Suppression and mitigation of inter-ELM high-frequency Alfvén-like mode by resonant magnetic perturbation in EAST

Jiquan ZHAO (赵济全); Youwen SUN (孙有文); Nan CHU (楚南); Tonghui SHI (石同辉); Qun MA (马群); Yumin WANG (王嵎民); Kaiyang HE (何开洋); Youjun HU (胡友俊); EAST Team

doi:10.1088/2058-6272/ac06b8

Plasma Science and Technology > 2021 > 23(9): 95101-095101. > DOI: 10.1088/2058-6272/ac06b8

Jiquan ZHAO (赵济全), Youwen SUN (孙有文), Nan CHU (楚南), Tonghui SHI (石同辉), Qun MA (马群), Yumin WANG (王嵎民), Kaiyang HE (何开洋), Youjun HU (胡友俊), EAST Team. Suppression and mitigation of inter-ELM high-frequency Alfvén-like mode by resonant magnetic perturbation in EAST[J]. Plasma Science and Technology, 2021, 23(9): 95101-095101. DOI: 10.1088/2058-6272/ac06b8

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Suppression and mitigation of inter-ELM high-frequency Alfvén-like mode by resonant magnetic perturbation in EAST

¹ Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
² University of Science and Technology of China, Hefei 230026, People's Republic of China

Funds: This work is supported by the National Key R&D Program of China (No. 2017YFE0301100) and National Natural Science Foundation of China (No. 11 875 292).

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Received Date: March 29, 2021
Revised Date: May 27, 2021
Accepted Date: May 30, 2021

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Abstract

Abstract

Suppression and mitigation of a high-frequency Alfvén-like mode (HFAM) between type-I edge localized modes (ELMs) during ELM mitigation by resonant magnetic perturbation (RMP) is observed for the first time in the EAST tokamak. This mode is located near the edge pedestal region. The modeling result of the Alfvén continuum shows that the HFAM is located near the elipical Alfvén eigenmode (EAE) gap. During the application of n = 1 RMP for ELM mitigation, the HFAM can be fully suppressed when the RMP amplitude exceeds a threshold, below which the HFAM is mitigated. The suppression is caused by a reduction of pedestal height induced by RMP. In the case using n = 3 RMP, the mode is localized toroidally at specific phase depending on the phase of applied RMP, i.e. locked in the three-dimensional equilibrium formed by RMP. The dominant toroidal mode number of HFAM is around n = −6 and it reduces to −3 during the application of n = 3 RMP, which indicates the existence of possible nonlinear coupling between the HFAM and RMP. Here the negative mode number denotes that the mode rotates in electron diamagnetic drift direction. The observation reported here improves the understanding of pedestal dynamics and its stability in RMP ELM control.
- Alfvén-like mode,
- RMP,
- HFAM mode,
- inter-ELM

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1.	Deng, R., Ming, T., Li, B. et al. VUV imaging of type-I ELM filamentary structures and their temporal characteristics on EAST. Plasma Science and Technology, 2024, 26(11): 114002. DOI:10.1088/2058-6272/ad621c
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Suppression and mitigation of inter-ELM high-frequency Alfvén-like mode by resonant magnetic perturbation in EAST