Progress of Lyman-alpha-based beam emission spectroscopy (LyBES) diagnostic on the HL-2A tokamak

Yixuan ZHOU; Yi YU; Min XU; Rui KE; Lin NIE; Hao XU; Guangyi ZHAO; Hao LIU; Zihao YUAN; Chenyu XIAO; Jiquan LI; Chijie XIAO; the HL-2A Team

doi:10.1088/2058-6272/ad162a

Plasma Science and Technology > 2024 > 26(3): 034016. > DOI: 10.1088/2058-6272/ad162a

Yixuan ZHOU, Yi YU, Min XU, Rui KE, Lin NIE, Hao XU, Guangyi ZHAO, Hao LIU, Zihao YUAN, Chenyu XIAO, Jiquan LI, Chijie XIAO, the HL-2A Team. Progress of Lyman-alpha-based beam emission spectroscopy (LyBES) diagnostic on the HL-2A tokamak[J]. Plasma Science and Technology, 2024, 26(3): 034016. DOI: 10.1088/2058-6272/ad162a

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Progress of Lyman-alpha-based beam emission spectroscopy (LyBES) diagnostic on the HL-2A tokamak

1.
Southwestern Institute of Physics, Chengdu 610041, People’s Republic of China
2.
Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, People’s Republic of China
3.
State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, People’s Republic of China

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Author Bio:
Yi YU: yuyi56@mail.sysu.edu.cn
Corresponding author:
Yi YU, yuyi56@mail.sysu.edu.cn
Received Date: July 03, 2023
Revised Date: December 13, 2023
Accepted Date: December 14, 2023
Available Online: March 03, 2024
Published Date: March 14, 2024

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Abstract

Abstract

An edge Lyman-alpha-based beam emission spectroscopy (LyBES) diagnostic, using a heating NBI (neutral beam injection) system, is currently under development on the HL-2A tokamak. The 20-channel edge LyBES, which is intended to measure the density fluctuation in plasma edge (from R = 1960 mm to R = 2026 mm) with an improved spatial resolution of 3.3 mm, is a complement to the existing conventional beam emission spectroscopy (BES) diagnostic. In this article, we introduce the progress of LyBES diagnostic, including the collection optics, the monochromator, and the detector system. The reflectance of the collection mirrors is measured to be ~82% at 122 nm, and the aberration geometrical radius of the collection optics is tested to be ~150 μm in the aimed area. The linear dispersion of the LyBES monochromator is designed to be ~0.09 nm mm⁻¹. The bandwidth of the detector system with the 5×10⁷ V A⁻¹ preamplifier gain is measured to be ~280 kHz, and the peak-to-peak noise of the detector system is tested to be ~16 mV. The finalized design, components development and testing of the LyBES diagnostic have been completed at present, and an overall performance of the LyBES diagnostic is to be confirmed in the next HL-2A campaign.
- density fluctuation,
- LyBES,
- BES,
- vacuum ultraviolet

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References

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Progress of Lyman-alpha-based beam emission spectroscopy (LyBES) diagnostic on the HL-2A tokamak