阴极区热电子发射的数值模拟

NUMERICAL SIMULATION FOR THERMAL EMISSION OF CATHODE

在电子束及粒子束器件中，发射系统直接影响整个器件的质量。因此，对发射系统的分析就显得非常重要。对热阴极发射的数值计算方法做了一定的探讨。对常用的平板二极管模型进行了分析，从而了解了由于这种模型而引起的计算误差。针对这些问题，采用了一些其它的处理方法来模拟热阴极的电子发射。

In the electron beam and ion beam device, the emission system affects the quality of the whole device. Therefore it is very important to analyse the emission system in electron beam device. This paper studies the method of numerical simulation of the electron emission. The planar diode model which is often used to calculate the emission of cathode is discussed and the error caused in the numerical simulation is analysed. On the basis of these discussions, this paper uses another method to simulate the thermal emission of cathode more precisely.