Observation of filament-like structures in ELMy H-mode plasma with a VUV imaging system developed on the EAST tokamak  

作　　者：Fan ZHOU Tingfeng MING Yumin WANG Feifei LONG Qing ZHUANG Shaocheng LIU Guoqiang LI Xiang GAO 周凡;明廷凤;王嵎民;龙飞飞;庄清;刘少承;李国强;高翔;EAST team(Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;University of Science and Technology of China, Hefei 230026, People's Republic of China)

机构地区：[1]Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China [2]University of Science and Technology of China, Hefei 230026, People's Republic of China

出　　处：《Plasma Science and Technology》2019年第9期19-24,共6页等离子体科学和技术（英文版）

基　　金：by the National Natural Science Foundation of China (Nos. 11605244, 11875294, 11505221);the National Magnetic Confinement Fusion Science Program of China (Nos. 2014GB106000 and 2014GB106001)

摘　　要：On the EAST tokamak,filament-like structures have been observed in ELMy H-mode discharges with a high-speed vacuum ultraviolet (VUV) imaging system.The topos,chronos and their weight can be obtained simultaneously by performing the so-called singular value decomposition (SVD) analysis of raw VUV imaging data.The fluctuation amplitude is observed to be suppressed and enhanced gradually in the edge localized mode (ELM) crash and pedestal recovery phase in the chronos,respectively,while filament-like structures can only be found in the pedestal recovery phase on the topos.The mode structure,i.e.m/n =36/9 (m and n are the poloidal and toroidal mode number,respectively) with ρ0 =0.95,w0 =0.07 (ρ0 and w0 denote the mode location and mode width,respectively) is derived by a comparison of the synthetic images and the experimental imaging data.On the EAST tokamak, filament-like structures have been observed in ELMy H-mode discharges with a high-speed vacuum ultraviolet（VUV） imaging system. The topos, chronos and their weight can be obtained simultaneously by performing the so-called singular value decomposition（SVD） analysis of raw VUV imaging data. The fluctuation amplitude is observed to be suppressed and enhanced gradually in the edge localized mode（ELM） crash and pedestal recovery phase in the chronos, respectively, while filament-like structures can only be found in the pedestal recovery phase on the topos. The mode structure, i.e. m/n?=?36/9（m and n are the poloidal and toroidal mode number, respectively） with ■0?=?0.95, w0?=?0.07（■0 and w0 denote the mode location and mode width, respectively） is derived by a comparison of the synthetic images and the experimental imaging data.

关 键 词：VUV ELMS SVD filament-like structure mode number 

分 类 号：TL[核科学技术]