Parametric decay instabilities of lower hybrid waves on CFETR

doi:10.1088/1674-1056/ac67c2

	Parametric decay instabilities of lower hybrid waves on CFETR
	Zhou, Taotao 1,2; Xiang, Nong 1,3; Gan, Chunyun 1,3; Jia, Guozhang 1,3; Chen, Jiale 1,3
刊名	CHINESE PHYSICS B
	2022-08-01
卷号	31
关键词	lower hybrid parametric instability CFETR
ISSN号	1674-1056
DOI	10.1088/1674-1056/ac67c2
通讯作者	Xiang, Nong(xiangn@ipp.ac.cn) ; Gan, Chunyun(cygan@ipp.ac.cn)
英文摘要	The lower hybrid current drive is a potential candidate for sustaining plasma current in tokamak steady-state operations, which could be used in China Fusion Engineering Test Reactor (CFETR) with input power up to a few tens of megawatts. Such high input power could trigger the well-known parametric instabilities (PIs) at the plasma edge affecting the propagation and absorption of the lower hybrid pump waves. By analytically solving the nonlinear dispersion relation describing PIs, an explicit expression of the PI growth rate is obtained and analyzed in detail. It is found that pressure is the key parameter determining the PI characteristics. Ion sound quasi-mode is the dominant decay channel in the low-pressure regime, while the ion cyclotron quasi-mode (ICQM), as well as its harmonics, becomes dominant in the intermediate regime. In the high-pressure regime, only one mixed channel is found, which is related to Landau damping by free-streaming ions. Analytical expressions of growth rates of these decay channels are also obtained to show the parameter dependence at different pressure limits. The above analytical results are used to estimate the PIs on a typical profile of CFETR, and verified by corresponding numerical calculations. ICQM is found to be the strongest decay channel with a considerable growth rate for CFETR.
资助项目	National Key Research and Development Program of China[2017YFE0300406] ; National Key Research and Development Program of China[2019YFE00308050] ; National Natural Science Foundation of China[11975272] ; National Natural Science Foundation of China[12175274] ; National Natural Science Foundation of China[12005258] ; National Natural Science Foundation of China[11705236]
WOS关键词	CURRENT DRIVE ; ION-SOUND ; PLASMA ; PROPAGATION ; ABSORPTION
WOS研究方向	Physics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000847573800001
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/131868]
专题	中国科学院合肥物质科学研究院
通讯作者	Xiang, Nong; Gan, Chunyun
作者单位	1.Chinese Acad Sci, Inst Plasma Phys, Hefei Inst Phys Sci, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, Peoples R China 3.Chinese Acad Sci, Ctr Magnet Fus Theory, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Taotao,Xiang, Nong,Gan, Chunyun,et al. Parametric decay instabilities of lower hybrid waves on CFETR[J]. CHINESE PHYSICS B,2022,31.
APA	Zhou, Taotao,Xiang, Nong,Gan, Chunyun,Jia, Guozhang,&Chen, Jiale.(2022).Parametric decay instabilities of lower hybrid waves on CFETR.CHINESE PHYSICS B,31.
MLA	Zhou, Taotao,et al."Parametric decay instabilities of lower hybrid waves on CFETR".CHINESE PHYSICS B 31(2022).