Simulation study of the influence of upstream density and power in the scrape-off layer on the double-peaked density profile at the divertor target

doi:10.1088/1741-4326/ac9320

	Simulation study of the influence of upstream density and power in the scrape-off layer on the double-peaked density profile at the divertor target
	Guo, Jin 1; Mao, Shifeng 1; Jia, Guozhang 3; Meng, Lingyi 3; Li, Ang 3; Xu, Jichan 2; Xu, Guosheng 3; Ye, Minyou 1
刊名	NUCLEAR FUSION
	2022-12-01
卷号	62
关键词	edge plasma transport double peak profile drift SOLPS-ITER EAST
ISSN号	0029-5515
DOI	10.1088/1741-4326/ac9320
通讯作者	Mao, Shifeng(sfmao@ustc.edu.cn) ; Ye, Minyou(yemy@ustc.edu.cn)
英文摘要	The double-peaked distribution of particle deposition at divertor targets has been observed in various tokamaks, and is considered a potential approach for mitigating divertor particles and heat load in future fusion reactors. Recently, the systematical analysis of the double-peaked distribution behavior during EAST experiments shows that the appearance of the double-peaked profile is related to the line-average density and heating power. In order to understand general trends and related mechanisms, the influences of the upstream density (n(e,sep)) and power in the scrape-off layer (P-SOL) on the double-peaked density profile are investigated by SOILS-ITER simulations with full drifts and currents. It is found that the ne peak near the strike point is mainly contributed by the strong ionization source close to the target, and the n(e) peak in the far-SOL region is caused by the synergetic effects of poloidal and radial E x B drifts along the SOL. The double-peaked distribution is affected by the P-SOL, and impurity seeding by increasing or decreasing the whole profile of the electron temperature at the target (T-et). When the peak value of T-et (T-et,T-peak) is fixed, the density peak in the far-SOL is increased for higher n(e,sep) by reducing the T-et in the far-SOL region on the lower-field side under unfavorable B-T and by the upstream-extended ionization source due to the geometry effect on the high-field side under favorable B-T. Statistical analysis of the simulated results shows that the scaling expression of the peak ratio is similar to T(et,peak)(-(1.4 similar to 2.1))n(e,sep)(1.6 similar to 1.8). In addition to the upper boundary found in the analysis of EAST experiments, a lower boundary of the region where the double-peaked feature appears on the P-SOL-n(e,sep) plane is identified by simulations and preliminarily confirmed according to the measurements in several EAST discharges.
资助项目	National Key R & D Program of China[2019YFE03030004] ; National Natural Science Foundation of China[11975232] ; National Natural Science Foundation of China[U19A20113]
WOS关键词	ELECTRIC-FIELDS ; FLUX
WOS研究方向	Physics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000875385000001
资助机构	National Key R & D 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/334002/129839]
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, Anhui, Peoples R China 2.Anhui Univ Sci & Technol, Sch Mech Engn, Huainan 232001, Peoples R China 3.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Guo, Jin,Mao, Shifeng,Jia, Guozhang,et al. Simulation study of the influence of upstream density and power in the scrape-off layer on the double-peaked density profile at the divertor target[J]. NUCLEAR FUSION,2022,62.
APA	Guo, Jin.,Mao, Shifeng.,Jia, Guozhang.,Meng, Lingyi.,Li, Ang.,...&Ye, Minyou.(2022).Simulation study of the influence of upstream density and power in the scrape-off layer on the double-peaked density profile at the divertor target.NUCLEAR FUSION,62.
MLA	Guo, Jin,et al."Simulation study of the influence of upstream density and power in the scrape-off layer on the double-peaked density profile at the divertor target".NUCLEAR FUSION 62(2022).