On electron-optical spatial and temporal aberrations in a bi-electrode spherical concentric system with electrostatic focusing
On electron-optical spatial and temporal aberrations in a bi-electrode spherical concentric system with electrostatic focusing
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DOI：
10.1117/12.848050
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发表时间：
2009-07
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影响因子：
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通讯作者：
Li-wei Zhou;H. Gong;Zhi-quan Zhang;Yi-fei Zhang
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文献类型：
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作者：
Li-wei Zhou;H. Gong;Zhi-quan Zhang;Yi-fei Zhang
对于由两个静电聚焦电极组成的同心球系统，静电势分布和电子运动的时空轨迹可用解析形式表示。因此，很自然地将这种系统作为一种理想模型来研究其成像特性和时空像差，分析其特殊性，寻找其普适性和非普适性的线索。该问题的研究不仅为研究夜视管的静态成像提供了理论依据，而且为研究高速变像管的动态成像提供了理论依据。本文从静电聚焦双电极同心球系统的实际电子射线方程和电子运动方程出发，求解了从光阴极发射的运动电子的时空轨迹，导出了象位和到达时间的精确和近似公式。从时空轨迹的解出发，讨论了该系统的电子光学时空特性，定义并推导了不同阶数的傍轴像差和几何横向像差，以及不同阶数的傍轴像差和几何时间像差，并将它们按（εz/Φac）1/2和（εr/Φac）1/2的阶数进行分类
For a concentric spherical system composed of two electrodes with electrostatic focusing, the electrostatic potential distribution and the spatial-temporal trajectory of electron motion can be expressed by analytical forms. It is naturally to take such system as an ideal model to investigate the imaging properties, as well as the spatial-temporal aberrations, to analyze its particularity and to find the clue of universalities and regularities. Research on this problem can afford academic foundation not only in studying the static imaging for the night vision tube, but also in studying the dynamic imaging for high speed image converter tube. In the present paper, based on the practical electron ray equation and electron motion equation for a bi-electrode concentric spherical system with electrostatic focusing, the spatial-temporal trajectory of moving electron emitted from the photocathode is solved, the exact and approximate formulae for image position and arriving time, have been deduced. From the solution of spatial-temporal trajectory the electron optical spatial and temporal properties of this system are then discussed, the paraxial and geometrical lateral aberrations with different orders, as well as the paraxial and geometrical temporal aberrations with different orders, are defined and deduced, that are classified by the order of (εz/Φac)1/2 and (εr/Φac)1/2