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Physical mechanisms for the transition from type-III to large ELMs induced by impurity injection on EAST
Lin, X.1; Xu, G. S.1; Yang, Q. Q.1; Yan, N.1; Wang, Y. F.1; Ye, Y.2; Zhu, P.3,4; Cao, B.1; Li, K. D.1; Chen, R.1; Zhang, L.1; Zang, Q.1; Zhang, T.1; Wang, Y. M.1; Hu, G. H.1; Li, Y. Y.1; Zhou, C.5; Chen, Y. J.1; Meng, L. Y.1,5; Yang, X. D.1; Duan, Y. M.1; Liu, H. Q.1; Ding, F.1; Chen, X. H.1; Xu, J. C.1; Wu, M. F.1,5; Wang, L.1
2022-04-15
Source PublicationPHYSICS LETTERS A
ISSN0375-9601
Corresponding AuthorXu, G. S.(gsxu@ipp.ac.cn) ; Yang, Q. Q.(yangqq@ipp.ac.cn)
AbstractTransition from type-III to large-amplitude ELMs induced by neon injection has been observed in the EAST tokamak at overlapping q(95) space between large and small ELMs. With neon injection, pedestal density gradient shows a remarkable increase accompanied by some decrease of pedestal electron temperature, and consequently the pressure gradient increases moderately and edge bootstrap current has minimal change. Further experiment demonstrates that the occurrence of large ELMs after neon injection is highly correlated with the change in edge density. Linear peeling-ballooning stability analysis indicates that the large ELM case is more unstable than the type-III ELM case during the ELM transition. A scan of pedestal density gradient in linear stability analysis shows that the direct destabilizing effect of steep pedestal density gradient on peeling-ballooning instabilities via two-fluid effects could also facilitate the transition to large ELMs. These results could provide more insight into the role of pedestal density gradient on pedestal stability and ELM behavior. (C) 2022 Elsevier B.V. All rights reserved.
KeywordImpurity injection ELMs Pedestal density gradient EAST tokamak
DOI10.1016/j.physleta.2022.127988
WOS KeywordDIAMAGNETIC STABILIZATION ; DENSITY PROFILE ; EDGE ; INSTABILITIES ; CONFINEMENT ; TRANSPORT ; STABILITY ; PLASMAS ; MODES
Indexed BySCI
Language英语
Funding ProjectNational MCF Energy RD Program[2019YFE03030000] ; National Natural Science Foundation of China[12005257] ; National Natural Science Foundation of China[11922513] ; National Natural Science Foundation of China[11905143] ; National Natural Science Foundation of China[12005263] ; National Natural Science Foundation of China[11975275] ; China Postdoctoral Science Foundation[2020M671913] ; CASHIPS Director's Fund[YZJJ2020QN13] ; Key Research Program of Frontier Sciences, CAS[QYZDB-SSWSLH001] ; Fundamental Research Funds for the Central Universities at Huazhong University of Science and Technology[2019kfyXJJS193] ; National Magnetic Confinement Fusion Program of China[2019YFE03050004] ; US Department of Energy[DE-FG02-86ER53218] ; US Department of Energy[DE-SC0018001] ; Special Research Assistant Funding of CAS
Funding OrganizationNational MCF Energy RD Program ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; CASHIPS Director's Fund ; Key Research Program of Frontier Sciences, CAS ; Fundamental Research Funds for the Central Universities at Huazhong University of Science and Technology ; National Magnetic Confinement Fusion Program of China ; US Department of Energy ; Special Research Assistant Funding of CAS
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000755520500002
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.hfcas.ac.cn:8080/handle/334002/127899
Collection中国科学院合肥物质科学研究院
Corresponding AuthorXu, G. S.; Yang, Q. Q.
Affiliation1.Chinese Acad Sci, Inst Plasma Phys, HFIPS, Hefei 230031, Peoples R China
2.Hefei Comprehens Natl Sci Ctr, Inst Energy, Hefei 230031, Peoples R China
3.Huazhong Univ Sci & Technol, Sch Elect & Elect Engn, Int Joint Res Lab Magnet Confinement Fus & Plasma, State Key Lab Adv Electromagnet Engn & Technol, Wuhan 430074, Hubei, Peoples R China
4.Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA
5.Univ Sci & Technol China, Hefei 230026, 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
Lin, X.,Xu, G. S.,Yang, Q. Q.,et al. Physical mechanisms for the transition from type-III to large ELMs induced by impurity injection on EAST[J]. PHYSICS LETTERS A,2022,431.
APA Lin, X..,Xu, G. S..,Yang, Q. Q..,Yan, N..,Wang, Y. F..,...&Wang, L..(2022).Physical mechanisms for the transition from type-III to large ELMs induced by impurity injection on EAST.PHYSICS LETTERS A,431.
MLA Lin, X.,et al."Physical mechanisms for the transition from type-III to large ELMs induced by impurity injection on EAST".PHYSICS LETTERS A 431(2022).
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