The measurement of impurity distribution in the divertor region of tokamaks is key to studying edge impurity transport.Therefore,a space-resolved vacuum-ultraviolet(VUV)spectrometer is designed to measure impurity emission in the divertor region on EAST.For good spectral resolution,an eagle-type VUV spectrometer with 1 m long focal length with spherical holograph grating is used in the system.For 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 region.Two 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,respectively.The 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 grating.The profile of impurity emissions is projected through the space-resolved slit,which is set horizontally.The spectrometer is equipped with two gratings with 2400 grooves/mm and 2160 grooves/mm,respectively.The overall aberration of the system is reduced by accurate detector positioning.As a result,the total spectral broadening can be reduced to about 0.013 nm.The simulated performance of the system is found to satisfy the requirement of measurement of impurity emissions from the divertor area of the EAST tokamak.

Liang HE;Yongcai SHEN;Hongming ZHANG;Bo LYU;Cheonho BAE;Huajiatnw 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,HFIPS,Chinese Academy of Sciences,Hefei 230031,People's Republic of China;University of Science and Technology of China,Hefei 230026,People's Republic of China;School of Physics and Materials Engineering,Hefei Normal University,Hefei 230601,People's Republic of China;Institute of Energy,Comprehensive National Science Center,Hefei 230026,People's Republic of China;School of Electrical Engineering,University of South of China,Hengyang 420001,People's Republic of China;Anhui Spectreation Instrument Co.Ltd,Hefei 230088,People's Republic of China;National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,People's Republic of China;School of Physics,Dalian University of Technology,Dalian 116024,People's Republic of China

等离子体科学和技术（英文版）

[1]Liang HE;Yongcai SHEN;Hongming ZHANG;Bo LYU;Cheonho BAE;Huajiatnw JI;Chaoyang LI;Jia FU;Xuewei DU;Fudi WANG;Qiuping WANG;Xianghui YIN;Shunkuan WAN;Bin BIN;Yichao LI;Shuyu DAI-.Space-resolved vacuum-ultraviolet spectroscopy for measuring impurity emission from divertor region of EAST tokamak)[J].等离子体科学和技术（英文版）,2022(06):14-22

tokamaks,holograph

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