Filaments as the origin of HHFW losses in NSTX

W. Tierens; R. Bilato; N. Bertelli; S. Shiraiwa; J. Myra; L. Colas

doi:10.1063/5.0162406

Filaments as the origin of HHFW losses in NSTX

W. Tierens, R. Bilato, N. Bertelli, S. Shiraiwa, J. Myra, L. Colas

Research output: Contribution to journal › Conference article › peer-review

1 Scopus citations

Abstract

In this work we discuss a recent explanation for the observed edge losses during High Harmonic Fast Wave (HHFW) heating and current drive in NSTX. According to our explanation, the edge losses are due to the resonant excitation of surface waves which flow in the parallel direction along naturally occurring density filaments in the edge plasma. Going beyond the approximations of earlier work [1], we discuss additional complexities which arise in a full-wave description of the surface wave dispersion relation, and the possible, if in our opinion unlikely, relevance of this loss mechanism outside of the HHFW regime.

Original language	English
Article number	030006
Journal	AIP Conference Proceedings
Volume	2984
Issue number	1
DOIs	https://doi.org/10.1063/5.0162406
State	Published - Aug 18 2023
Externally published	Yes
Event	24th Topical Conference on Radio-frequency Power in Plasmas - Annapolis, United States Duration: Sep 26 2022 → Sep 28 2022

Funding

This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. This work was supported by a U.S.Department of Energy (DOE) Scientific Discovery through Advanced Computing Initiative Contract Number DESC0018090 and the U.S. DOE under DE-AC02-CH0911466. In addition, this research used resources of the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility operated under Contract No. DE-AC02-05CH11231. J.R. Myra was supported by the US Department of Energy Office of Science, Office of Fusion Energy Sciences under award number DE-AC05-00OR22725/4000158507.

Funders	Funder number
U.S. Department of Energy	DESC0018090, DE-AC02-CH0911466
Office of Science	DE-AC02-05CH11231
Fusion Energy Sciences	DE-AC05-00OR22725/4000158507
European Commission	101052200 — EUROfusion

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abstract = "In this work we discuss a recent explanation for the observed edge losses during High Harmonic Fast Wave (HHFW) heating and current drive in NSTX. According to our explanation, the edge losses are due to the resonant excitation of surface waves which flow in the parallel direction along naturally occurring density filaments in the edge plasma. Going beyond the approximations of earlier work [1], we discuss additional complexities which arise in a full-wave description of the surface wave dispersion relation, and the possible, if in our opinion unlikely, relevance of this loss mechanism outside of the HHFW regime.",

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AU - Tierens, W.

AU - Bilato, R.

AU - Bertelli, N.

AU - Shiraiwa, S.

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AU - Colas, L.

PY - 2023/8/18

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Filaments as the origin of HHFW losses in NSTX

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