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

doi:10.1088/2058-6272/ac06b8

	Suppression and mitigation of inter-ELM high-frequency Alfvén-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 and Technology
	2021-07-23
卷号	23
关键词	Alfvén-like mode RMP HFAM mode inter-ELM
ISSN号	1009-0630
DOI	10.1088/2058-6272/ac06b8
通讯作者	ZHAO,Jiquan()
英文摘要	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.
语种	英语
出版者	IOP Publishing
WOS记录号	IOP:1009-0630-23-9-AC06B8
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/123976]
专题	中国科学院合肥物质科学研究院
通讯作者	ZHAO,Jiquan
作者单位	1.University of Science and Technology of China, Hefei 230026, People's Republic of China 2.Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of 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 Alfvén-like mode by resonant magnetic perturbation in EAST[J]. Plasma Science and 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 Alfvén-like mode by resonant magnetic perturbation in EAST.Plasma Science and Technology,23.
MLA	ZHAO,Jiquan,et al."Suppression and mitigation of inter-ELM high-frequency Alfvén-like mode by resonant magnetic perturbation in EAST".Plasma Science and Technology 23(2021).