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Modelling and application of a new method to measure the non-thermal electron current in the edge of magnetically confined plasma
Liu, S. C.1; Liang, Y.1,2; Zhang, H. X.1,3; Yan, N.1; Liao, L.1,3; Zhang, X. X.1,3; Liu, X. J.1; Wei, W. Y.1,3; Zhao, N.4; Chen, L.1; Chen, R.1; Hu, G. H.1; Ming, T. F.1; Sun, Y.1; Qian, J. P.1; Zeng, L.1; Li, G. Q.1; Wang, L.1; Xu, G. S.1; Gong, X. Z.1; Gao, X.1
2021-12-01
Source PublicationNUCLEAR FUSION
ISSN0029-5515
Corresponding AuthorLiang, Y.(y.liang@fz-juelich.de) ; Yan, N.(yanning@ipp.ac.cn)
AbstractThe non-thermal electrons could form considerable current in the edge plasma of tokamak and stellarator. A new method, named directional electron probe (DEP), is proposed to measure the edge non-thermal electron current in magnetically confined plasma. The DEP consists of two opposite channels whose connection line aligns with the local magnetic field line. Each channel has a hole with small radial width and enough thickness to block high energy ions due to their large Larmor radii, and at the end of the hole the collector is biased to positive voltage to repel low energy ions. In this way, the collected current of DEP is mainly contributed by electrons. A particle orbit simulation is performed based on the Boris algorithm, which demonstrates the validity and rationality of the DEP. According to the simulation, the ion collection probability is quite small if compared with the electron collection probability, consequently the collected current is mainly contributed by electrons. The collected currents of thermal electrons under Maxwell-Boltzmann distribution from both channels are almost equal, and the net current is driven by non-thermal electrons. A radial array of DEP has been successfully applied to the scrape-off layer (SOL) non-thermal electron current measurement in EAST. The amplitude and structure of the non-thermal electron current are observed during the lower hybrid wave heating phase. The experimental SOL net current is compared with the simulated net current from a rough estimation, revealing the same radial structure of SOL current and demonstrating the validity of DEP.
Keywordnon-thermal electron SOL current directional electron probe Boris push plasma EAST
DOI10.1088/1741-4326/ac2aba
WOS KeywordION TEMPERATURE ; TOKAMAK PLASMA ; MACH PROBE
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[11875294] ; National Natural Science Foundation of China[11875292] ; National Natural Science Foundation of China[11922513] ; National Natural Science Foundation of China[U19A20113] ; National Natural Science Foundation of China[11975271] ; National MCF Energy R D Program[2017YFE0301100] ; National MCF Energy R D Program[2019YFE03040000] ; National MCF Energy R D Program[2019YFE03030000] ; National MCF Energy R D Program[2017YFE0301300] ; Users with Excellence Program of Hefei Science Center, CAS[2021HSC-UE014]
Funding OrganizationNational Natural Science Foundation of China ; National MCF Energy R D Program ; Users with Excellence Program of Hefei Science Center, CAS
WOS Research AreaPhysics
WOS SubjectPhysics, Fluids & Plasmas
WOS IDWOS:000709985400001
PublisherIOP Publishing Ltd
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.hfcas.ac.cn:8080/handle/334002/125592
Collection中国科学院合肥物质科学研究院
Corresponding AuthorLiang, Y.; Yan, N.
Affiliation1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
2.Forschungszentrum Julich, Inst Energie & Klimaforsch Plasmaphys, Trilateral Euregio Cluster TEC, D-52425 Julich, Germany
3.Univ Sci & Technol China, Hefei 230026, Peoples R China
4.Southwest Univ Sci & Technol, Sch Sci, Mianyang 621010, Sichuan, Peoples R China
First Author AffilicationChinese Academy of Sciences, Institute of Plasma Physics, Hefei 230031, Anhui, Peoples R China
Corresponding Author AffilicationChinese Academy of Sciences, Institute of Plasma Physics, Hefei 230031, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Liu, S. C.,Liang, Y.,Zhang, H. X.,et al. Modelling and application of a new method to measure the non-thermal electron current in the edge of magnetically confined plasma[J]. NUCLEAR FUSION,2021,61.
APA Liu, S. C..,Liang, Y..,Zhang, H. X..,Yan, N..,Liao, L..,...&Gao, X..(2021).Modelling and application of a new method to measure the non-thermal electron current in the edge of magnetically confined plasma.NUCLEAR FUSION,61.
MLA Liu, S. C.,et al."Modelling and application of a new method to measure the non-thermal electron current in the edge of magnetically confined plasma".NUCLEAR FUSION 61(2021).
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