当基于微通道板(MCP)的光电探测器受到强辐射干扰时, MCP的饱和将导致探测器的时间分辨率和空间分辨率发生改变.本文建立了饱和工作状态下MCP电子云运动仿真模型, 与常规的线性工作状态的不同之处在于, 该模型考虑了MCP通道壁上累积的正电荷对通道内电子云运动特性的影响.仿真结果表明, 当MCP工作在线性状态, 电极浸入深度的不同对通道电子云能量分布有很大差异, 而工作在饱和状态, 通道电子云能量分布趋于一致.电子能量分布曲线与相关文献的实验数据拟合良好, 验证了模型的正确性.

The performance of microchannel plate (MCP) detectors, including the temporal and spatial resolutions, varies significantly for MCPs work in a saturated mode due to high intensity illumination. In this paper, the influence of positive charges which accumulate on inner channel wall was added to a electron cloud motion model. It is the main difference between the MCP model in a saturated and a non-saturated mode. The kinetic characteristics of the electron clouds were calculated and analyzed. Simulation results show that the Energy Distributions Of Electrons (EDOEs), in a saturated mode, have a similar shape for MCPs with different electrode penetrate depth. This is very different from the results obtained in a non-saturated case. It is concluded that these phenomena come from the accumulation of positive charges near the exit of the channel. The EDOEs fit well with the experimental data of related literature, which verifies the correctness of this model.