Investigation of annular/central collapse events triggered by the double tearing modes in EAST

doi:10.1088/1741-4326/ac1dc4

	Investigation of annular/central collapse events triggered by the double tearing modes in EAST
	Xu, Ming; Hu, Liqun; Zhou, Tianfu; Zhang, Ling; Xu, Liqing; Duan, Yanmin; Zang, Qing; Liu, Haiqing; Gong, Xianzu; Xu, Guosheng
刊名	NUCLEAR FUSION
	2021-10-01
卷号	61
关键词	reversed magnetic shear double tearing modes high-Z impurity
ISSN号	0029-5515
DOI	10.1088/1741-4326/ac1dc4
通讯作者	Hu, Liqun(lqhu@ipp.ac.cn) ; Zhang, Ling(zhangling@ipp.ac.cn)
英文摘要	Annular/central collapses of electron temperature have been investigated in the EAST tokamak. The precursor modes are excited before the annular/central collapse events, and the coexistence of multi magnetic island chains can be observed synchronously for the core concentration of high-Z impurities. The primary magnetic islands for the two cases are located in the same region of 0.25 <= rho(r/a) <= 0.35, while the secondary magnetic islands for central and annular cases are located inside (rho approximate to 0.1) and outside (rho approximate to 0.4) respectively. The similar simulation has been performed by the toroidal resistive MHD code CLT (Zhang et al 2020 Phys. Plasmas 27 122509), and the annular/central collapse events can be reproduced by the magnetic reconnection of m/n = 2/1 double tearing modes, m and n are the poloidal and toroidal mode numbers respectively. The combination of lower hybrid current driven and off-axis electron cyclotron resonance heating is an essential condition for the establishment of reversed magnetic shear. The different penetration depth of high-Z impurity density plays an important role for excitation of the annular/central collapse events, e.g. the steeper gradient of T (e)-profile can be formed accordingly in the annular region of 0.1 <= rho <= 0.4, together with excitation of the precursor modes.
资助项目	National MCF Energy RD Program[2019YFE03020000] ; National MCF Energy RD Program[2018YFE0304100] ; National Key Research and Development Program of China[2017YFE0301300] ; National Nature Science Foundation of China[11975267] ; National Nature Science Foundation of China[11975273]
WOS关键词	CONFINEMENT
WOS研究方向	Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000692590300001
资助机构	National MCF Energy RD Program ; National Key Research and Development Program of China ; National Nature Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/125265]
专题	中国科学院合肥物质科学研究院
通讯作者	Hu, Liqun; Zhang, Ling
作者单位	Chinese Acad Sci ASIPP, Inst Plasma Phys, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Xu, Ming,Hu, Liqun,Zhou, Tianfu,et al. Investigation of annular/central collapse events triggered by the double tearing modes in EAST[J]. NUCLEAR FUSION,2021,61.
APA	Xu, Ming.,Hu, Liqun.,Zhou, Tianfu.,Zhang, Ling.,Xu, Liqing.,...&Xu, Guosheng.(2021).Investigation of annular/central collapse events triggered by the double tearing modes in EAST.NUCLEAR FUSION,61.
MLA	Xu, Ming,et al."Investigation of annular/central collapse events triggered by the double tearing modes in EAST".NUCLEAR FUSION 61(2021).