毫米波静电聚焦行波管电子光学系统的设计

介绍了静电聚焦方式在毫米波行波管中的独特优势,分析了周期静电聚焦场的建立方法。基于某Ka波段行波管,首先根据指标要求设计了强流电子枪并选择类梳齿状结构作为其慢波电路,然后对电子枪和类梳齿状慢波电路组成的电子光学系统进行了模拟计算,最后对慢波电路的关键尺寸进行了容差分析。结果显示,在周期静电场的作用下,电子注全部平稳地通过了慢波系统。良好的静态通过率为后续高效率的注-波互作用奠定了基础,证明了利用静电场聚焦毫米波行波管中大电流密度电子注的可行性。

Design of electron optical system of millimeter electrostatically focused traveling wave tube

This paper introduced the particular advantages of electrostatic focusing style in millimeter traveling wave tube and analyzed the methods to establish periodic electrostatic field. Based on a Ka band traveling wave tube, first we designed an intense current density electron gun and selected a comb-like shape as slow wave circuit. Then a numerical simulation on the electron optical system made up of an electron gun and a slow wave circuit was carried out. Finally we summarized tolerance for key sizes of the slow wave circuit. The results showed that one hundred-percent beam passed slow wave structure smoothly. The good static beam pass was a foundation stone for subsequent sufficient beam-wave interaction and it was proven that a large current density beam in millimeter traveling wave tube could be focused commendably by electrostatic field. Simultaneously, the summary for the tolerance could provide a reference for the design of the electron optical system of millimeter electrostatically focused traveling wave tube.