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Experimental study on the magnetic coherent mode in the H-mode pedestal of EAST

文献类型：期刊论文

作者Chen, Ran3; Zhang, Heng3; Xu, Guosheng3; Zhou, Chu2; Li, Yongliang3; Ye, Yang3; Shi, Tonghui3; Liu, Haiqing3; Zhang, Tao3; Gao, Wei3
刊名NUCLEAR FUSION
出版日期2018-11-01
卷号58期号:11页码:20
ISSN号0029-5515
关键词magnetic coherent mode pedestal edge-localized mode divertor particle flux
DOI10.1088/1741-4326/aab96e
通讯作者Xu, Guosheng(gsxu@ipp.ac.cn)
英文摘要Here we report the experimental analysis on the low-n (mostly n = 1, sometimes n = 2) magnetic coherent mode (MCM) at a characteristic frequency 20-60 kHz, which has been frequently observed in various H-mode discharges on EAST. This mode can be easily identified in the magnetic fluctuations measured by the fast Mirnov coils mounted on the vacuum vessel wall, but is detected by the local measurements of edge electrostatic fluctuations only when the mode is sufficiently strong. The apperance of the MCM is summarized covering broad ranges of discharge parameters, in particular, the different heating schemes including pure neutral beams injected in either co- or counter-current direction as well as pure ratio-frequency waves. This may rule out the possibility of fast particle driven modes. Radial distribution and poloidal propagation of the MCM are investigated using the Doppler backscattering system and Langmuir probes inserted at the outer midplane, respectively. Temporal evolution of MCM amplitude during large ELM crashes is evaluated in detail, may suggesting the mode is closely correlated with pedestal buildup. Dedicated experiments reveal the possible correlations of MCM's frequencies with edge line-averaged density and edge safety factor q(95). We also present the observation of multi MCMs at relatively high q(95), which are speculated locating at different rational surfaces in the pedestal via analyzing their mode structures and nonlinear interactions. Finally, effect of the MCM on edge particle transport is explored via surveying the correlation between the intermittent events of the mode and the particle fluxes deposited on the divertor target plates, utilizing the conditional analysis method. Corresponding results suggest that the MCM seems to primarily result in a notable poloidal redistribution of the divertor particle flux, rather than a considerable net increase of the total flux.
WOS关键词ALCATOR C-MOD ; EDGE LOCALIZED MODES ; ASDEX UPGRADE ; DIII-D ; PARTICLE LOSSES ; DENSITY LIMITS ; ELM ENERGY ; CONFINEMENT ; TOKAMAK ; PLASMAS
资助项目National Natural Science Foundation of China[11675220] ; National Natural Science Foundation of China[11505220] ; National Natural Science Foundation of China[11575235] ; National Natural Science Foundation of China[11422546] ; National Magnetic Confinement Fusion Science Program of China[2015GB101000] ; National Magnetic Confinement Fusion Science Program of China[2013GB107003]
WOS研究方向Physics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000445960500002
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Magnetic Confinement Fusion Science Program of China ; National Magnetic Confinement Fusion Science Program of China ; National Magnetic Confinement Fusion Science Program of China ; National Magnetic Confinement Fusion Science Program of China ; National Magnetic Confinement Fusion Science Program of China ; National Magnetic Confinement Fusion Science Program of China ; National Magnetic Confinement Fusion Science Program of China ; National Magnetic Confinement Fusion Science Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Magnetic Confinement Fusion Science Program of China ; National Magnetic Confinement Fusion Science Program of China ; National Magnetic Confinement Fusion Science Program of China ; National Magnetic Confinement Fusion Science Program of China ; National Magnetic Confinement Fusion Science Program of China ; National Magnetic Confinement Fusion Science Program of China ; National Magnetic Confinement Fusion Science Program of China ; National Magnetic Confinement Fusion Science Program of China
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/39209]  
专题合肥物质科学研究院_中科院等离子体物理研究所
通讯作者Xu, Guosheng
作者单位1.Forschungszentrum Julich, Inst Energie & Klimaforsch Plasmaphys, EURATOM Assoc, D-52425 Julich, Germany
2.Univ Sci & Technol China, Dept Modern Phys, CAS Lab Geospace Environm, Hefei 230026, Anhui, Peoples R China
3.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Ran,Zhang, Heng,Xu, Guosheng,et al. Experimental study on the magnetic coherent mode in the H-mode pedestal of EAST[J]. NUCLEAR FUSION,2018,58(11):20.
APA Chen, Ran.,Zhang, Heng.,Xu, Guosheng.,Zhou, Chu.,Li, Yongliang.,...&Wan, Baonian.(2018).Experimental study on the magnetic coherent mode in the H-mode pedestal of EAST.NUCLEAR FUSION,58(11),20.
MLA Chen, Ran,et al."Experimental study on the magnetic coherent mode in the H-mode pedestal of EAST".NUCLEAR FUSION 58.11(2018):20.

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来源：合肥物质科学研究院

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