Experimental study of ELM-induced filament structures using the VUV imaging system on EAST

Bang LI (李邦); Tingfeng MING (明廷凤); Qing ZHUANG (庄清); Feifei LONG (龙飞飞); Shanlu GAO (高善露); Qiqi SHI (石奇奇); Yumin WANG (王嵎民); Xiaoju LIU (刘晓菊); Shaocheng LIU (刘少承); Long ZENG (曾龙); Xiang GAO (高翔)

doi:10.1088/2058-6272/abda9d

Plasma Science and Technology > 2021 > 23(3): 35104-035104. > DOI: 10.1088/2058-6272/abda9d

Bang LI (李邦), Tingfeng MING (明廷凤), Qing ZHUANG (庄清), Feifei LONG (龙飞飞), Shanlu GAO (高善露), Qiqi SHI (石奇奇), Yumin WANG (王嵎民), Xiaoju LIU (刘晓菊), Shaocheng LIU (刘少承), Long ZENG (曾龙), Xiang GAO (高翔). Experimental study of ELM-induced filament structures using the VUV imaging system on EAST[J]. Plasma Science and Technology, 2021, 23(3): 35104-035104. DOI: 10.1088/2058-6272/abda9d

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Experimental study of ELM-induced filament structures using the VUV imaging system on EAST

1 Anhui University, Hefei 230039, People’s Republic of China
2 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
3 University of Science and Technology of China, Hefei 230026, People’s Republic of China
4 Nanchang University, Nanchang 330031, People’s Republic of China
5 Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, People’s Republic of China

Funds: This work is supported in part by the National Key R&D Program of China (No. 2017YFE0301205), National Natural Science Foundation of China (Nos. 11975271, 12075284 and 12075283) and partly supported by Chinese Academy of President’s International Fellowship Initiative (Grant No. 2021 VMA0022). The authors are grateful to all collaborators of the EAST team for their contribution to the experiments.

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Received Date: October 14, 2020
Revised Date: January 07, 2021
Accepted Date: January 10, 2021

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Abstract

Abstract

A high-speed vacuum ultraviolet (VUV) imaging system has been developed on the Experimental Advanced Superconducting Tokamak (EAST), which selectively measures line emission with a central wavelength of 13.5 nm (CVI, n = 4–2). It has been employed to study edge/pedestal plasma behavior in EAST. Edge localized mode (ELM)-induced filament structures have been captured by the VUV imaging system during the ELMy high confinement mode discharge with both high temporal and spatial resolutions. The typical features (i.e. poloidal width and pitch angle) of the observed filaments are quantitatively characterized based on the VUV imaging data, and the dependence of these features on basic plasma parameters is analyzed. It is found that the poloidal width is proportional to the heating power, and the pitch angle is inversely proportional to the edge safety factor q₉₅. The scatterplot shows a positive trend between the poloidal width and the ELM amplitude defined by the relative change in stored energy. These results are based on the condition that the perturbation induced by ELMs is confined to a narrow layer in the plasma.
- filament,
- ELM,
- VUV imaging,
- H mode,
- EAST tokamak

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Periodical cited type(6)

1.	Deng, R., Ming, T., Li, B. et al. VUV imaging of type-I ELM filamentary structures and their temporal characteristics on EAST. Plasma Science and Technology, 2024, 26(11): 114002. DOI:10.1088/2058-6272/ad621c
2.	Li, B., Ming, T., Li, Y. et al. Experimental and simulation studies on ELM characteristics under a plasma current ramping up discharge on EAST. AIP Advances, 2024, 14(5): 055030. DOI:10.1063/5.0205427
3.	Deng, R.-J., Chen, L.-F., Ming, T.-F. et al. Edge detection of ELM filament structures by high-speed VUVI system on EAST \| [EAST 装置高速 VUVI 系统对 ELM 丝状结构的边缘检测]. Hejubian Yu Dengliziti Wuli/Nuclear Fusion and Plasma Physics, 2023, 43(4): 450-456. DOI:10.16568/j.0254-6086.202304013
4.	Li(李邦), B., Ming(明廷凤), T., Li(李彦龙), Y. et al. Experimental study on the spatial structures of filament during ELM crash in ELMy H-mode discharge on EAST. Plasma Physics and Controlled Fusion, 2023, 65(8): 085004. DOI:10.1088/1361-6587/acdcb9
5.	Hou, S., Ming, T., Shi, Q. et al. Experimental observations of naturally occurring dust using a high-speed vacuum ultraviolet imaging system in EAST. Plasma Science and Technology, 2023, 25(5): 055101. DOI:10.1088/2058-6272/acaaef
6.	Ming, T.F., Tang, T.F., Shi, Q.Q. et al. Study on filament width of type-I ELM in EAST using VUV imaging system and simulation. Nuclear Fusion, 2022, 62(12): 126039. DOI:10.1088/1741-4326/ac95ad

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Experimental study of ELM-induced filament structures using the VUV imaging system on EAST

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