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

论文摘要

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.

论文目录

• 1. Introduction
• 2. Experimental setup
• 3. The data analysis methods
• 4. Experimental results
• 5. Derivation of the mode structure
• 6. Summary and future work

文章来源

类型: 期刊论文

作者: 周凡,明廷凤,王嵎民,龙飞飞,庄清,刘少承,李国强,高翔,EAST team

来源: Plasma Science and Technology 2019年09期

年度: 2019

分类: 基础科学,工程科技Ⅱ辑

专业: 物理学,核科学技术

单位: Institute of Plasma Physics, Chinese Academy of Sciences,University of Science and Technology of China

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)

分类号: TL631.24;O53

页码: 23-28

总页数: 6

文件大小: 1042K

下载量: 13