Development of a 32-channel Beam Emission Spectroscopy diagnostic based on Neutral Beam Injection on HL-2A tokamak

Wu, Yifan; McKee, G. R.; Yu, Yijun; Ke, Rui; Yan, Z.; Jaehnig, Kurt P.; Xu, M.; Kriete, D. M.; Morton, L. A.; Qin, Xiaoxia; Nie, Lin; Wu, Tingting; Sun, A.P.; Lan, Tao; Yuan, Bin; Liu, Hongbin; Gong, Shuwen; Long, Ting; Duan, X.R.; Ye, M.Y.

doi:10.1016/j.fusengdes.2020.111734

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…There are mainly two kinds of transmission optics for BES diagnostics. One is the lens group [11,12], and the other is the combination usage of a few light-collection lenses and fibers [3,13]. Unfortunately, this rich experience is not suitable for LAB development.…”

Section: Transmission Opticsmentioning

confidence: 99%

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

Zhou¹,

Wang²,

Yu³

et al. 2021

Plasma Sci. Technol.

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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 10 11 photons/s/channel.

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Section: Transmission Opticsmentioning

confidence: 99%

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

Zhou¹,

Wang²,

Yu³

et al. 2021

Plasma Sci. Technol.

Self Cite

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Recent Progress of Optical and Spectroscopic Diagnostics for Turbulence on the HL-2A tokamak

Duan

et al. 2021

J Fusion Energ

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Integrated 2D beam emission spectroscopy diagnostic at the Huan-Liuqi-2A (HL-2A) tokamak

Qin

McKee

Yan

et al. 2022

Review of Scientific Instruments

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Two newly developed, eight-channel, integrated Beam Emission Spectroscopy (BES) detectors have been installed at Huan-Liuqi-2A tokamak, which extends the existing 16 single-channel modular BES system with additional 16 spatial channels. The BES collects the Doppler-shifted Balmer D α emission with a spatial resolution of 1 cm (radial) × 1.5 cm (poloidal) and a temporal resolution of 0.5 µs to measure long-wavelength ( k⊥ ρ i < 1) density fluctuations. Compared to the modular BES, the dark noise of the integrated BES is reduced by 50%–60% on average. The signal-to-noise ratio of the integrated BES system is optimized by the high light throughput front-end optics, high quantum efficiency photodiodes, high-gain, low-noise preamplifiers, and sufficient cooling capacity provided by the thermoelectric cooling (TEC) units that maintain the detectors at −20 °C. Crosstalk between channels that share the same optical system is found to be negligible. High-quality density fluctuation data enables 2D (radial–poloidal) imaging of turbulence, which allows for multi-channel spectral analysis, multi-channel cross-correlation analysis and velocimetry analysis. Preliminary results show that BES successfully captures the spatiotemporal features of the local turbulence and obtains statistically consistent turbulence characterization results.

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Development of a 32-channel Beam Emission Spectroscopy diagnostic based on Neutral Beam Injection on HL-2A tokamak

Cited by 4 publications

References 17 publications

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

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

Recent Progress of Optical and Spectroscopic Diagnostics for Turbulence on the HL-2A tokamak

Integrated 2D beam emission spectroscopy diagnostic at the Huan-Liuqi-2A (HL-2A) tokamak

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