圆柱面和圆锥面弯晶谱仪的理论计算及设计

Theoretical Calculation and Design for Cylindrical and Conical Bent Crystal Spectrograph

用光线追迹的方法对圆柱面和圆锥面弯晶谱仪进行了理论计算,得到了谱仪的空间与色散坐标、线色散率、角色散率、光谱分辨力、空间和光谱放大率以及谱仪亮度等参数的解析计算公式,并对两类谱仪进行了具体的参数设计及性能比较。结果表明,圆锥面弯晶谱仪比同类型的传统圆柱面弯晶谱仪有着更为良好的聚焦性能,能够进一步改善谱仪的光子收集效率、谱仪亮度以及空间分辨力。这项工作为谱仪研制提供了理论基础和设计依据。

A basic theoretical calculation for the cylindrical and conical bent crystal spectrocgraph was done by using ray tracing method and the explicite formulations of the parameters for these spectrographs, such as spatial and spectral dispersion coordinates, linear and angular dispersion, spectral resolution, spatial and spectral magnification, lominosity, were obtained. The two kinds of spectrographs are designed and their performace is compared. The results show that the conical bent crystal spectrograph is better than the same type of the cylindrical one on the focusing properties, which improves the efficiency of light gathering, luminosity and spatial resolution. This work provids a theoretical and design basis for the future manifacturing of spectrographs.