Group velocity in spatiotemporal representation of collisionless trapped electron mode in tokamak

doi:10.7498/aps.70.20202003

	Group velocity in spatiotemporal representation of collisionless trapped electron mode in tokamak
	Liu Zhao-Yang 3; Zhang Yang-Zhong 1; Xie Tao 2; Liu A-Di 3; Zhou Chu 3
刊名	ACTA PHYSICA SINICA
	2021-06-05
卷号	70
关键词	tokamak trapped electron mode group velocity zonal flow
ISSN号	1000-3290
DOI	10.7498/aps.70.20202003
通讯作者	Liu Zhao-Yang(lzy0928@mail.ustc.edu.cn)
英文摘要	The multiple scale derivative expansion method is used to manipulate the electron drift kinetic equation, following the theoretical framework of drift wave-zonal flow system developed by Zhang et al. [Zhang Y Z, Liu Z Y, Mahajan S M, Xie T, Liu J 2017 Phys. Plasmas 24 122304]. At the zeroth order it is the linear eigenmode equation describing the trapped electron mode on a mirco-scale. At the first order it is the envelop equation for trapped electron mode modulated by the zonal flow on a meso-scale. The eigenmode equation has been solved by Xie et al. [Xie T, Zhang Y Z, Mahajan S M, Wu F, He Hongda, Liu Z Y 2019 Phys. Plasmas 26 022503] to obtain the eigenvalue and two-dimensional mode structure of trapped electron mode. These are essential components in calculating group velocities contained in the envelop equation. The radial group velocity arises from the geodesic curvature of magnetic field in tokamak. The poloidal group velocity stems from the normal curvature and diamagnetic drift velocity, which yields the mapping between the poloidal angle and time. Since the radial group velocity is also a function of poloidal angle, it is mapped to a periodic function of time with a period of milliseconds. The numerical results indicate the rapid zero-crossing, which is significant in the drift wave - zonal flow system and provides a sound foundation for studying zonal flow driven by trapped electron mode.
资助项目	National Natural Science Foundation of China[U1967206] ; National Natural Science Foundation of China[11975231] ; National Natural Science Foundation of China[11805203] ; National Natural Science Foundation of China[11775222] ; National MCF Energy R&D Program, China[2018YFE0311200] ; National MCF Energy R&D Program, China[2017YFE0301204] ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences[QYZDB-SSW-SYS004]
WOS关键词	INSTABILITY ; PLASMAS
WOS研究方向	Physics
语种	英语
出版者	CHINESE PHYSICAL SOC
WOS记录号	WOS:000659877700020
资助机构	National Natural Science Foundation of China ; National MCF Energy R&D Program, China ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/123442]
专题	中国科学院合肥物质科学研究院
通讯作者	Liu Zhao-Yang
作者单位	1.Chinese Acad Sci, Ctr Magnet Fus Theory, Hefei 230031, Peoples R China 2.Sichuan Univ Sci & Engn, Zigong 643000, Peoples R China 3.Univ Sci & Technol China, Sch Nucl Sci & Technol, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Liu Zhao-Yang,Zhang Yang-Zhong,Xie Tao,et al. Group velocity in spatiotemporal representation of collisionless trapped electron mode in tokamak[J]. ACTA PHYSICA SINICA,2021,70.
APA	Liu Zhao-Yang,Zhang Yang-Zhong,Xie Tao,Liu A-Di,&Zhou Chu.(2021).Group velocity in spatiotemporal representation of collisionless trapped electron mode in tokamak.ACTA PHYSICA SINICA,70.
MLA	Liu Zhao-Yang,et al."Group velocity in spatiotemporal representation of collisionless trapped electron mode in tokamak".ACTA PHYSICA SINICA 70(2021).