Spectroscopic Measurements of Impurity Spectra on the EAST Tokamak  

作　　者：FU Jia LI Yingying SHI Yuejiang WANG Fudi ZHANG Wei LV Bo HUANG Juan WAN Baonian ZHOU Qian 

机构地区：[1]Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China [2]University of Science and Technology of China, Hefei 230039, China [3]WCI Center for Fusion Theory, National Fusion Research Institute, 52 Eoeun-Dong Yusung-Gu, Daejeon 305-333, South Korea [4]School of Natural Sciences, Anhui Agricultural University, Hefei 230036, China

出　　处：《Plasma Science and Technology》2012年第12期1048-1053,共6页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China （Nos. 10975155, 10990212, and 11175208）; National Magnetic Confinement Fusion Science Program （Nos. 2011GB101004, 2011GB107000, and 2012GB101001） and the Scientific Instrument Development Project of Chinese Academy of Sciences （No. YZ200922）

摘　　要：Ultraviolet （UV） and visible impurity spectra （200-750 nm） are commonly used to study plasma and wall interactions in magnetic fusion plasmas. Two optical multi-channel analysis （OMA） systems have been installed for the UV-visible spectrum measurement on EAST. These two OMA systems are both equipped with the Czerny-Turner （C-T） type spectrometer. The upper vacuum vessel and inner divertor baffle can be viewed simultaneously through two optical lenses. The OMA1 system is mainly used for multi-impurity lines radiation measurement. A 280 nm wavelength range can be covered by a 300 mm focal length spectrometer equipped with a 300 grooves/mm grating. The Da/Ha line shapes can be resolved by the OMA2 system. The focal length is 750 mm. The spectral resolution can be up to 0.01 nm using a 1800 grooves/mm grating. The impurity behaviour and hydrogen ratio evolution after boroniztion, lithium coating, and siliconization are compared. Lithium coating has shown beneficial effects on the reduction of edge recycling and low Z impurity （C, O） influx. The impurity expelling effect of the divertor configuration is also briefly discussed through multi-channels observation of OMA1 system.Ultraviolet （UV） and visible impurity spectra （200-750 nm） are commonly used to study plasma and wall interactions in magnetic fusion plasmas. Two optical multi-channel analysis （OMA） systems have been installed for the UV-visible spectrum measurement on EAST. These two OMA systems are both equipped with the Czerny-Turner （C-T） type spectrometer. The upper vacuum vessel and inner divertor baffle can be viewed simultaneously through two optical lenses. The OMA1 system is mainly used for multi-impurity lines radiation measurement. A 280 nm wavelength range can be covered by a 300 mm focal length spectrometer equipped with a 300 grooves/mm grating. The Da/Ha line shapes can be resolved by the OMA2 system. The focal length is 750 mm. The spectral resolution can be up to 0.01 nm using a 1800 grooves/mm grating. The impurity behaviour and hydrogen ratio evolution after boroniztion, lithium coating, and siliconization are compared. Lithium coating has shown beneficial effects on the reduction of edge recycling and low Z impurity （C, O） influx. The impurity expelling effect of the divertor configuration is also briefly discussed through multi-channels observation of OMA1 system.

关 键 词：OMA optical multi channel analysis BORONIZATION lithium coating wall condition TOKAMAK 

分 类 号：TH744[机械工程—光学工程] O433.1[机械工程—仪器科学与技术]