Multiple Alfven eigenmodes induced by energetic electrons and nonlinear mode couplings in EAST radio-frequency heated H-mode plasmas

doi:10.1088/1741-4326/abd7b9

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	Multiple Alfven eigenmodes induced by energetic electrons and nonlinear mode couplings in EAST radio-frequency heated H-mode plasmas
	Zhao, N.1,2; Bao, J.3; Chen, W.4; Shi, T. H.5; Wang, Z. X.6; Yan, N.5 ; Liu, S. C.5; Liu, H. Q.5; Zang, Q.1,5 ; Lin, S. Y.5; Wu, X. H.5; Chu, Y. Q.5; Wang, Y. M.5; Wang, S. X.5; Hu, W. H.5; Chu, N.5 ; Li, M. H.5; Zhai, X. M.5; Jie, Y. X.5; Jiang, M.4; Lin, X. D.1; Gao, X.1,5
	2021-04-01
发表期刊	NUCLEAR FUSION
ISSN	0029-5515
通讯作者	Chen, W.(chenw@swip.ac.cn)
摘要	Multiple electromagnetic coherent modes with frequencies f similar to 20-300 kHz and toroidal mode numbers n = 1 and n = 2 have been observed and investigated in radio-frequency heated H-mode plasmas of the EAST tokamak. The experimental results show that the two main branches of these coherent modes are driven by energetic electrons (EEs), which are produced in the processes of radio-frequency current drive and heating. Bicoherence analysis indicates that there are strong nonlinear mode interactions between the two branches (mother waves), i.e. one is in the low-frequency range of f similar to 20-50 kHz and the other one is in the high-frequency range of f similar to 120-250 kHz, and their nonlinear couplings can generate many harmonics (daughter waves). Both coherent modes propagate poloidally along the electron diamagnetic drift direction. The gyrokinetic eigenvalue simulations support the view that both the low-frequency and the high-frequency coherent modes observed in EAST are Alfven eigenmode (AE) type, and the kinetic effects of background plasmas and EEs are responsible for the formation and excitation of AEs, respectively. The low-frequency coherent mode is identified as the kinetic beta-induced Alfven eigenmode located in the edge, and the high-frequency coherent mode is radially global, which is characterized by a toroidal Alfven eigenmode (TAE) in the core and also has the components of a kinetic TAE and ellipticity-induced Alfven eigenmode in the outer region due to the large downshift of the Alfven continuum gap from the core to the edge in H-mode discharges.
关键词	Alfvé n eigenmodes nonlinear mode coupling energetic electrons
DOI	10.1088/1741-4326/abd7b9
收录类别	SCI
语种	英语
资助项目	National Nature Science Foundation of China[11875021] ; National Nature Science Foundation of China[11975275] ; National Nature Science Foundation of China[U19A20113] ; National Nature Science Foundation of China[11875294] ; Shenzhen Clean Energy Research Institute
项目资助者	National Nature Science Foundation of China ; Shenzhen Clean Energy Research Institute
WOS研究方向	Physics
WOS类目	Physics, Fluids & Plasmas
WOS记录号	WOS:000629141800001
出版者	IOP PUBLISHING LTD
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/120851
专题	中国科学院合肥物质科学研究院
通讯作者	Chen, W.
作者单位	1.Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Peoples R China 2.Shenzhen Univ, Coll Optoelect Engn, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst, Shenzhen 518060, Peoples R China 3.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China 4.Southwestern Inst Phys, POB 432, Chengdu 610041, Peoples R China 5.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China 6.Dalian Univ Technol, Sch Phys, Minist Educ, Key Lab Mat Modificat Laser Ion & Electron Beams, Dalian 116024, Peoples R China
推荐引用方式 GB/T 7714	Zhao, N.,Bao, J.,Chen, W.,et al. Multiple Alfven eigenmodes induced by energetic electrons and nonlinear mode couplings in EAST radio-frequency heated H-mode plasmas[J]. NUCLEAR FUSION,2021,61.
APA	Zhao, N..,Bao, J..,Chen, W..,Shi, T. H..,Wang, Z. X..,...&Gao, X..(2021).Multiple Alfven eigenmodes induced by energetic electrons and nonlinear mode couplings in EAST radio-frequency heated H-mode plasmas.NUCLEAR FUSION,61.
MLA	Zhao, N.,et al."Multiple Alfven eigenmodes induced by energetic electrons and nonlinear mode couplings in EAST radio-frequency heated H-mode plasmas".NUCLEAR FUSION 61(2021).