title: Space-resolved vacuum ultraviolet spectrometer system for edge impurity and temperature profile measurement in HL-2A.
abstract: 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 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 are set on a rotatable holder in the spectrometer, which gives wavelength dispersion of 0.12 mm/A. A back-illuminated charge-coupled device is used as a detector with an image size of 6.7 x 26.6 mm(2) (26 x 26 microm(2)/pixel). An excellent spatial resolution of 2 mm is obtained with good spectral resolution of 0.15 A when the space-resolved slit of 50 microm 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)/2s(2)-2s2p (977 A). 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.
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China. cuizy@swip.ac.cn
authors.forename: Zhengying
authors.initials: Z
authors.lastname: Cui
authors.forename: Shigeru
authors.initials: S
authors.lastname: Morita
authors.forename: Bingzhong
authors.initials: B
authors.lastname: Fu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Huang
authors.forename: Ping
authors.initials: P
authors.lastname: Sun
authors.forename: Yadong
authors.initials: Y
authors.lastname: Gao
authors.forename: Yuan
authors.initials: Y
authors.lastname: Xu
authors.forename: Chunfeng
authors.initials: C
authors.lastname: Dong
authors.forename: Ping
authors.initials: P
authors.lastname: Lu
authors.forename: Quanming
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authors.lastname: Wang
authors.forename: Xuantong
authors.initials: X
authors.lastname: Ding
authors.forename: Qingwei
authors.initials: Q
authors.lastname: Yang
authors.forename: Xuru
authors.initials: X
authors.lastname: Duan