磁聚焦分幅变像管空间分辨特性

Spatial resolution characteristics of magnetic focusing framing tube

摘要:

针对磁聚焦分幅变像管短磁透镜个数与微通道板(MCP)面曲率、成像范围、旋转角度之间的关系，采用蒙特卡罗方法、有限差分法和有限元法，分别对单磁透镜、双磁透镜和三磁透镜3种磁聚焦分幅变像管的空间分辨特性进行理论和实验研究。仿真结果表明，磁聚焦分幅变像管的短磁透镜个数越多，成像面曲率越小，像面越接近平面；随着短磁透镜个数的增加，成像范围也逐渐增大；同时，在MCP面落点位置处电子的旋转角度随着短磁透镜个数的增加而减小。采用3个磁透镜时，在阴极面直径36 mm内，磁聚焦分幅变像管空间分辨力为10 lp/mm。

Abstract:

Theoretical and experimental research of the spatial resolution characteristics of magnetic focusing framing tubes with single magnetic lens, double magnetic lenses and triple magnetic lenses are simulated and studied by Monte Carlo method, finite difference method and finite element method. The relationship among the number of short magnetic lenses and the surface curvature of Micro-Channel Plate(MCP), imaging range and rotation angle is studied. The results show that the more the number of short magnetic lenses, the smaller the curvature of the imaging surface, the flatter the image surface. The imaging range increases with the increase of the number of short magnetic lenses; the electron rotation angle at the MCP point decreases with the increase of the number of short magnetic lenses. With triple magnetic lenses, the spatial resolution of the framing tube is 10 lp/mm within the diameter of 36 mm.