Impact of divertor closure on edge plasma behavior in EAST H-mode plasmas

doi:10.1088/1361-6587/abf447

HFCAS OpenIR

	Impact of divertor closure on edge plasma behavior in EAST H-mode plasmas
	Tao, Y. Q.1,2; Xu, G. S.1 ; Yang, Q. Q.1 ; Yan, N.1 ; Jia, G. Z.1; Meng, L. Y.1,2; Liu, S. C.1; Chen, L.1 ; Yu, Y. W.1; Gao, W.1 ; Wang, Y. M.1; Wang, L.1 ; Zang, Q.1 ; Gao, S. L.1,2
	2021-06-01
发表期刊	PLASMA PHYSICS AND CONTROLLED FUSION
ISSN	0741-3335
通讯作者	Xu, G. S.(gsxu@ipp.ac.cn) ; Yang, Q. Q.(yangqq@ipp.ac.cn)
摘要	A series of H-mode discharges have been conducted in the EAST tokamak to study the effect of divertor closure on divertor neutral distribution and edge plasmas by scanning the location of the outer strike point. When the outer strike point moves close to the corner within similar to 4.5 cm, the gauge in upper sub-divertor shows that the neutral pressure increases, and the reciprocating probe at outer mid-plane indicates that electron temperature decreases and electron density increases in the scrape-off layer (SOL). In the meantime, the tungsten impurity concentration and radiation power in the main plasma decrease remarkably, while the main plasma density and stored energy increase slightly. SOLPS-ITER simulation without particle drifts is performed to better understand the impact of divertor closure. The simulation clearly demonstrates that a more closed divertor produces more neutrals around the corner with the increase of electron density and the decrease of electron temperature in the SOL, consistent with experimental results. Furthermore, more neutrals escape the divertor region and penetrate into the pedestal region, which induces more pedestal fuelling, increasing pedestal electron density. EAST will upgrade the lower divertor with a more closed geometry. These results provide important guidance for the upcoming upgrade.
关键词	divertor closure strike point neutrals EAST SOLPS-ITER
DOI	10.1088/1361-6587/abf447
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2017YFE0301300] ; National Natural Science Foundation of China[12005257] ; National Natural Science Foundation of China[11905143] ; National Natural Science Foundation of China[11922513] ; CASHIPS Director's Fund[BJPY2019A01] ; CASHIPS Director's Fund[YZJJ2020QN13] ; Special Research Assistant Funding of CAS ; China Postdoctoral Science Foundation[2020M671913]
项目资助者	National Key Research and Development Program of China ; National Natural Science Foundation of China ; CASHIPS Director's Fund ; Special Research Assistant Funding of CAS ; China Postdoctoral Science Foundation
WOS研究方向	Physics
WOS类目	Physics, Fluids & Plasmas
WOS记录号	WOS:000642194000001
出版者	IOP PUBLISHING LTD
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/121760
专题	中国科学院合肥物质科学研究院
通讯作者	Xu, G. S.; Yang, Q. Q.
作者单位	1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, Peoples R China
第一作者单位	中科院等离子体物理研究所
通讯作者单位	中科院等离子体物理研究所
推荐引用方式 GB/T 7714	Tao, Y. Q.,Xu, G. S.,Yang, Q. Q.,et al. Impact of divertor closure on edge plasma behavior in EAST H-mode plasmas[J]. PLASMA PHYSICS AND CONTROLLED FUSION,2021,63.
APA	Tao, Y. Q..,Xu, G. S..,Yang, Q. Q..,Yan, N..,Jia, G. Z..,...&Gao, S. L..(2021).Impact of divertor closure on edge plasma behavior in EAST H-mode plasmas.PLASMA PHYSICS AND CONTROLLED FUSION,63.
MLA	Tao, Y. Q.,et al."Impact of divertor closure on edge plasma behavior in EAST H-mode plasmas".PLASMA PHYSICS AND CONTROLLED FUSION 63(2021).