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

doi:10.1088/1741-4326/abd7b9

HFCAS OpenIR

	Multiple Alfvén 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.1,5; Jiang,M.4; Lin,X.D.1; Gao,X.1,5; the EAST Team,5
	2021-03-08
发表期刊	Nuclear Fusion
ISSN	0029-5515
摘要	AbstractMultiple electromagnetic coherent modes with frequencies f ～ 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 ～ 20–50 kHz and the other one is in the high-frequency range of f ～ 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 Alfvén 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 Alfvén eigenmode located in the edge, and the high-frequency coherent mode is radially global, which is characterized by a toroidal Alfvén eigenmode (TAE) in the core and also has the components of a kinetic TAE and ellipticity-induced Alfvén eigenmode in the outer region due to the large downshift of the Alfvén continuum gap from the core to the edge in H-mode discharges.
关键词	Alfvén eigenmodes nonlinear mode coupling energetic electrons
DOI	10.1088/1741-4326/abd7b9
语种	英语
WOS记录号	IOP:0029-5515-61-4-abd7b9
出版者	IOP Publishing
引用统计
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/120700
专题	中国科学院合肥物质科学研究院
作者单位	1.Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, China 2.Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China 3.Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 4.Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China 5.Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China 6.Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, China
推荐引用方式 GB/T 7714	Zhao,N.,Bao,J.,Chen,W.,et al. Multiple Alfvén 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..,...&the EAST Team,.(2021).Multiple Alfvén 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 Alfvén eigenmodes induced by energetic electrons and nonlinear mode couplings in EAST radio-frequency heated H-mode plasmas".Nuclear Fusion 61(2021).