Investigation of the double peak in the visible-light range of radiative divertor emission profiles on the EAST tokamak

doi:10.1088/1361-6587/ac2afa

	Investigation of the double peak in the visible-light range of radiative divertor emission profiles on the EAST tokamak
	Guo, Jin 1; Lu, Zhiyuan 1,2; Jia, Guozhang 2; Ruan, Xinglei 1; Xu, Yuchen 1; Mao, Shifeng 1; Yang, Jianhua 2; Wang, Yumin 2; Meng, Lingyi 2; Yang, Qingquan 2
刊名	PLASMA PHYSICS AND CONTROLLED FUSION
	2021-12-01
卷号	63
关键词	impurity radiation visible-light imaging tungsten divertor carbon migration SOLPS-ITER DIVIMP EAST
ISSN号	0741-3335
DOI	10.1088/1361-6587/ac2afa
通讯作者	Mao, Shifeng(sfmao@ustc.edu.cn) ; Ye, Minyou(yemy@ustc.edu.cn)
英文摘要	The double-peaked emission profile has been identified by tomographic reconstruction from the signals of the tangentially viewing visible-light imaging system on EAST. In the upper-single-null discharge with neon seeding, two light emission peaks are located near the X-point and in the high-field-side (HFS) scrape-off layer (SOL) on the poloidal cross-section while the outer divertor target is still attached. The double-peaked emission phenomenon has not been reported for other tokamaks. In particular, the existence of the emission peak near the X-point under the attached condition is unexpected because it is usually an indication of X-point multifaceted asymmetric radiation from the edge under the detached condition. Therefore, it is of fundamental importance for the divertor physics to make clear the mechanism of the double-peaked emission phenomenon. The computational simulations with SOLPS-ITER and DIVIMP are performed in this work. The simulated results show the contribution of W impurity to the double-peaked emission profile is negligible with the upper tungsten divertor. Considering the existence of a lower carbon divertor in EAST, the influence of the possible deposition of the carbon on the upper divertor is further investigated. The simulating CIII (465 nm) and CII (514 nm) emissions, which make a significant contribution to the visible-light emission in channel B (blue) and G (green), respectively, are found to be similar tothe experimental results. The emission peak near the X-point is related to the carbon deposited on the dome, while that in the HFS SOL is contributed by the carbon on the inner baffle. The ionization source of the carbon impurity and the net force pointing to the X-point are analyzed to understand the concentration of the carbon impurity near the X-point, which in turn causes the emission peak.
资助项目	National Key Research and Development Program of China[2018YFE0302101] ; National Natural Science Foundation of China[11975232] ; Collaborative Innovation Program of Hefei Science Center, CAS[2020HSC-CIP015] ; Supercomputing Center of the University of Science and Technology of China
WOS关键词	ASDEX-UPGRADE ; TRANSPORT ; TUNGSTEN ; POWER ; IMPURITIES ; FORMULAS ; PLASMAS ; EROSION
WOS研究方向	Physics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000739529400001
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China ; Collaborative Innovation Program of Hefei Science Center, CAS ; Supercomputing Center of the University of Science and Technology of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/127245]
专题	中国科学院合肥物质科学研究院
通讯作者	Mao, Shifeng; Ye, Minyou
作者单位	1.Univ Sci & Technol China, Sch Nucl Sci & Technol, 96 Jinzhai Rd, Hefei 230026, Anhui, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Guo, Jin,Lu, Zhiyuan,Jia, Guozhang,et al. Investigation of the double peak in the visible-light range of radiative divertor emission profiles on the EAST tokamak[J]. PLASMA PHYSICS AND CONTROLLED FUSION,2021,63.
APA	Guo, Jin.,Lu, Zhiyuan.,Jia, Guozhang.,Ruan, Xinglei.,Xu, Yuchen.,...&Ye, Minyou.(2021).Investigation of the double peak in the visible-light range of radiative divertor emission profiles on the EAST tokamak.PLASMA PHYSICS AND CONTROLLED FUSION,63.
MLA	Guo, Jin,et al."Investigation of the double peak in the visible-light range of radiative divertor emission profiles on the EAST tokamak".PLASMA PHYSICS AND CONTROLLED FUSION 63(2021).