两电极静电同心球系统的成像电子光学及其空间-时间像差  

Imaging electron-optics and spatial-temporal aberrations for a bi-electrode spherical concentric system with electrostatic focusing

作　　者：周立伟[1] 公慧[1] 张智诠[2] 张轶飞[2] 

机构地区：[1]北京理工大学光电学院,北京100081 [2]装甲兵工程学院控制工程系,北京100072

出　　处：《物理学报》2010年第8期5450-5458,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60771070)资助的课题~~

摘　　要：基于实际轨迹方程和电子运动方程对两电极静电同心球系统求解由光阴极逸出的运动电子的空间和时间轨迹,推导成像位置和电子飞行时间的精确和近似表达式,并由空间和时间轨迹的解析解出发讨论系统的空间-时间特性.对空间像差和时间像差给出统一的定义,即横向像差可视为近轴横向像差和几何横向像差的合成,时间像差可视为近轴时间像差和几何时间像差的合成,并导出了所有相应的像差表示式.In the present paper,based on the practical electron ray equation and the electron motion equation,for a bi-electrode concentric spherical system with electrostatic focusing,the spatial-temporal trajectories of moving electrons emitted from the photocathode are obtained,the exact and the approximate formulae for image position and flight time of electrons are deduced. Starting from the solutions of spatial-temporal trajectories,the electron optical spatial-temporal properties of this system are then discussed. A unified definition of spatial-temporal aberrations is given,in which the lateral aberration can be regarded as a combination of paraxial lateral aberration and geometrical lateral aberration; and the temporal aberration can be regarded as a comibination of paraxial temporal aberration and geometrical temporal aberration. All expressions of these corresponding aberrations are deduced.

关 键 词：静态成像电子光学 动态成像电子光学 空间像差和时间像差 两电极静电同心球系统 

分 类 号：O463.1[机械工程—光学工程]