Optical design of the Lyman alpha based beam emission spectroscopy (LAB) diagnostic on the HL-2A tokamak

Yixuan ZHOU (周艺轩); Huajie WANG (王华杰); Yi YU (余羿); Yihang CHEN (陈逸航); Rui KE (柯锐); Min XU (许敏); Chijie XIAO (肖池阶); Zhanhui WANG (王占辉); Jiquan LI (李继全); Xuru DUAN (段旭如); Minyou YE (叶民友)

doi:10.1088/2058-6272/ac0327

Plasma Science and Technology > 2021 > 23(7): 75105-075105. > DOI: 10.1088/2058-6272/ac0327

Yixuan ZHOU (周艺轩), Huajie WANG (王华杰), Yi YU (余羿), Yihang CHEN (陈逸航), Rui KE (柯锐), Min XU (许敏), Chijie XIAO (肖池阶), Zhanhui WANG (王占辉), Jiquan LI (李继全), Xuru DUAN (段旭如), Minyou YE (叶民友). Optical design of the Lyman alpha based beam emission spectroscopy (LAB) diagnostic on the HL-2A tokamak[J]. Plasma Science and Technology, 2021, 23(7): 75105-075105. DOI: 10.1088/2058-6272/ac0327

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Optical design of the Lyman alpha based beam emission spectroscopy (LAB) diagnostic on the HL-2A tokamak

¹ Southwestern Institute of Physics, Chengdu 610041, People's Republic of China
² School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, 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

Funds: This work is supported by the National Key R&D Program of China (Nos. 2017YFE0301201 and 2018YFE0303102), National Natural Science Foundation of China (Nos. 11875124 and 12075241).

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Received Date: February 08, 2021
Revised Date: May 12, 2021
Accepted Date: May 18, 2021

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Abstract

Abstract

In this article, we present the optical design of a novel diagnostic on the HL-2A tokamak, i.e. the 20-channel edge Lyman-alpha beam emission spectroscopy, which is a promising solution for edge density turbulence research on tokamaks, as it offers the possibility of density fluctuation measurement with a 3.3 mm spatial resolution while maintains a high temporal resolution of 1 μs. The optical path, including the reflective collection optics, the high-dispersion spectrometer, and the linear detector array, is carefully optimized to obtain a good image quality and a high throughput. The maximum root mean square radius of the collection optics is 64 μm. The detected photon flux is estimated to be about 10¹¹ photons/s/channel.
- Lyman-alpha line,
- LAB,
- BES,
- density fluctuation diagnostic

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References

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Optical design of the Lyman alpha based beam emission spectroscopy (LAB) diagnostic on the HL-2A tokamak