Divertor plasma behaviors with neon seeding at different locations on EAST with ITER-like divertor

doi:10.1088/1741-4326/ac74cf

	Divertor plasma behaviors with neon seeding at different locations on EAST with ITER-like divertor
	Meng, L. Y.1,6; Wang, L.1,5; Wang, H. Q.4; Deng, G. Z.1,3; Si, H.1; Li, K. D.1; Xu, G. S.1; Yuan, Q. P.1; Guo, H. Y.4; Eldon, D.4
刊名	NUCLEAR FUSION
	2022-08-01
卷号	62
关键词	neon seeding divertor detachment seeding location EAST
ISSN号	0029-5515
DOI	10.1088/1741-4326/ac74cf
通讯作者	Wang, L.(lwang@ipp.ac.cn) ; Wang, H. Q.(wanghuiqian@fusion.gat.com)
英文摘要	For the problem of excessively high divertor heat flux, active impurity seeding is an effective method to radiate the plasma energy reaching the divertor and thus achieve the divertor detachment. Neon is a very effective radiation impurity on many current tokamaks, which is also a candidate species to be applied on ITER. In the EAST 2019 experimental campaign, a series of experiments were performed by seeding a mixture of neon and deuterium (Ne-D-2) for detachment and core-edge-divertor integration in H-mode plasmas. The divertor partial detachment with high-confinement core plasma has been achieved by using Ne-D-2 seeding in EAST with ITER-like tungsten divertor. Both the plasma stored energy and H (98,y2) > 1.1 are maintained, with the divertor electron temperature, heat flux and the surface temperature near the strike point being all significantly reduced. The differences between Ne-D-2 seeding at the scrape-off layer (SOL) upstream and downstream have been experimentally investigated in detail. It is found that impurity seeding at SOL downstream is more beneficial to reducing the divertor electron temperature and peak heat flux. By comparison with experiments using divertor D-2 fueling, it is further demonstrated that gas seeding in the SOL downstream will enrich more particles near the strike point, while the seeding in the SOL upstream will influence the entire outer target more evenly. Furthermore, in most of the experiments, gas seeding does not cause obvious toroidal asymmetry in the divertor plasma. However, when D-2 is injected in an amount similar to that used to build the plasma, it causes the particle flux near the gas-puff to increase locally, i.e., much more than that at the toroidal location far from the gas-puff location. It is a competition between particle source and transport. When the particle source is stronger, it will naturally increase the local particles. In addition, dedicated experiments with different poloidal distances between impurity seeding and strike point on the radiation ability were carried out. Both experimental results and SOLPS simulation show that the seeding close to the strike point is more conducive to neon ionization and energy radiation.
资助项目	National Key R&D Program of China[2017YFE0301300] ; National Key R&D Program of China[2018YFE0303104] ; National Key R&D Program of China[2017YFE0402500] ; National Key R&D Program of China[2019YFE03030000] ; Institute of Energy, Hefei Comprehensive National Science Center[GXXT-2020-004] ; National Natural Science Foundation of China[11922513] ; National Natural Science Foundation of China[U19A20113] ; National Natural Science Foundation of China[11905255] ; National Natural Science Foundation of China[12005004] ; National Natural Science Foundation of China[12005257] ; National Natural Science Foundation of China[U1867222] ; Anhui Provincial Natural Science Foundation[2008085QA38] ; Scientific Research Grant of Hefei Science Center of Chinese Academy of Sciences[2020HSC-CIP015] ; EAST Team
WOS关键词	ASDEX ; POWER
WOS研究方向	Physics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000813913500001
资助机构	National Key R&D Program of China ; Institute of Energy, Hefei Comprehensive National Science Center ; National Natural Science Foundation of China ; Anhui Provincial Natural Science Foundation ; Scientific Research Grant of Hefei Science Center of Chinese Academy of Sciences ; EAST Team
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/129586]
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.Chinese Acad Sci, Inst Plasma Phys, HFIPS, Hefei 230031, Peoples R China 2.Univ Sci & Technol, Sch Mech Engn Anhui, Huainan 232001, Peoples R China 3.Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China 4.Gen Atom, POB 85608, San Diego, CA 92186 USA 5.Hefei Comprehens Natl Sci Ctr, Inst Energy, Hefei 230031, Peoples R China 6.Univ Sci & Technol China, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Meng, L. Y.,Wang, L.,Wang, H. Q.,et al. Divertor plasma behaviors with neon seeding at different locations on EAST with ITER-like divertor[J]. NUCLEAR FUSION,2022,62.
APA	Meng, L. Y..,Wang, L..,Wang, H. Q..,Deng, G. Z..,Si, H..,...&Zhang, T..(2022).Divertor plasma behaviors with neon seeding at different locations on EAST with ITER-like divertor.NUCLEAR FUSION,62.
MLA	Meng, L. Y.,et al."Divertor plasma behaviors with neon seeding at different locations on EAST with ITER-like divertor".NUCLEAR FUSION 62(2022).