微波管电子束的模拟计算

Improvements of Electron Optics Simulation Routine of Microwave Tubes

根据工程实际的需要,对目前使用的微波管电子光学计算程序进行一些改进。一方面重新设计了友好的人机交互界面,另一方面从改进电子枪阴极电子发射模型,考虑温度、相对论效应和电子初始能量等因素的影响,以及计算电子轨迹时采用变步长Runge-Kutta法等来修改原程序算法。通过计算结果的对比,表明改进程序更加接近实验结果,收敛性更好。

The widely-used electron optics software,based on the obsolete DOS system in simulation of the microwave tubes,were modified and upgraded to be compatible to WINDOW system and the latest development in the field.In addition to provision of a friendly human-computer interaction interface,the impacts of various factors,including the environment temperature,relativity effect and initial electron energy,on emission characteristics of the electron gun were carefully considered,in the modeling and software modification as well.Besides,a variable step-size Runge-Kunta algorithm was used to calculate the electron trajectories.The simulated results with the newly-modified software package were found to agree fairly well with those measured in experiments.