用差分法解磁场方程求真空中场空间磁场分布

Solution of Magnetic Field Equation to the Magnetic Flux Distribution in Vacuum by Difference Method

为进行电子束电子光学计算机辅助设计计算，通过对稳定磁场方程分析，给出了磁场方程的一般形式，推导了圆柱坐标系下的磁场方程表达式，建立了数值计算差分格式，确定了对具体屏铁尺寸进行网络剖分的方法，提出了用差分法解磁场方程求真空中场空间磁场分布的计算机数值解法。为实现电子枪高精度辅助设计提供技术准备。

In order to carry on computer aided design and calculation of electron beam gun, through analyzing stable magnetic field equation, the magnetic equation is given, the expression of magnetic equation on cylindrical is deduced, the difference forms of numerical value calculation is established. Corresponding to concrete ferromagnet size, the method of cutting network is determined. The solution of magnetic field equation to magnetic flux distribution in vacuum by difference method is put forward. The calculation method makes a technical preparation for computer aided design of electron beam gun.