基于解析法的X光分幅相机静态增益特性仿真

采用解析法对X光分幅相机中微通道板单孔内电子运动、碰壁和二次发射一系列过程进行了建模与求解，依托商业Lorentz-2D软件，得到了二次电子初能量分布、电子碰壁前能量分布、渡越时间分布等仿真曲线。实验测量了分幅相机的静态灵敏度曲线，与仿真结果对比分析表明：光电子首次碰撞深度是影响相机增益的重要因素，给出了修正后的增益与电压关系表达式，定性分析了工作偏压等参数对首次碰撞深度的影响。

Abstract

Analytic method is employed to simulate courses of electronic transportation, collision and secondary emission in a MCP single channel. With the use of commercially available software Lorentz-2D, we obtain such curves as initial energy distribution of secondary electrons, electron energy distribution just before colliding with the channel wall, and electron transit time distribution. These simulation results can serve as references when developing a new framing camera or trying to improve its performance. MCP sensitivity is measured, compared with simulation results, it is found that first collision will actually affect the gain of MCP. Qualitative analysis shows that parameters like bias voltage make significant impacts on the depth of first collision. According to what is observed in simulation, empirical equation of gain versus voltage, which is based on Eberhardt's discrete dynode model, is corrected to better fit measurements.

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杨志文, 陈韬, 袁铮, 刘慎业, 肖沙里. 基于解析法的X光分幅相机静态增益特性仿真[J]. 强激光与粒子束, 2011, 23(8): 2205. Yang Zhiwen, Chen Tao, Yuan Zheng, Liu Shenye, Xiao Shali. Analytic simulation research on steady-state characteristics of X-ray framing camera[J]. High Power Laser and Particle Beams, 2011, 23(8): 2205.

基于解析法的X光分幅相机静态增益特性仿真

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