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== Experimental campaign ==
== Experimental campaign ==
2018 Autumn
Spring 2022


== Proposal title ==
== Proposal title ==
'''Pellet Injections into TJ-II plasmas with core fast electron population'''
'''Enter Title here'''


== Name and affiliation of proponent ==
== Name and affiliation of proponent ==
Kieran J. McCarthy, LNF, Ciemat
Enter name, affiliation and ORCID code here


== Details of contact person at LNF (if applicable) ==
Suggested format:
Enter contact person here or N/A


== Description of the activity, including motivation/objectives and experience of the proponent (typically one-two pages)==
[https://orcid.org/0000-0000-0000-0000 John Doe], University of Ivory Tower
The influence of fast electrons, that reside in the plasma core of TJ-II, on pellet ablation and fuelling efficiency is a topic that was recently highlighted.<ref>K. J. McCarthy et al., Nucl. Fusion 57 056039 (2018)</ref> The work reported therein was part of the current effort to benchmark the stellarator versions of the pellet simulation codes HPI2 for TJ-II and W7-X.<ref>N. Panadero et al, Nucl. Fusion 58 026025 (2017)</ref> It was found that simulations made using the stellarator-adapted version of the HPI2 code did not fully agree with experimental observations for plasmas with a significant population of fast electrons in the core. While the presence of such a population gives rise to local enhanced pellet ablation it also appears to modify the fast outwards drifting of pellet particles and thereafter particle deposition and fuelling efficiency.<ref>K. J. McCarthy et al., accepted in Plasma Phys. Control. Fusion (2018)</ref> In particular, increased electron deposition was observed when an injected pellet undergoes increased ablation in the core due to such electrons. Assuming that the fast electron population does not modify strongly the magnetic configuration it is hypothesized that this observation could be due to subtle modifications in the ablation phase, the plasmoid drift phase. the pellet particle deposition phase and/or the post-deposition transport phase of the pellet injection process. It is considered that the contribution of the first of these phases, i.e., ablation, may be minor, therefore it remains to closely evaluate the other phases. In order to help understand this, it is intended to perform injections into #41777-like (with fast electrons) and #44614-like (no fast electrons) discharges to determine if the outward plasmoid drift significantly changes between these two scenarios. For this the fast-frame camera will be critical. The outcome of these experiments will be used to include a routine in the HPI2 code to account for such situations. For this, it will be attempted to simulate the fast-electron observations with the HPI2 code by modifying the contribution of the drift effect until agreement is reached.


== If applicable, International or National funding project or entity ==
== Details of contact person at LNF ==
PN FIS2017-89326-R
If applicable, enter contact person here or write N/A
 
== Description of the activity ==
 
=== Motivation and Background ===
Basic information to understand the relevance of the proposed experiments in the bigger context of fusion plasma research. You can use references, e.g, <ref>A. Einstein, Journal of Exceptional Results (2017)</ref>.
 
=== Proposal Objectives ===
Specific objetives of this proposal within the context provided in Motivation and Background.
 
=== Approach and Methodology ===
Basic description of the experimental approach to meet the proposal objectives (e.g. parameter scans, configuration variation, operation schemes).
 
== International or National funding project or entity ==
Include funding here (grants, national plans)


== Description of required resources ==
== Description of required resources ==
Required resources:
Required resources:
* Number of plasma discharges or days of operation:  
* Number of plasma discharges or days of operation:  
* Essential diagnostic systems:
* Essential diagnostic systems (without which, the proposal cannot be conducted):
* Type of plasmas (heating configuration):
* Other diagnostic system of special interest:
* Type of plasmas (heating and magnetic configuration):
* Specific requirements on wall conditioning if any:
* Specific requirements on wall conditioning if any:
* External users: need a local computer account for data access: yes/no
* External users: need a local computer account for data access: yes/no
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== Preferred dates and degree of flexibility ==
== Preferred dates and degree of flexibility ==
Preferred dates: (format dd-mm-yyyy)
Preferred dates: (format dd-mm-yyyy)
(If remote participation is required or preferred, please, indicate it here. A Zoom connection with the local contact person will be arranged on the day of experiments.)
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== References ==
== References ==
<references /> <!-- DO NOT REMOVE THIS LINE OR YOU WON'T BE ABLE TO INCLUDE REFERENCES -->
<references />  


<hr> <!-- DO NOT REMOVE THE FOLLOWING LINES OR YOU WON'T APPEAR IN THE EXPERIMENT LISTS -->
<hr>
[[TJ-II:Experimental proposals|Back to list of experimental proposals]]
[[TJ-II:Experimental proposals|Back to list of experimental proposals]]


[[Category:TJ-II internal documents]]
[[Category:TJ-II internal documents]]
[[Category:TJ-II experimental proposals Autumn 2018]]
[[Category:TJ-II experimental proposals Spring 2022]]
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