Comparative investigation of ELM control based on toroidal modelling of plasma response to RMP fields
Extensive modelling efforts of the plasma response to the resonant magnetic perturbation fields, utilized for controlling the edge localized mode (ELM), help to identify the edge-peeling response as a key factor, which correlates to the observed ELM mitigation in several tokamak devices, including M...
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Veröffentlicht in: | Physics of plasmas 2017-05, Vol.24 (5) |
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Hauptverfasser: | , , , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Extensive modelling efforts of the plasma response to the resonant magnetic perturbation
fields, utilized for controlling the edge localized mode
(ELM), help to
identify the edge-peeling response as a key factor, which correlates to the observed
ELM mitigation
in several tokamak devices, including MAST, ASDEX Upgrade, EAST, and HL-2A. The recently
observed edge safety factor window for ELM mitigation in HL-2A experiments is explained in
terms of the edge-peeling response. The computed plasma response, based on toroidal single fluid resistive plasma model
with different assumption of toroidal
flows, is
found generally larger in ELM suppressed cases as compared to that of the ELM mitigated cases, in ASDEX
Upgrade and DIII-D. The plasma shaping, in particular, the plasma triangularity,
contributes to the enhanced plasma response. But the shaping does not appear to be the
sole factor—other factors such as the (higher) pedestal pressure and/or current can
also lead to increased edge-peeling response. |
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ISSN: | 1070-664X 1089-7674 1089-7674 |
DOI: | 10.1063/1.4978884 |