Investigation of Alfvén eigenmodes and energetic particle modes in EAST with neutral beam injection

doi:10.1088/1741-4326/abf2e2

	Investigation of Alfvén eigenmodes and energetic particle modes in EAST with neutral beam injection
	Xu,Liqing 1; Shen,Wei 1; Ren,Zhenzhen 2; Zhou,Tianfu 1; Wang,Yifeng 3,4; Hui,Lian 5; Zhang,Dingzong 6; Huang,Yueheng 3,4; Hu,Youjun 1; Hao,Baolong 3,4
刊名	Nuclear Fusion
	2021-05-17
卷号	61
关键词	Alfvén eigenmodes EAST frequency chirping fast ions wave-particle resonance energetic particle modes
ISSN号	0029-5515
DOI	10.1088/1741-4326/abf2e2
通讯作者	Shen,Wei() ; Hu,Liqun()
英文摘要	AbstractAlfvén eigenmodes (AEs) and energetic particle modes (EPMs) have been observed in EAST neutral beam injection plasma with the presence of heavy tungsten impurity in the core region. The AEs are identified as toroidal Alfvén eigenmodes (TAEs) with roughly constant frequency fTAE ～ 100?kHz and a special set of AEs with frequency chirping up from frequency fAE ～ 70?kHz to fAE ～ 100?kHz. The frequency of EPMs is around fEPM ～ 60?kHz, exhibiting with frequency chirping down feature. A transition from EPMs to AEs is found, and the location and mode numbers are measured by experimental diagnostics. Hybrid simulations with the global kinetic-magnetohydrodynamic code M3D-K have been carried out to investigate the observed AEs and EPMs, and linear simulations find the EPM with toroidal mode number n = 2 and poloidal mode number m = 3. Nonlinear simulations show that the EPM frequency chirps down nonlinearly, and then two modes emerge with frequencies around 72.7 kHz and 88.0 kHz: the mode with higher frequency is a TAE, and the other mode is an EPM. Afterward, the TAE disappears quickly with the frequency almost unchanged, and the EPM with lower frequency chirps down continuously. The mode frequencies and locations of the simulated EPM and TAE, as well as the chirping down feature of the EPM frequency, are consistent with the experimental measurements. The transition from EPM to TAE is found to be a self-consistent dynamic of nonlinear evolution with the expel of energetic ions due to EPM.
语种	英语
出版者	IOP Publishing
WOS记录号	IOP:0029-5515-61-7-ABF2E2
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/122523]
专题	中国科学院合肥物质科学研究院
通讯作者	Shen,Wei; Hu,Liqun
作者单位	1.Institute of Plasma Physics, Chinese Academy of Science, Hefei 230031, China 2.School of Physics and Materials Science, Anhui University, Hefei, Anhui 230039, China 3.Advanced Energy Research Center, Shenzhen University, Shenzhen, China 4.Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, China 5.University of California, Los Angeles, California, United States of America 6.College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang 421008, China
推荐引用方式 GB/T 7714	Xu,Liqing,Shen,Wei,Ren,Zhenzhen,et al. Investigation of Alfvén eigenmodes and energetic particle modes in EAST with neutral beam injection[J]. Nuclear Fusion,2021,61.
APA	Xu,Liqing.,Shen,Wei.,Ren,Zhenzhen.,Zhou,Tianfu.,Wang,Yifeng.,...&Xiang,Nong.(2021).Investigation of Alfvén eigenmodes and energetic particle modes in EAST with neutral beam injection.Nuclear Fusion,61.
MLA	Xu,Liqing,et al."Investigation of Alfvén eigenmodes and energetic particle modes in EAST with neutral beam injection".Nuclear Fusion 61(2021).