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Space-resolved vacuum-ultraviolet spectroscopy for measuring impurity emission from divertor region of EAST tokamak

Plasma Science and Technology 2022年第6期24卷 14-22页

作者： Liang HE Yongcai SHEN Hongming ZHANG Bo LYU Cheonho BAE Huajian JI Chaoyang LI Jia FU Xuewei DU Fudi WANG Qiuping WANG Xianghui YIN Shunkuan WAN Bin BIN Yichao LI Shuyu DAI Institute of Plasma Physics HFIPSChinese Academy of SciencesHefei 230031People's Republic of China University of Science and Technology of China Hefei 230026People's Republic of China School of Physics and Materials Engineering Hefei Normal UniversityHefei 230601People's Republic of China Institute of Energy Comprehensive National Science CenterHefei 230026People's Republic of China School of Electrical Engineering University of South of ChinaHengyang 420001People's Republic of China Anhui Spectreation Instrument Co.Ltd Hefei 230088People's Republic of China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029People's Republic of China School of Physics Dalian University of TechnologyDalian 116024People's Republic of China

The measurement of impurity distribution in the divertor region of tokamaks is key to studying edge impurity ***,a space-resolved vacuum-ultraviolet(VUV)spectrometer is designed to measure impurity emission in the divertor region on *** good spectral resolution,an eagle-type VUV spectrometer with 1 m long focal length with spherical holograph grating is used in the *** light collection,a collimating mirror is installed between the EAST plasma and the VUV spectrometer to extend the observing range to cover the upper divertor *** types of detectors,i.e.a back-illuminated charge-coupled device detector and a photomultiplier-tube detector,are adopted for the spectral measurement and high-frequency intensity measurement for feedback control,*** angle between the entrance and exit optical axis is fixed at 15°.The detector can be moved along the exit axis to maintain a good focusing position when the wavelength is scanned by rotating the *** profile of impurity emissions is projected through the space-resolved slit,which is set *** spectrometer is equipped with two gratings with 2400 grooves/mm and2160 grooves/mm,*** overall aberration of the system is reduced by accurate detector *** a result,the total spectral broadening can be reduced to about 0.013 *** simulated performance of the system is found to satisfy the requirement of measurement of impurity emissions from the divertor area of the EAST tokamak.

关键词： impurity measurement vacuum-ultraviolet spectrometer EAST divertor

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