Comparison of divertor behavior and plasma confinement between argon and neon seeding in EAST

doi:10.1088/1741-4326/abf418

	Comparison of divertor behavior and plasma confinement between argon and neon seeding in EAST
	Li,Kedong 1,2; Yang,Zhongshi 1; Wang,Huiqian 3; Xu,Guosheng 1; Yuan,Qiping 1; Guo,Houyang 3; Eldon,David 3; Hyatt,Alan 3; Humphreys,David 3; Chen,Meiwen 1,2
刊名	Nuclear Fusion
	2021-04-29
卷号	61
关键词	radiative divertor experiments Ar or Ne seeding detachmente
ISSN号	0029-5515
DOI	10.1088/1741-4326/abf418
通讯作者	Yang,Zhongshi() ; Wang,Liang()
英文摘要	AbstractThe exhaust of excessively high heat and particle fluxes on the divertor target is crucial for EAST long-pulse operation. In the recent EAST experiments, stable partial energy detachment around the upper outer strike point with H98,y2 ～ 1 was achieved with either Ne or Ar seeding from the upper outer divetor target in the upper single null configuration with ITER-like tungsten divertor. With either Ar or Ne seeding, the electron temperature around the upper outer strike point (Tet,UOSP) was maintained at around 5?eV, the peak temperature of divertor target surface around the upper outer strike point (Tdiv,UO) decreased significantly, and material sputtering was well suppressed. It was observed that there was less Ar seeding needed for partial energy detachment onset than Ne seeding, which shows that Ar is more efficient in the cooling of Tet on the upper outer divertor than Ne. However, there was no detachment on the upper inner divertor with Tet around strike point (Tet,UISP) remaining >10?eV with either Ar or Ne seeding from the upper outer divertor. Accompanied with the disappearance of double peak phenomenon of ion flux density on the upper inner divertor target (js,UI), the peak Tdiv,UI around the strike point increased to around 300 °C. Although the heat flux on the upper inner divertor target (qt,UI) is still in the acceptable level, either Ar or Ne seeding only from the upper outer divertor target is not enough to protect the upper inner divertor target from sputtering under current EAST conditions. On the other hand, Ar seeding always causes confinement degradation in the partial energy detachment state. It was observed that there is a slight confinement improvement (～10%) with Ne seeding, which may be due to density peaking, dilution effects and stabilization of the ion temperature gradient mode.
资助项目	National Key Research & Development Program of China[2018YFE0303103] ; National Key Research & Development Program of China[2017YFE0301300] ; National Key Research & Development Program of China[2019YFE03030000] ; National Natural Science Foundation of China[11875287] ; National Natural Science Foundation of China[11922513] ; National Natural Science Foundation of China[U19A20113] ; National Natural Science Foundation of China[12005257] ; National Natural Science Foundation of China[11705233] ; Institute of Energy, Hefei Comprehensive National Science Center[GXXT-2020-004] ; Chinese Scholarship Council[201706340013] ; Key Research Program of Frontier Sciences, CAS[QYZDB-SSW-SLH001] ; AHNSF[1808085J07] ; CAS
WOS关键词	DETACHMENT
WOS研究方向	Physics
语种	英语
出版者	IOP Publishing
WOS记录号	IOP:0029-5515-61-6-ABF418
资助机构	National Key Research & Development Program of China ; National Natural Science Foundation of China ; Institute of Energy, Hefei Comprehensive National Science Center ; Chinese Scholarship Council ; Key Research Program of Frontier Sciences, CAS ; AHNSF ; CAS
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/121846]
专题	中国科学院合肥物质科学研究院
通讯作者	Yang,Zhongshi; Wang,Liang
作者单位	1.Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China 2.Science Island Branch of Graduate School, University of Science & Technology of China, Hefei 230026, China 3.General Atomics, PO Box 85608, San Diego, California 92186, United States of America 4.School of Mechanical Engineering, Anhui University of Science & Technology, Huainan 232001, China
推荐引用方式 GB/T 7714	Li,Kedong,Yang,Zhongshi,Wang,Huiqian,et al. Comparison of divertor behavior and plasma confinement between argon and neon seeding in EAST[J]. Nuclear Fusion,2021,61.
APA	Li,Kedong.,Yang,Zhongshi.,Wang,Huiqian.,Xu,Guosheng.,Yuan,Qiping.,...&Wang,Liang.(2021).Comparison of divertor behavior and plasma confinement between argon and neon seeding in EAST.Nuclear Fusion,61.
MLA	Li,Kedong,et al."Comparison of divertor behavior and plasma confinement between argon and neon seeding in EAST".Nuclear Fusion 61(2021).