行波管电子枪数值模拟设计的判定
Criteria of numerical simulation design for electron gun in TWT
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摘要: 提出了采用数值软件模拟法进行行波管电子枪设计时对电子注质量好坏的判断准则：电子枪应具有更好的阴极表面电子发射密度均匀性、电子注层流性、注腰位置附近电子注径向密度分布均匀性及某百分比电子注包络曲线的光滑性等。利用编写的软件对某行波管电子枪进行数值模拟设计时，不断调整电子枪的结构，应用以上设计准则，通过对电子注质量进行判定和比较，得到了相对更符合设计要求的电子枪结构。Abstract: This paper presents the criteria to judge the quality of electron-beam in designing the TWT’s electron gun by numerical simulation: uniform current density of cathode surface emission, good laminar flow property of the electron beam, uniform radial distribution of the beam near the beam waist and smooth of envelope which contain certain percent electrons. Designing the electron gun of a TWT by the code we have compiled code, judging and comparing the quality of beams of different structures, the better e-gun structure can be obtained.
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