The impact of ELM mitigation on tungsten source in the EAST divertor

doi:10.1088/1741-4326/abe697

HFCAS OpenIR

	The impact of ELM mitigation on tungsten source in the EAST divertor
	Chen,X.H.1,2; Ding,F.1; Wang,L.1; Sun,Y.W.1; Ding,R.1; Brezinsek,S.3; Zang,Q.1; Wang,Y.M.1; Duan,Y.M.1; Zhang,L.1; Hu,Z.H.1; Zhang,Q.1; Ye,D.W.1,2; Luo,Y.1,2; Meng,L.Y.1; Liu,J.B.1; Yang,Z.S.1,2; Xu,G.S.1; Liang,Y.F.1,3; Luo,G.-N.1,2; Ding,H.B.4; Hu,J.S.1
	2021-03-22
发表期刊	Nuclear Fusion
ISSN	0029-5515
通讯作者	Ding,F.() ; Luo,G.-N.()
摘要	AbstractDivertor tungsten (W) erosion source during edge localized mode (ELM) bursts in EAST is investigated based on optical emission spectroscopy on atomic neutral tungsten line emission at 400.9?nm. Both temporal evolution and total source strength are analyzed and compared in three different ELM mitigation schemes including natural ELMs, resonant magnetic perturbations (RMP) and 2.45?GHz lower hybrid wave (LHW). The mitigation of W source caused by single ELM impact at the divertor target is mainly attributed to the reduction of the W source production in the ELM decay phase. However, with the increase of ELM frequency, the time-averaged intra-ELM W source during an ELM cycle rises and dominates the evolution of the total W source with increasing fraction, which exhibits strong correlation with the core W level in the RMP scheme. In the natural ELM scheme, the pedestal electron temperature is found not only to control the effective W sputtering yield at target during ELMs, thus influencing the intra-ELM W source, but also to be related to the delay time between the divertor ELM WI emission and the core extreme ultraviolet bolometer (XUV) signal which can scale with the parallel ion transit time. Furthermore, the delay time is found to have more consistent dependence on the pedestal plasma collisionality. The rise time of intra-ELM WI emission increases when RMP or LHW is applied, revealing a different ELM mitigation mechanism in comparison with the natural ELM scheme. The temporal profiles of the intra-ELM WI emission in different ELM mitigation schemes are compared and the potential mechanism is discussed. Besides, the ELM mitigation effects with RMP are found to be asymmetric at the outer and inner divertor targets, which is characterized by the different variations of the intra-ELM W source strength and the rise time of WI emission with the ramp-up of RMP coil current. Divertor partial detachment is achieved simultaneously with strong ELM mitigation under a suitable RMP phase difference without additional gas puff.
关键词	tungsten ELM erosion RMP LHW EAST
DOI	10.1088/1741-4326/abe697
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2017YFE0301300] ; National Key Research and Development Program of China[2017YFA0402500] ; National Key Research and Development Program of China[2018YFE0303103] ; National Natural Science Foundation of China[11575243] ; National Natural Science Foundation of China[U19A20113] ; National Natural Science Foundation of China[11922513] ; National Natural Science Foundation of China[11625524] ; National Natural Science Foundation of China[11875287] ; National Natural Science Foundation of China[11861131010] ; Key Research Program of Frontier Sciences CAS[QYZDB-SSW-SLH001] ; K.C. Wong Education Foundation ; CASHIPS Director's Fund[BJPY2019A01] ; Users with Excellence Project of Hefei Science Center CAS[2018HSC-UE008] ; Users with Excellence Project of Hefei Science Center CAS[2018HSC-UE010] ; SINO-GERMAN project by the Deutsche Forschungsgemeinschaft ; Euratom research and training programme 2014-2018[633053] ; Euratom research and training programme 2019-2020[633053]
项目资助者	National Key Research and Development Program of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences CAS ; K.C. Wong Education Foundation ; CASHIPS Director's Fund ; Users with Excellence Project of Hefei Science Center CAS ; SINO-GERMAN project by the Deutsche Forschungsgemeinschaft ; Euratom research and training programme 2014-2018 ; Euratom research and training programme 2019-2020
WOS研究方向	Physics
WOS类目	Physics, Fluids & Plasmas
WOS记录号	IOP:0029-5515-61-4-abe697
出版者	IOP Publishing
引用统计
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/120712
专题	中国科学院合肥物质科学研究院
通讯作者	Ding,F.; Luo,G.-N.
作者单位	1.Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China 2.University of Science and Technology of China, Hefei 230026, China 3.Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung-Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany 4.Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Chinese Ministry of Education, School of Physics, Dalian University of Technology, Dalian 116024, China
推荐引用方式 GB/T 7714	Chen,X.H.,Ding,F.,Wang,L.,et al. The impact of ELM mitigation on tungsten source in the EAST divertor[J]. Nuclear Fusion,2021,61.
APA	Chen,X.H..,Ding,F..,Wang,L..,Sun,Y.W..,Ding,R..,...&Hu,J.S..(2021).The impact of ELM mitigation on tungsten source in the EAST divertor.Nuclear Fusion,61.
MLA	Chen,X.H.,et al."The impact of ELM mitigation on tungsten source in the EAST divertor".Nuclear Fusion 61(2021).