Plasma performance improvement with favourable B-t relative to unfavourable B-t in RF-heated H-mode plasmas in EAST

doi:10.1088/1741-4326/abcb27

	Plasma performance improvement with favourable B-t relative to unfavourable B-t in RF-heated H-mode plasmas in EAST
	Lin, X.2,3; Yang, Q. Q.2; Xu, G. S.2; Huang, J.2; Gong, X. Z.2; Wang, L.2; Qian, J. P.2; Zhang, B.2; Garofalo, A. M.1; Chen, R.2
刊名	NUCLEAR FUSION
	2021-02-01
卷号	61
关键词	plasma performance improvement favourable toroidal field EAST lower hybrid wave (LHW)
ISSN号	0029-5515
DOI	10.1088/1741-4326/abcb27
通讯作者	Xu, G. S.(gsxu@ipp.ac.cn) ; Huang, J.(juan.huang@ipp.ac.cn)
英文摘要	Significant improvement of plasma performance in high-confinement mode (H-mode) discharges with favourable toroidal field B-t, i.e. the ion backward difference B drift towards the primary X-point, has been widely observed in the EAST tokamak with pure radio-frequency heating in contrast to that with the unfavourable B-t. Statistical analysis indicates that plasma in the favourable B-t has higher core electron temperature, similar core ion temperature and relatively steeper pedestal density compared with that in the unfavourable B-t. The improvement in plasma performance is mainly contributed by the increase of core electron temperature in the favourable B-t. Further analysis indicates that the plasma with favourable B-t has much lower density and recycling in the scrape-off layer (SOL). Lower SOL density and recycling benefit the mitigation of parametric instability activity of lower hybrid wave (LHW), and thus facilitate the increase of core electron temperature in the favourable B-t. The performance improvement in the favourable B-t demonstrates to be more evident with high LHW power. Divertor local E-r x B drift which can increase the backflow particles from the divertor region to the upstream region could be partly responsible for the much higher SOL plasma density in unfavourable B-t. These findings could facilitate the application of LHW power on future large fusion devices, such as the China Fusion Engineering Test Reactor, to achieve high-performance steady-state operation.
资助项目	National Natural Science Foundation of China[12005257] ; National Natural Science Foundation of China[11675220] ; National Natural Science Foundation of China[11705237] ; National Natural Science Foundation of China[11975276] ; National Natural Science Foundation of China[11922513] ; National Natural Science Foundation of China[11905143] ; K.C. Wong Education Foundation ; Key Research Program of Frontier Sciences, CAS[QYZDB-SSWSLH001] ; CASHIPS Director's Fund[YZJJ2020QN13] ; Anhui Provincial Natural Science Foundation[2008085J04] ; Special Research Assistant Funding of CAS ; China Postdoctoral Science Foundation[2020M671913]
WOS关键词	DENSITY PROFILE ; EDGE PLASMA ; CONFINEMENT ; TRANSPORT ; REFLECTOMETRY ; INSTABILITY ; TURBULENCE ; SYSTEM ; SHEAR
WOS研究方向	Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000607475100001
资助机构	National Natural Science Foundation of China ; K.C. Wong Education Foundation ; Key Research Program of Frontier Sciences, CAS ; CASHIPS Director's Fund ; Anhui Provincial Natural Science Foundation ; Special Research Assistant Funding of CAS ; China Postdoctoral Science Foundation
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/120083]
专题	中国科学院合肥物质科学研究院
通讯作者	Xu, G. S.; Huang, J.
作者单位	1.Gen Atom, San Diego, CA 92186 USA 2.Chinese Acad Sci, Inst Plasma Phys, HFIPS, Hefei 230031, Peoples R China 3.Univ Sci & Technol China, Hefei 230026, Peoples R China 4.Shenzhen Univ, Shenzhen 518060, Peoples R China
推荐引用方式 GB/T 7714	Lin, X.,Yang, Q. Q.,Xu, G. S.,et al. Plasma performance improvement with favourable B-t relative to unfavourable B-t in RF-heated H-mode plasmas in EAST[J]. NUCLEAR FUSION,2021,61.
APA	Lin, X..,Yang, Q. Q..,Xu, G. S..,Huang, J..,Gong, X. Z..,...&Duan, Y. M..(2021).Plasma performance improvement with favourable B-t relative to unfavourable B-t in RF-heated H-mode plasmas in EAST.NUCLEAR FUSION,61.
MLA	Lin, X.,et al."Plasma performance improvement with favourable B-t relative to unfavourable B-t in RF-heated H-mode plasmas in EAST".NUCLEAR FUSION 61(2021).