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本文研究了旋转对称磁透镜和磁偏转器的复合系统,给出了场和轨迹的普遍表达式。利用向量形式来描写电子轨迹,讨论了高斯光学性质。运用变分原理(费马原理)计算了三级象差,得出了复合系统普遍的象差公式。它们以矩阵的形式表出,形式简洁,便于进行数值计算。本文的结果具有较大的普遍性,概括了文献上关于偏转象差的已有结果,并对复合系统作了较完整的论述和严格的计算,因而可以广泛地研究各种电子束管和电子光学仪器的偏转象差。A combined magnetic round lens and deflection system with a superimposed field has been studied, and the power series expressions for the magnetic field is given. The electron trajectories are described in vector-form, and the Gaussian optical properties of the combined system discussed. By means of Fermat's principle general aberration formulae for the combined system have been derived. Equations for calculating the third-order aberration are given in compact matrix-form, hence they are suitable for numerical computation. This paper attempts to give a general theory of the combined system to provide guidance for designers of cathode ray tubes and electron optical instruments.
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