平响应X射线光阴极的理论设计与计算模拟

Theoretical Design and Computational Simulation of Flat Response X-ray Photocathode

给出了适用于0.1~5keV的平响应X射线光阴极的设计方案.采用两层不同厚度、相同面积的相同金属材料制备X射线光阴极,两金属层的厚度和微观结构经过优化后,在惯性约束聚变实验感兴趣的能区具有良好的平响应特征,不需要复杂的解谱过程.选取4种不同的光阴极材料,改变厚度和占空比设计,计算得到了光阴极不平整度.模拟结果表明,该光阴极在0.1~5keV能量响应基本一致,不平整度优于5%.

A flat-response X-ray photocathode at the energy range of 0. 1- 5 keV was presented. The photocathode consists of two layers of metal material with same area and different thickness. After optimizing the thickness and microstructure of two metal layers, the proposed photocathode does not need complex corrections in the interested X-ray energy range of inertial confinement fusion experiment due to the flat-response characteristics. The flatness of the proposed X-ray photocathode with 4 kinds of materials respectively was simulated by adjusting the material, thickness and duty ratio. The simulation results show that the proposed photocathode has flat-response with flatness better than 5 % at the X-ray energy range of 0. 1 -5 keV.