Space-resolved vacuum ultraviolet spectrometer system for edge impurity and temperature profile measurement in HL-2A.
Space-resolved vacuum ultraviolet spectrometer system for edge impurity and temperature profile measurement in HL-2A.
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DOI：
10.1063/1.3378288
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发表时间：
2010-04
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影响因子：
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通讯作者：
Z. Cui;S. Morita;B. Fu;Yuan Huang;P. Sun;Yadong Gao;Yuan Xu;C. Dong;P. Lu;Quanming Wang;X. Ding;Qingwei Yang;X. Duan
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文献类型：
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作者：
Z. Cui;S. Morita;B. Fu;Yuan Huang;P. Sun;Yadong Gao;Yuan Xu;C. Dong;P. Lu;Quanming Wang;X. Ding;Qingwei Yang;X. Duan
在HL-2A装置上，研制了一台1m垂直入射真空紫外(VUV)光谱仪，用于测量300-3200A波长范围内边缘杂质线发射的空间分布。通过在入射狭缝和光谱仪的光栅之间放置空间分辨狭缝，测量了杂质线发射的垂直轮廓。在光谱仪的旋转支架上设置了两个800和1500 A的1200凹槽/mm光栅，其波长色散为0.12 mm/A。探测器采用背光电荷耦合器件，成像尺寸为6.7×26.6 mm(2)(26×26微米(2)/像素)。当采用宽度为50微米的空间分辨狭缝时，获得了2 mm的良好空间分辨率和0.15A的良好光谱分辨率。因此，空间分辨光谱提供了发射线强度、离子温度和极向旋转的三个径向分布。电子温度可以通过强度比来测量，例如CIII2s(2)-2s3p(386A)/2s(2)-2s2p(977A)。利用托卡马克等离子体发射的真空紫外韧致辐射连续辐射对光谱仪的灵敏度进行了现场标定。对欧姆放电和H模放电的测量结果表明，该光谱仪系统对边缘杂质和温度分布的测量具有良好的性能。
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.