耦合腔行波管三维整管模拟

Three-Dimensional Whole-Tube Simulation of Coupled-Cavity Traveling-Wave Tube

电子枪是耦合腔行波管的核心部件之一，枪的电子束参数对行波管工作性能有重要影响。在使用PIC软件设计一S波段耦合腔行波管时，对电子枪进行了数值模拟，构建了行波管的三维整管计算模型，该模型包含电子枪、慢波结构、微波输入输出耦合器等部件，模拟了该S波段行波管整管的大信号注波互作用过程。模拟结果表明：在2．0～2．3GHz工作频带内，该行波管的连续波输出功率达5．9kW，效率为24％。整管模拟为行波管设计提供了依据。

Electron gun is one of the key components of coupled-cavity traveling-wave tube （TWT）. Its electron beam parameters have important influence on TWT performances. As a result, electron gun was firstly simulated when an S-band coupled-cavity TWT was designed using PIC software. Then, the three-dimensional simulation model of whole TWT was constructed, which consists of electron gun, slow-wave structure, microwave input and output coupler, etc. Finally, the large signal beam-wave interaction of the whole S-band TWT was simulated. Results show that the continuous wave output power reaches 5.9 kW and the efficiency reaches 24 % in the operating frequency range of 2.0-2.3 GHz. Whole-tube simulation provides reference for TWT design.