Two-dimensional vacuum ultraviolet images in different MHD events on the EAST tokamak

Gao, Xiang; Ming, Tingfeng; Wang, Yumin; Zhou, Fan; Long, Fei; Zhuang, Qiya; Team, East

doi:10.1088/2058-6272/aa9477

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…On the EAST tokamak, a newly developed high-speed vacuum ultraviolet (VUV) imaging system [12] can be used to study the edge plasma behaviors, especially the ELM events, with both high temporal and spatial resolution. The dynamics of the twodimensional (2D) images of MHD instabilities, such as ELMs, tearing-like modes and disruptions, have been observed with this diagnostic [13].…”

Section: Introductionmentioning

confidence: 90%

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

Zhou¹,

Ming²,

Yu-min³

et al. 2019

Plasma Sci. Technol.

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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 r 0 =0.95, w 0 =0.07 (r 0 and w 0 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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Section: Introductionmentioning

confidence: 90%

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

Zhou¹,

Ming²,

Yu-min³

et al. 2019

Plasma Sci. Technol.

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“…Since the edge localized mode has a large mode number, an imaging diagnostic is one of the possible ways to visualize the edge MHD activity because ELMs are generally accompanied by large mode numbers. A VUV camera system for the imaging diagnostic is developed as a collaborative work in EAST to visualize the edge MHD activity during the H-mode phase with ELMs [60]. In addition, the collaboration is done in HL-2A by installing a SX camera system on a tangential port to enhance the signal intensity.…”

Section: Visualization Of Edge Mhd Activitiesmentioning

confidence: 99%

Fusion Research and International Collaboration in the Asian Region

Morita

et al. 2018

Plasma and Fusion Research

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Multispectral Schwarzschild imaging system for the extreme ultraviolet emission measurement of tokamak plasma

Si,

Yi,

Ming

et al. 2024

Opt. Express

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A multispectral extreme ultraviolet imaging system based on a separated multichannel Schwarzschild objective was developed for emission measurements of tokamak plasma, with a wide field of view, high spatial resolution, and multispectral resolution. Multiple energy responses were realized by depositing different multilayer coatings on each mirror, targeting the interesting spectral lines of common impurities, such as Ne, C, and W, observed in tokamak experiments. Direct-current magnetron sputtering in conjunction with mask reshaping was employed to fabricate highly uniform multilayers on large-curvature substrates, achieving a thickness control accuracy of ±0.1 nm. Furthermore, this paper proposes an assembly and adjustment scheme that transitions from single-channel centering to multichannel integration, ensuring high-precision alignment across all channels. The design, preparation, and experimental validation of the proposed system are reported. The system was experimentally validated in the Experimental and Advanced Superconducting Tokamak facility, successfully detecting all target spectral lines. The results of the study demonstrate the feasibility of electron temperature measurements using the proposed system.

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Two-dimensional vacuum ultraviolet images in different MHD events on the EAST tokamak

Cited by 3 publications

References 18 publications

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

Fusion Research and International Collaboration in the Asian Region

Multispectral Schwarzschild imaging system for the extreme ultraviolet emission measurement of tokamak plasma

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