Suzuki C, Ida K, Kobuchi T, Yoshinuma M
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan.
Rev Sci Instrum. 2008 Oct;79(10):10E929. doi: 10.1063/1.2953676.
Energy resolved soft x-ray imaging system using a charge coupled device camera and a multifilter disk has recently been installed to the Large Helical Device for the measurements in the long pulse discharges. Eight images with different cutoff energies are measured sequentially during a single discharge by rotating a filter disk mounting eight beryllium filters with different thicknesses. A tangential line-integrated profile for a specific photon energy range can be obtained by taking intensity difference between two images measured with a filter pair of adjacent thicknesses. The typical photon energy corresponding to each difference ranges from 1.9 to 4.8 keV with the bandwidth of 2-3 keV. In the initial results, the difference in the line-integrated soft x-ray profile by the energy range has been clearly observed. This diagnostic method can possibly be applied to the observation of the dependence of two dimensional soft x-ray profile on photon energy range especially if local non-Maxwellian component appears in electron energy distribution function.
最近，一台使用电荷耦合器件相机和多滤光片盘的能量分辨软X射线成像系统已安装到大型螺旋装置上，用于长脉冲放电测量。在单次放电过程中，通过旋转安装有八个不同厚度铍滤光片的滤光片盘，依次测量八张具有不同截止能量的图像。通过获取用相邻厚度的滤光片对测量的两张图像之间的强度差，可以得到特定光子能量范围的切线积分轮廓。每个差值对应的典型光子能量范围为1.9至4.8keV，带宽为2 - 3keV。在初步结果中，已清楚观察到线积分软X射线轮廓在能量范围内的差异。这种诊断方法可能适用于观察二维软X射线轮廓对光子能量范围的依赖性，特别是当电子能量分布函数中出现局部非麦克斯韦分量时。
