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

Observation of filament-like structures in ELMy H-mode plasma with a VUV imaging system developed on the EAST tokamak
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使用 EAST 托卡马克开发的 VUV 成像系统观察 ELMy H 模式等离子体中的丝状结构

DOI:
10.1088/2058-6272/ab1b1b
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发表时间:
2019-07
影响因子:
1.7
通讯作者:
Gao Xiang
Gao Xiang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhou Fan;Ming Tingfeng;Wang Yumin;Long Feifei;Zhuang Qing;Liu Shaocheng;Li Guoqiang;Gao Xiang

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在EAST托卡马克装置上,利用高速真空紫外(VUV)成像系统在ELMy H模放电中观测到了类顺磁结构。通过对原始VUV成像数据进行奇异值分解(SVD)分析,可以同时获得拓扑、时间和它们的权重。在Chronos的边缘局域模(ELM)碰撞阶段和基座恢复阶段,观测到涨落幅度分别被抑制和逐渐增强,而在Topos的基座恢复阶段,只能发现类顺从结构.模式结构,即m/n= 36/9(m和n分别是极向和环向模式数),
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, ie m/n= 36/9 (m and n are the poloidal and toroidal mode number, respectively) with
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