Experimental investigation of electromagnetic GAMs under the influence of 3D magnetic topological structure in EAST

doi:10.1088/1361-6587/ac5a0c

	Experimental investigation of electromagnetic GAMs under the influence of 3D magnetic topological structure in EAST
	Qu, H.1; Kong, D. F.1,2; Xu, M.2; Liu, A. D.3; Liang, Y. F.2; Zhang, S. B.2; Cai, H. S.3; Qiu, Z. Y.4; Chen, W.5; Shi, T. H.2
刊名	PLASMA PHYSICS AND CONTROLLED FUSION
	2022-05-01
卷号	64
关键词	GAM magnetic islands locked modes
ISSN号	0741-3335
DOI	10.1088/1361-6587/ac5a0c
通讯作者	Kong, D. F.(dfkong@ipp.ac.cn) ; Xu, M.(mxu@ipp.ac.cn)
英文摘要	The relationship between geodesic acoustic modes (GAMs) and tearing modes (TMs), or locked modes (LMs), have been investigated in EAST. Firstly, multi-branch electromagnetic GAMs are observed synchronously after the excitation of TMs. Broadened radial coverage is observed for these branches, and these frequencies can be described by the dispersion relation of GAM. Secondly, multi-branch electromagnetic GAMs are generated after the excitation of LMs. The toroidal asymmetric structure of GAMs is excited due to the existence of 3D intrinsic error fields, and the radial distribution of those branches is altered accordingly. Four branches of electromagnetic GAMs are observed in the region that is closer to the 'X' -point of the locked magnetic islands, which should be merged into two branches for the region that is closer to the 'O' -point, as confirmed by XUV array measurement. Thirdly, a similar phenomenon is reproduced by the modulation of resonant magnetic perturbation (RMP). The frequency of GAM increases with the current of the RMP coils, and multi-branches of similar modes are generated when the current achieves I-RMP = 2.5 kA, where the electrostatic and electromagnetic components are altered accordingly. The features of those branches are modulated by the rotation of the RMP. Therefore, the structures of the pair of GAMs can be different, which should be influenced by the different magnetic topological structure.
资助项目	National Nature Science Foundation of China[11975267] ; National Nature Science Foundation of China[U1967206] ; National Key Research and Development Program of China[2017YFE0300501] ; National Key Research and Development Program of China[2018YFE0304100] ; Institute of Energy, Hefei Comprehensive National Science Center[19KZS205] ; Institute of Energy, Hefei Comprehensive National Science Center[21KZS202] ; Institute of Energy, Hefei Comprehensive National Science Center[21KZS208] ; International Partnership Program of the Chinese Academy of Sciences[Y16YZ17271] ; Users with Excellence Program of Hefei Science Center CAS[2020HSC-UE008]
WOS关键词	GEODESIC-ACOUSTIC-MODE ; TOKAMAK
WOS研究方向	Physics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000777806600001
资助机构	National Nature Science Foundation of China ; National Key Research and Development Program of China ; Institute of Energy, Hefei Comprehensive National Science Center ; International Partnership Program of the Chinese Academy of Sciences ; Users with Excellence Program of Hefei Science Center CAS
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/128657]
专题	中国科学院合肥物质科学研究院
通讯作者	Kong, D. F.; Xu, M.
作者单位	1.Hefei Comprehens Natl Sci Ctr, Inst Energy, Hefei 230031, Peoples R China 2.Chinese Acad Sci ASIPP, Inst Plasma Phys, Hefei 230031, Peoples R China 3.Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230026, Anhui, Peoples R China 4.Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China 5.Southwestern Inst Phys, POB 432, Chengdu 610041, Peoples R China
推荐引用方式 GB/T 7714	Qu, H.,Kong, D. F.,Xu, M.,et al. Experimental investigation of electromagnetic GAMs under the influence of 3D magnetic topological structure in EAST[J]. PLASMA PHYSICS AND CONTROLLED FUSION,2022,64.
APA	Qu, H..,Kong, D. F..,Xu, M..,Liu, A. D..,Liang, Y. F..,...&Gong, X. Z..(2022).Experimental investigation of electromagnetic GAMs under the influence of 3D magnetic topological structure in EAST.PLASMA PHYSICS AND CONTROLLED FUSION,64.
MLA	Qu, H.,et al."Experimental investigation of electromagnetic GAMs under the influence of 3D magnetic topological structure in EAST".PLASMA PHYSICS AND CONTROLLED FUSION 64(2022).