Development of high-speed vacuum ultraviolet spectroscopy using a modified Seya-Namioka monochromator and channel electron multiplier detector in the HL-2A tokamak

A high-speed vacuum ultraviolet monochromator is developed for the HL-2A tokamak through the introduction of a novel channel electron multiplier in a modified Seya-Namioka spectrometer. A good signal to noise ratio of above 2000 is attained in the development phase of the system with typical operati...

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Published inReview of scientific instruments Vol. 89; no. 10; p. 10D134
Main Authors Zhang, Kai, Zheng, Dianlin, Sun, Ping, Cui, Zhengying, Dong, Chunfeng, Lu, Ping, Fu, Bingzhong, Liu, Zetian, Shi, Zhongbing, Yang, Qingwei
Format Journal Article
LanguageEnglish
Published United States 01.10.2018
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Summary:A high-speed vacuum ultraviolet monochromator is developed for the HL-2A tokamak through the introduction of a novel channel electron multiplier in a modified Seya-Namioka spectrometer. A good signal to noise ratio of above 2000 is attained in the development phase of the system with typical operating parameters for observing routine HL-2A plasmas. The wavelength calibration is performed using characteristic line emissions from a hollow cathode light source with helium and argon discharges. The first measurement result of the monochromator at a sample rate of 60 kHz is presented in comparison with the visible Dα signals.
ISSN:1089-7623
DOI:10.1063/1.5037504