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

doi:10.1088/2058-6272/ac06b8

	Suppression and mitigation of inter-ELM high-frequency Alfven-like mode by resonant magnetic perturbation in EAST
	Zhao, Jiquan 1,2; Sun, Youwen 2; Chu, Nan 1,2; Shi, Tonghui 2; Ma, Qun 1,2; Wang, Yumin 2; He, Kaiyang 1,2; Hu, Youjun 2
刊名	PLASMA SCIENCE & TECHNOLOGY
	2021-09-01
卷号	23
关键词	Alfven-like mode RMP HFAM mode inter-ELM
ISSN号	1009-0630
DOI	10.1088/2058-6272/ac06b8
通讯作者	Sun, Youwen(ywsun@ipp.ac.cn)
英文摘要	Suppression and mitigation of a high-frequency Alfven-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 Alfven continuum shows that the HFAM is located near the elipical Alfven 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.
资助项目	National Key R&D Program of China[2017YFE0301100] ; National Natural Science Foundation of China[11 875 292]
WOS研究方向	Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000676023000001
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/123257]
专题	中国科学院合肥物质科学研究院
通讯作者	Sun, Youwen
作者单位	1.Univ Sci & Technol China, Hefei 230026, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, HFIPS, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Jiquan,Sun, Youwen,Chu, Nan,et al. Suppression and mitigation of inter-ELM high-frequency Alfven-like mode by resonant magnetic perturbation in EAST[J]. PLASMA SCIENCE & TECHNOLOGY,2021,23.
APA	Zhao, Jiquan.,Sun, Youwen.,Chu, Nan.,Shi, Tonghui.,Ma, Qun.,...&Hu, Youjun.(2021).Suppression and mitigation of inter-ELM high-frequency Alfven-like mode by resonant magnetic perturbation in EAST.PLASMA SCIENCE & TECHNOLOGY,23.
MLA	Zhao, Jiquan,et al."Suppression and mitigation of inter-ELM high-frequency Alfven-like mode by resonant magnetic perturbation in EAST".PLASMA SCIENCE & TECHNOLOGY 23(2021).