Experimental response of the divertor particle flux to internal transport barrier dynamics in EAST high-beta(N) discharges

doi:10.1088/1741-4326/ab668c

	Experimental response of the divertor particle flux to internal transport barrier dynamics in EAST high-beta(N) discharges
	Long, F. F.1,2; Ming, T. F.1; Zhang, T.1; Meng, L. Y.1,2; Wu, M. Q.3,4; Xu, J. C.1,2; Gao, S. L.1,2; Ye, K. X.1,2; Zhou, F.1,2; Zhuang, Q.1,2
刊名	NUCLEAR FUSION
	2020-03-01
卷号	60
关键词	internal transport barrier high normalized beta divertor particle flux Shafranov shift tokamak
ISSN号	0029-5515
DOI	10.1088/1741-4326/ab668c
通讯作者	Ming, T. F.(tfming@ipp.ac.cn)
英文摘要	Experiments in EAST have concentrated on studying the internal transport barrier (ITB) regime in high normalized beta () discharges, where the study of the compatibility between ITB dynamics and divertor plasmas is an important step for future steady-state and high-performance plasma operations. In this work, the characteristics of the divertor particle flux and their responses to ITB dynamics have been studied in high- discharges. In order to describe the characteristics, the ITB duration is divided into two phases: phase I (i.e. ITB formation) and phase II (i.e. ITB degradation), according to the variation of plasma stored energy. In phase I, the particle flux near the inner strike point (SP) is continuously enhanced during the inter-edge-localized mode (ELM) phase in both the lower single-null and upper single-null configurations. The total particle flux in the scrape-off layer (SOL) region reveals a similar trend with an increase of the flux near the SP. However, in the private flux region (PFR) the total particle flux shows a reduction. Meanwhile, a movement of the SP away from the divertor corner is also observed during the ITB formation. In phase II, the particle flux near the inner SP, the total particle flux in the inner SOL and PFR region recover to their initial level before ITB formation, respectively. Additionally, the particle decay length is obviously reduced in phase I and then gradually enhanced in phase II. The continuous variation of the particle flux at the inner divertor target is in accordance with a compression of the magnetic flux surfaces due to ITB formation, which increases the gradient of electron density in the edge region. It is indicative that the ITB has a feasible impact on the behavior of divertor plasmas by means of increasing the Shafranov shift during the inter-ELM phase.
资助项目	National Key R&D Program of China[2017YFE0301205] ; National Key R&D Program of China[2017YFE0300501] ; National Natural Science Foundation of China[11975271] ; National Natural Science Foundation of China[11605244] ; National Natural Science Foundation of China[11675211] ; National Natural Science Foundation of China[11875294]
WOS关键词	DENSITY PROFILE ; TOKAMAK ; SHEAR ; EQUILIBRIUM ; PLASMAS ; PHYSICS ; MODE ; REFLECTOMETRY ; STABILITY ; OPERATION
WOS研究方向	Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000520090000001
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/103811]
专题	中国科学院合肥物质科学研究院
通讯作者	Ming, T. F.
作者单位	1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, Peoples R China 3.Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Peoples R China 4.Shenzhen Univ, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov, Coll Optoelect Engn, Shenzhen 518060, Peoples R China
推荐引用方式 GB/T 7714	Long, F. F.,Ming, T. F.,Zhang, T.,et al. Experimental response of the divertor particle flux to internal transport barrier dynamics in EAST high-beta(N) discharges[J]. NUCLEAR FUSION,2020,60.
APA	Long, F. F..,Ming, T. F..,Zhang, T..,Meng, L. Y..,Wu, M. Q..,...&Gao, X..(2020).Experimental response of the divertor particle flux to internal transport barrier dynamics in EAST high-beta(N) discharges.NUCLEAR FUSION,60.
MLA	Long, F. F.,et al."Experimental response of the divertor particle flux to internal transport barrier dynamics in EAST high-beta(N) discharges".NUCLEAR FUSION 60(2020).