Ka波段高压缩比电子光学系统的分析与设计

Analysis and Design of a Ka-band High Compression Ratio Electron Optical System

微波电真空器件向高功率、高频率、宽频带、高效率和小型化方向发展,对电子光学系统的要求也日益增高。文中设计了工作于Ka波段的扩展互作用速调管(Extended Interaction Klystron, EIK)高压缩比电子枪,利用二维仿真软件E-GUN和三维仿真软件Opera-3D对轴对称电子束在均匀永磁聚焦磁场内运动状态进行建模并仿真计算。相关结果表明,在阳极电压25 kV、注电流2.5 A、阴极面电流密度不超过12 A/cm^2的条件下,面压缩比约为85,电子注以良好的刚性通过互作用区域。

Microwave vacuum electronic devices are developing toward high power,high frequency,high efficiency,wide band and compactness,and the requirement for the electron optical system is increasing.In this paper,an electron gun with high compression and stability working in Ka-band is designed.The transmission of axial symmetric electron beams in a uniform permanent magnetic field is mathematically modeled and numerically simulated with E-GUN and Opera-3 D codes.The simulation results show that the novel electron gun has a beam current of 2.5 A,and an area compression ratio of nearly 85,when the anode voltage is 25 kV.The emission current density on the cathode is less than 12 A/cm^2.This highly compressed electron beam can smoothly pass through the interaction region with good stiffness.