Characteristics of double-peaked particle deposition at divertor target plates in the EAST tokamak

doi:10.1088/1741-4326/ac077e

	Characteristics of double-peaked particle deposition at divertor target plates in the EAST tokamak
	Xu, J. C.1; Wang, L.4; Wang, H. Q.3; Xu, G. S.4; Liu, J. B.4; Li, A.4; Meng, L. Y.4; Wu, X. Q.4; Yu, L.4; Ding, F.4
刊名	NUCLEAR FUSION
	2021-09-01
卷号	61
关键词	double-peaked distribution particle deposition divertor EAST tokamak
ISSN号	0029-5515
DOI	10.1088/1741-4326/ac077e
通讯作者	Wang, L.(lwang@ipp.ac.cn) ; Wang, H. Q.(wanghuiqian@fusion.gat.com)
英文摘要	Increasing the heat and particle deposition on the divertor target plates is an effective approach for reducing the extremely high heat load. Future tokamak fusion devices are expected to have a deposition width on the order of a millimeter. Recently, a double-peaked distribution (DPD) pattern of particle deposition at the divertor target plates has been observed in both deuterium and helium plasma discharges in the Experimental Advanced Superconducting Tokamak, which can significantly spread the deposition width of heat and particle fluxes, and clearly shows a toroidal symmetric distribution. It has been found that the DPD behavior occurs not only in plasma discharges with lower hybrid wave (LHW) heating, but also with electron cyclotron resonance heating or neutral beam injection (NBI) heating alone. In addition, the DPD shows an obvious in-out asymmetry between the divertor target plates, which strongly depends on the toroidal field direction, i.e. it distinctly appears on the outer divertor plate in unfavorable B-t conditions, while shifting to the inner divertor plate under favorable B-t conditions. Meanwhile, the transition between the single-peaked distribution and the DPD is normally correlated with the line-averaged plasma density (n) over bar (e) and the auxiliary heating power. The statistical results for the pure LHW heating discharge scheme show that the DPD behavior is significantly affected by both the plasma density and the heating power, i.e. the lower the ratio of the plasma density to the heating power, the more likely it is that DPD behavior will occur. The critical boundary lines between the DPD and non-DPD patterns are obtained with the line expressions (n) over bar (e) similar to 2P(LHW,abs) + 1.4 and (n) over bar (e) similar to 3.33P(LHW,abs) + 1 for the unfavorable and favorable B-1 cases, respectively. Finally, the underlying physics is also discussed, suggesting that the electric field drifts and the local sheath boundary condition may exert a strong influence on the DPD.
资助项目	National Natural Science Foundation of China[U19A20113] ; National Natural Science Foundation of China[120005004] ; National Natural Science Foundation of China[11922513] ; National Natural Science Foundation of China[11905255] ; National Natural Science Foundation of China[11805238] ; National Magnetic Confinement Fusion Energy R&D Program of China[2017YFE0301300] ; National Magnetic Confinement Fusion Energy R&D Program of China[2019YFE03030000] ; AHNSF[2008085QA38] ; AHNSF[1808085J07] ; Institute of Energy, Hefei Comprehensive National Science Center[GXXT-2020-004]
WOS关键词	DRIFTS ; DETACHMENT ; POWER
WOS研究方向	Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000676027700001
资助机构	National Natural Science Foundation of China ; National Magnetic Confinement Fusion Energy R&D Program of China ; AHNSF ; Institute of Energy, Hefei Comprehensive National Science Center
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/123317]
专题	中国科学院合肥物质科学研究院
通讯作者	Wang, L.; Wang, H. Q.
作者单位	1.Anhui Univ Sci & Technol, Sch Mech Engn, Huainan 232001, Peoples R China 2.Dalian Univ Technol, Sch Phys, Minist Educ, Key Lab Mat Modificat Laser Ion & Electron Beams, Dalian 116024, Peoples R China 3.Gen Atom, POB 85608, San Diego, CA 92186 USA 4.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Xu, J. C.,Wang, L.,Wang, H. Q.,et al. Characteristics of double-peaked particle deposition at divertor target plates in the EAST tokamak[J]. NUCLEAR FUSION,2021,61.
APA	Xu, J. C..,Wang, L..,Wang, H. Q..,Xu, G. S..,Liu, J. B..,...&Dai, S. Y..(2021).Characteristics of double-peaked particle deposition at divertor target plates in the EAST tokamak.NUCLEAR FUSION,61.
MLA	Xu, J. C.,et al."Characteristics of double-peaked particle deposition at divertor target plates in the EAST tokamak".NUCLEAR FUSION 61(2021).