静电聚焦同心球系统的成像电子光学C章:多电极同心球系统的电子光学

Imaging Electron Optics of Electrostatic Focusing Concentric Spherical System Part C:Electron Optics of Concentric Spherical System Composed of Multiple Electrodes

鉴于两电极静电聚焦同心球系统成像的定焦性质,当该系统的几何尺寸相对关系给定后,像面位置与放大率也就随之确定,改变系统的电参量引起的像面位置和放大率的变动是极其微小的。研究在由光阴极与栅状阳极组成的两电极同心球系统中插入任意多个栅极后,该系统的电子光学成像特性及其横向像差的变化规律。再次证实了在多电极静电聚焦同心球系统中,成像电子光学系统的二级近轴横向色差即Recknagel-Apцимович公式依然成立。着重讨论了三电极静电聚焦同心球系统的电子光学成像特性。

In view of the fixed-focus nature of imaging of the bi-electrode electrostatic focusing concentric spherical system,the image plane position and the magnification of system are immediately determined when the geometry of the system is relatively fixed;if the electrical parameters of the system are changed,the changes of the image plane position and its magnification will be extremely tiny.This paper studies the variations of the electron optical imaging characteristics and its lateral aberrations when inserting a large number of gate electrodes into the bi-electrode electrostatic focusing concentric spherical system composed of the photocathode and the anode.This paper once again confirms that for the multi-electrode electrostatic focusing concentric spherical system,the second-order paraxial lateral chromatic aberration of the imaging electronic optical system,i.e.,the Recknagel-Apцимовичformula,is still valid.The electron optical imaging characteristics of the tri-electrode electrostatic focusing concentric spherical system are emphatically discussed.