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文章给出电阻盒式静电偏转器场分布和象差的简单计算公式。这种静偏器的场分布与选取合适“调节参数”的多极静偏器的场分布具有相同分布模式。经简化后,十六个象差系数公式只有九项积分运算,且没有光轴电场强度分布的二阶导数。给出光轴电场强度分布的近似公式,从而偏转场分布可以用解析表达式确定,象差系数的计算也更为方便、简单。
The article gives a simple formula for the field distribution and aberration of a box-type electrostatic deflector. The field distribution of this type of polarizer has the same distribution pattern as the field distribution of a multi-pole static separator that selects a suitable “adjustment parameter”. After simplification, the sixteen coefficients of aberration formulas have only nine integral operations and no second derivative of the optical axis electric field intensity distribution. The approximate formula of the electric field intensity distribution of the optical axis is given, so that the deflection field distribution can be determined by analytic expression. The calculation of aberration coefficient is also more convenient and simple.