【摘要】 双通道椭圆弯晶谱仪(以下简称TCECS)是激光惯性约束核聚变(ICF)研究中非常重要的诊断仪器,在一个通道上用Χ光胶片或X＿CCD作空间分辨测量,在另一个通道上用Χ光条纹相机作时间分辨测量,从而同时获得Χ射线的空间和时间特性。TCECS传递效率的高低将影响摄谱效果,而TCECS的传递效率取决于柱面镜的反射率、晶体的积分衍射率、滤光膜的透射率和光谱相对孔径。本文从理论上分析了TCECS传递效率的四种影响因素与波长的关系,并用Matlab6.1软件进行了数值计算,表明TCECS的传递效率随Χ射线波长增大而减小,这对今后TCECS的结构设计具有重要的指导作用。更多还原

【Abstract】 The two_channel elliptical crystal spectrometer (TCECS) is a very important diagnostic instrument for researching inertial confinement fusion controlled by laser. Since spatial resolution is recorded by X_film or X_CCD in one channel, and time resolution is recorded by an X_streak camera in another channel, the spatial and time characteristics can be measured simultaneously. Spectrographic effects will be affected by the transmission efficiency of TCECS, which depends on the reflective ratio of a cylindrical mirror, the integrated diffraction of a crystal, the transmissivity of filter foil, and the spectrographic aperture ratio. The relations between these four influencing factors and wavelength are analyzed theoretically in this paper. The numerical calculations are done by using Matlab 6.1 software. It is indicated that transmission efficiency decreases as X_ray wavelength increases, which is very important to instruct the structural design.更多还原