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

Fan ZHOU (周凡); Tingfeng MING (明廷凤); Yumin WANG (王嵎民); Feifei LONG (龙飞飞); Qing ZHUANG (庄清); Shaocheng LIU (刘少承); Guoqiang LI (李国强); Xiang GAO (高翔); the EAST team

doi:10.1088/2058-6272/ab1b1b

Plasma Science and Technology > 2019 > 21(9): 95101-095101. > DOI: 10.1088/2058-6272/ab1b1b

Fan ZHOU (周凡), Tingfeng MING (明廷凤), Yumin WANG (王嵎民), Feifei LONG (龙飞飞), Qing ZHUANG (庄清), Shaocheng LIU (刘少承), Guoqiang LI (李国强), Xiang GAO (高翔), the EAST team. Observation of filament-like structures in ELMy H-mode plasma with a VUV imaging system developed on the EAST tokamak[J]. Plasma Science and Technology, 2019, 21(9): 95101-095101. DOI: 10.1088/2058-6272/ab1b1b

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

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

Funds: This work is supported by the National Natural Science Foundation of China (Nos. 11605244, 11875294, 11505221), and the National Magnetic Confinement Fusion Science Program of China (Nos. 2014GB106000 and 2014GB106001).

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Received Date: October 22, 2018
Revised Date: April 15, 2019
Accepted Date: April 18, 2019

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Abstract

Abstract

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 (ρ₀and w₀ denote the mode location and mode width, respectively) is derived by a comparison of the synthetic images and the experimental imaging data.
- VUV,
- ELMs,
- SVD,
- filament-like structure,
- mode number

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References

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