Space-resolved vacuum ultraviolet spectrometer system for edge impurity and temperature profile measurement in HL-2A

作者：Cui Zhengying^*; Morita Shigeru; Fu Bingzhong; Huang Yuan; Sun Ping; Gao Yadong; Xu Yuan; Dong Chunfeng; Lu Ping; Wang Quanming; Ding Xuantong; Yang Qingwei; Duan Xuru

来源：Review of Scientific Instruments, 2010, 81(4): 043503.

DOI：10.1063/1.3378288

• bremsstrahlung
• diffraction gratings
• discharges (electric)
• plasma boundary layers
• plasma diagnostics
• plasma impurities
• plasma temperature
• plasma toroidal confinement
• Tokamak devices
• ultraviolet spectrometers

A 1 m normal incidence vacuum ultraviolet (VUV) spectrometer has been developed for spatial distribution measurement of edge impurity line emission in the wavelength range of 300-3200 A degrees on HL-2A tokamak. A vertical profile of the impurity line emission is measured with a space-resolved slit placed between an entrance slit and a grating of the spectrometer. Two concave 1200 grooves/mm gratings blazed at 800 and 1500 A degrees are set on a rotatable holder in the spectrometer, which gives wavelength dispersion of 0.12 mm/A degrees. A back-illuminated charge-coupled device is used as a detector with an image size of 6.7x26.6 mm(2) (26x26 mu m(2)/pixel). An excellent spatial resolution of 2 mm is obtained with good spectral resolution of 0.15 A degrees when the space-resolved slit of 50 mu m in width is used. The space-resolved spectra thus provide three radial profiles of emission line intensity, ion temperature, and poloidal rotation. The electron temperature can be measured by the intensity ratio, e.g., CIII 2s(2)-2s3p (386 A degrees)/2s(2)-2s2p (977 A degrees). The sensitivity of the spectrometer is calibrated in situ by using the VUV bremsstrahlung continuum radiation emitted from the tokamak plasma. A good performance of the spectrometer system for the edge impurity and temperature profile measurements is presented with results on Ohmic and H-mode discharges.

• 出版日期2010-4
• 单位核工业西南物理研究院