微通道板输入端的电场分布影响光生电子的运动轨迹和近贴型像增强器的性能。由于微通道板内大量的微通道孔使微通道板和光阴极之间的电场分布复杂化，为此本文采用有限元仿真分析软件Ansoft Maxwell 3D模拟并建立了微通道板结构和像增强器中微通道板输入端电场分布的关系模型。根据电场模拟结果分析了微通道板中不同孔径直径、孔径间距、微通道板孔的倾斜角及扩口情况对通道板输入端处电场分布情况的影响。同时讨论了电场分布变化对光生电子的运动轨迹及分辨力的影响。这项研究对高品质的微通道板的制备提供了理论基础。

The electrostatic distributions between Micro-channel plate (MCP) and photocathode will affect the movement locus of photogenerated electrons and the proximity image intensifier′s performance. However the distributions of electrostatic fields and equipotential lines were complex due to a lot of micro-channel in the micro channel plate. So this paper simulated the electrostatic distribution of MCP input in proximity focusing low-light-level image intensifiers by the finite element simulation analysis software Ansoft Maxwell 3D. How the electrostatic distribution of MCP input were affected by micro-channel diameter, angle of micro-channel, minimum interspacing between micro-channels walls and flaring-condition of the input end of the channel were analyzed according to the simulation result. Meanwhile, the photogenerated electrons′ trajectory and image intensifier′s resolution affected by the change of electrostatic distribution were discussed. This study will provide a theory foundation for the fabrication of the high quality MCP.