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

被引：0
|
作者：
周凡 [1 ,2 ]
明廷凤 [1 ]
王嵎民 [1 ]
龙飞飞 [1 ,2 ]
庄清 [1 ,2 ]
刘少承 [1 ]
李国强 [1 ]
高翔 [1 ,2 ]
EAST team [1 ]
机构：
[1] Institute of Plasma Physics, Chinese Academy of Sciences
[2] University of Science and Technology of
来源：
Plasma Science and Technology | 2019年 / 09期
关键词：
D O I：
暂无
中图分类号：
TL631.24 []; O53 [等离子体物理学];
学科分类号：
070204 ;
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 ■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.
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页码：23 / 28
页数：6
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