brainstorming small stellarator physics investigations and possible joint experiments.

== Discussion ==