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Comparison of dynamical features between the fast H-L and the H-I-L transition for EAST RF-heated plasmas
Chen, Liang1; Xu, Guosheng1,2; Shao, Lingming1; Gao, Wei1; Wang, Yifeng1; Duan, Yanmin1; Wang, Shouxin1; Ti, Ang1; Mao, Songtao1; Li, Miaohui1; Zhang, Xinjun1; Chen, Ran1; Hu, Guanghai1; Liu, Jianbin1; Xu, Jichan3; Yan, Ning1; Wu, Xingquan1; Nielsen, Anders Henry4; Rasmussen, Jens Juul4; Wang, Liang1,5; Gong, Xianzu1
2022
Source PublicationPHYSICA SCRIPTA
ISSN0031-8949
Corresponding AuthorXu, Guosheng(gsxu@ipp.ac.cn) ; Shao, Lingming(shaolm@ipp.ac.cn)
AbstractIn this paper, a comparison of dynamical features between the fast H-L and the H-I-L transition, which can be identified by the intermediate phase, or 'I-phase', has been made for radio-frequency (RF) heated deuterium plasmas in EAST. The fast H-L transition is characterized by a rapid release of stored energy during the transition transient, while the H-I-L transition exhibits a 'soft' H-mode termination. One important distinction between the transitions has been observed by dedicated probe measurements slightly inside the separatrix, with respect to the radial gradient of the floating potential, which corresponds to the E x B flow and/or the electron temperature gradient. The potential gradient inside the separatrix oscillates and persists during the stationary I-phase, and shows a larger amplitude than that before the fast H-L transition. The reduction of the gradient leads to the final transition to the L-mode for both the fast H-L and the H-I-L transition. These findings indicate that the mean E x B flow shear and/or edge electron temperature gradient play a critical role underlying the H-L transition physics. In addition, the back transition in EAST is found to be sensitive to magnetic configuration, where the vertical configuration, i.e., inner strike-point located at vertical target, favours access to the H-I-L transition, while the horizontal shape facilitates achievement of the fast H-L transition. The divertor recycling level normalized to electron density is higher before the fast H-L transition, as compared to that before the I-phase, which strongly suggest that the density of the recycled neutrals is an important ingredient in determining the back transition behaviour.
KeywordH-L transition I-phase mean E x B flow diamagnetic flows divertor recycling
DOI10.1088/1402-4896/ac4635
WOS KeywordHIGH-CONFINEMENT ; MODE ; TURBULENCE
Indexed BySCI
Language英语
Funding ProjectNational Magnetic Confinement Fusion Science Program of China[2019YFE03030000] ; National Natural Science Foundation of China[U19A20113] ; National Natural Science Foundation of China[1197050784] ; Science Foundation of Institute of Plasma Physics, Chinese Academy of Sciences[DSJJ-18-02] ; AHNSF[1808085J07] ; CASHIPS Director's Fund[BJPY2019A01] ; CASHIPS Director's Fund[YZJJ2020QN13]
Funding OrganizationNational Magnetic Confinement Fusion Science Program of China ; National Natural Science Foundation of China ; Science Foundation of Institute of Plasma Physics, Chinese Academy of Sciences ; AHNSF ; CASHIPS Director's Fund
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000740834700001
PublisherIOP Publishing Ltd
Citation statistics
Document Type期刊论文
Identifierhttp://ir.hfcas.ac.cn:8080/handle/334002/127110
Collection中国科学院合肥物质科学研究院
Corresponding AuthorXu, Guosheng; Shao, Lingming
Affiliation1.Chinese Acad Sci, Inst Plasma Phys, Hefei Inst Phys Sci, Hefei 230031, Peoples R China
2.Univ Sci & Technol China, Hefei 230026, Peoples R China
3.Anhui Univ Sci & Technol, Sch Mech Engn, Huainan 232001, Peoples R China
4.Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark
5.Dalian Univ Technol, Sch Phys & Optoelect Technol, Dalian 116024, 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
Chen, Liang,Xu, Guosheng,Shao, Lingming,et al. Comparison of dynamical features between the fast H-L and the H-I-L transition for EAST RF-heated plasmas[J]. PHYSICA SCRIPTA,2022,97.
APA Chen, Liang.,Xu, Guosheng.,Shao, Lingming.,Gao, Wei.,Wang, Yifeng.,...&Gong, Xianzu.(2022).Comparison of dynamical features between the fast H-L and the H-I-L transition for EAST RF-heated plasmas.PHYSICA SCRIPTA,97.
MLA Chen, Liang,et al."Comparison of dynamical features between the fast H-L and the H-I-L transition for EAST RF-heated plasmas".PHYSICA SCRIPTA 97(2022).
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