Analytical study on magnetic component of geodesic acoustic mode

doi:10.1088/1402-4896/ac698d

	Analytical study on magnetic component of geodesic acoustic mode
	Xie,Baoyi 1,3; Ye,Lei 4; Chen,Yang 2; Zhao,Pengfei 4; Guo,Wenfeng 4; Xiang,Nong 4
刊名	Physica Scripta
	2022-05-03
卷号	97
关键词	geodesic acoustic mode magnetic components gyrokinetic equation coupling of magnetic drift frequency
ISSN号	0031-8949
DOI	10.1088/1402-4896/ac698d
通讯作者	Xie,Baoyi()
英文摘要	Abstract To understand the role of geodesic acoustic modes (GAMs) in regulating the transport by interacting with background electromagnetic turbulence, a thorough theoretical understanding of the magnetic components of the mode is required. In this study, the magnetic components of GAM are analytically investigated under the gyrokinetic framework with both the m = 1 and m = 2 harmonics are considered, where m is the poloidal mode number. With the quasi-neutrality condition and Ampère’s law, the amplitudes of various poloidal magnetic components are derived. It is shown that both m = 1 and m = 2 magnetic components exist and are dominated by the cosine and sine components, respectively. In addition, it is found that the amplitudes of all magnetic components increase with respect to the ratio of plasma pressure to magnetic pressure β and safety factor q . Most importantly, the amplitude of m = 1 magnetic component is significantly enhanced due to the coupling of magnetic drift frequency with the first and second harmonics of the distribution functions, thus it can be comparable to that of m = 2 magnetic component under certain conditions. The various magnetic components derived in this study may provide some guidance for experimental measurements.
语种	英语
出版者	IOP Publishing
WOS记录号	IOP:PS_97_6_065601
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/129637]
专题	中国科学院合肥物质科学研究院
通讯作者	Xie,Baoyi
作者单位	1.Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, People’s Republic of China 2.Department of Physics, University of Colorado at Boulder, Boulder 80309, United States of America 3.Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, People’s Republic of China 4.Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
推荐引用方式 GB/T 7714	Xie,Baoyi,Ye,Lei,Chen,Yang,et al. Analytical study on magnetic component of geodesic acoustic mode[J]. Physica Scripta,2022,97.
APA	Xie,Baoyi,Ye,Lei,Chen,Yang,Zhao,Pengfei,Guo,Wenfeng,&Xiang,Nong.(2022).Analytical study on magnetic component of geodesic acoustic mode.Physica Scripta,97.
MLA	Xie,Baoyi,et al."Analytical study on magnetic component of geodesic acoustic mode".Physica Scripta 97(2022).