Initial beam emission spectroscopy diagnostic system on HL-2A tokamak

Ke, R.; Wu, Y. F.; McKee, G. R.; Yan, Z.; Jaehnig, K.; Xu, M.; Kriete, M.; Lu, P.; Wu, T.; Morton, L. A.; Qin, X.; Song, X. M.; Cao, J. Y.; Ding, X. T.; Duan, X. R.

doi:10.1063/1.5039350

Title: Initial beam emission spectroscopy diagnostic system on HL-2A tokamak

Journal Article · 07 October 2018 · Review of Scientific Instruments

DOI: https://doi.org/10.1063/1.5039350 · OSTI ID:1610029

^[1];

^[2]; McKee, G. R. ^[3]; Yan, Z. ^[3]; Jaehnig, K. ^[3]; Xu, M. ^[4];

^[3]; Lu, P. ^[4]; Wu, T. ^[4];

^[3];

^[3]; Song, X. M. ^[4]; Cao, J. Y. ^[4]; Ding, X. T. ^[4]; Duan, X. R. ^[4]

Tsinghua Univ., Beijing (China); Southwestern Inst. of Physics (China); DOE/OSTI
Southwestern Inst. of Physics (China); Univ. of Wisconsin, Madison, WI (United States); Hefei Univ. of Technology (China)
Univ. of Wisconsin, Madison, WI (United States)
Southwestern Inst. of Physics (China)

A beam emission spectroscopy system is being developed and deployed on the HL-2A tokamak to measure local low wavenumber (k_⊥ρ_i < 1) density fluctuations by measuring the Doppler-shifted emission from a 50 kV deuterium heating neutral beam. High spatial resolution (Δr ≤ 1 cm, Δz ≤ 1.5 cm) measurements are achieved with customized in-vacuum optics. High frequency, high-gain preamplifiers sample the light intensity at a Nyquist frequency of 1 MHz and achieve a high S/N ratio via high optical throughput, low-noise preamplifiers, and high quantum efficiency photodiodes. A first set of 16 detector channels [configured in an 8 (radial) × 2 (poloidal) array] has been installed and tested at HL-2A, covering the radial range r/a = 0.8–1.1. The frequency and wavenumber spectra have been measured under different plasma conditions. Initial measurements have demonstrated the capability of measuring edge plasma density fluctuation spectra and the poloidal flow velocity fields with a high S/N ratio.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: FG02-08ER54999

OSTI ID:: 1610029

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 89; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

References (15)

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Overview of HL-2A recent experiments Xu, M.; Duan, X. R.; Liu, Yi Nuclear Fusion, Vol. 59, Issue 11 https://doi.org/10.1088/1741-4326/ab1d84	journal	July 2019

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