论文部分内容阅读
多电子注折叠波导行波管是一类重要的太赫兹源器件。作为真空器件的重要组成部分,电子光学系统对器件的性能有十分重要的影响。本文首先论述了横向场对电子注聚焦的影响,并讨论了使用传统周期永磁聚焦系统的困难。为了克服横向场的影响,文中给出了使用周期会切磁场(PCM)结构设计的双电子注电子光学系统,并且从PCM的空间场分布出发,从理论上说明了采用PCM结构聚焦平面分布的多电子注的可行性。之后对仿真结果进行参数扫描,分析了电极对电子注聚焦的影响、以及磁场分布对电子注聚焦的影响。说明了在多注情况下,电子注在不同平面的聚焦情况不同,电子注在4 cm的聚焦结构内能保持良好的聚焦。
Multi-electron folded waveguide traveling wave tube is an important type of terahertz source device. As an important part of the vacuum device, the electronic optical system has a very important influence on the performance of the device. In this paper, the effect of transverse field on electron-beam focusing is discussed first, and the difficulties of using traditional periodic-magnet focusing system are discussed. In order to overcome the influence of transverse field, a two-electron injection electron optical system using periodic magnetic field (PCM) structure design is presented in this paper. From the point of spatial distribution of PCM, the theory of using PCM structure to focus planar distribution Feasibility of multiple electron injection. After that, the parameters of the simulation were scanned and the influence of the electrode on the electron-beam focusing and the effect of the magnetic field distribution on the electron-beam focusing were analyzed. It shows that under the condition of multiple injection, the electron injection has different focusing conditions in different planes. The electron injection can keep good focusing in the focusing structure of 4 cm.