Metallic impurity content behavior during ICRH-heated L-mode discharges in EAST

doi:10.1088/1741-4326/abae82

	Metallic impurity content behavior during ICRH-heated L-mode discharges in EAST
	Urbanczyk, G.2,3,4; Zhang, X. J.3; Zhang, L.3; Colas, L.4; Dumont, R.4; Tierens, W.5; Lerche, E.6; Van Eester, D.6; Heuraux, S.1; Yang, X. D.3
刊名	NUCLEAR FUSION
	2020-12-01
卷号	60
关键词	ICRH RF sheath near field far field impurity tungsten heat loads
ISSN号	0029-5515
DOI	10.1088/1741-4326/abae82
通讯作者	Urbanczyk, G.(taiyang.lin@ipp.ac.cn) ; Zhang, L.(zhangling@ipp.ac.cn)
英文摘要	This study uses the diversity of materials at known locations in the experimental advanced superconducting tokamak to extract, local information on which plasma-surface interaction processes are dominant during ion cyclotron resonance heating (ICRH) (near vs far field effects). Metallic impurity content is indicated by the intensity of impurity line emissions observed with a fast-time-response extreme ultraviolet spectrometer, normalized to line-averaged plasma density, i.e.I-imp/n(e). Parametric dependencies are explored over scans of ICRH and LH (lower hybrid) power and for different toroidal phasings between straps, strap power balance, and magnetic configurations. This diversity of behavior is interpreted as the signature of different physical processes. Before 2017, as only the upper divertor region contained tungsten (W), the W content in the core used to increase a lot when moving from lower to upper single null configurations, and was correlated with the total injected power rather than the ICRH power. Molybdenum, covering the part of the inner wall facing one ion cyclotron range of frequencies (ICRF) antenna appear sensitive to this antenna power and phasing benchmarked by modeling suggesting a probable interaction due to residual ICRF waves crossing the plasma. Materials close and magnetically-connected to an active antenna show better correlation with ICRF antenna electrical tuning than those which are far away, or not connected. This is particularly the case with W since 2018, because the limiter tiles of the LH launchers were changed from graphite to tungsten. In these latter conditions, it is shown that W sources at the mid-plane (equatorial plane) contribute to a significant fraction of the core contamination by tungsten (25% in ohmic regime, and more during ICRH).
资助项目	National key research and development program[2016YFA0400600] ; National key research and development program[2016YFA0400601] ; National key research and development program[2018YFE0311100] ; National Natural Science Foundation of China[11675213] ; National Natural Science Foundation of China[11975265] ; National Natural Science Foundation of China[11775269] ; Euratom research and training program[633053]
WOS关键词	PLASMA WALL ; TORE-SUPRA ; JET ; ANTENNA
WOS研究方向	Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000575507500001
资助机构	National key research and development program ; National Natural Science Foundation of China ; Euratom research and training program
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/104389]
专题	中国科学院合肥物质科学研究院
通讯作者	Urbanczyk, G.; Zhang, L.
作者单位	1.Univ Lorraine, UMR 7198, CNRS, Inst Jean Lamour, F-54506 Vandoeuvre Les Nancy, France 2.Shenzhen Univ, Coll Phys & Optoelect Engn, Key Lab Optoelect Devices & Syst, Shenzhen 518060, Peoples R China 3.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 4.CEA, IRFM, F-13108 St Paul Les Durance, France 5.Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany 6.Associat EURATOM Belgian State, Trilateral Euregio Cluster, Lab Phys Plasmas, 30 Ave Renaissance, B-1000 Brussels, Belgium
推荐引用方式 GB/T 7714	Urbanczyk, G.,Zhang, X. J.,Zhang, L.,et al. Metallic impurity content behavior during ICRH-heated L-mode discharges in EAST[J]. NUCLEAR FUSION,2020,60.
APA	Urbanczyk, G..,Zhang, X. J..,Zhang, L..,Colas, L..,Dumont, R..,...&Wang, K..(2020).Metallic impurity content behavior during ICRH-heated L-mode discharges in EAST.NUCLEAR FUSION,60.
MLA	Urbanczyk, G.,et al."Metallic impurity content behavior during ICRH-heated L-mode discharges in EAST".NUCLEAR FUSION 60(2020).