同轴交错双栅行波管三维频域非线性注波互作用计算和比较

3D Frequency Domain Nonlinear Beam-Wave Interaction of Coaxial Staggered Double-Grating TWT:A Simulation and Comparison Study

建立了同轴交错双栅行波管三维频域非线性注波互作用模型和公式。通过利用仿真软件求解渐变衰减材料对波的衰减特性,并与本文模型和公式结合编入非线性计算程序,使程序中对渐变/跳变衰减对注波互作用影响有更准确的求解。在小结构横截面保证商业软件计算容量允许条件下,比较了本文程序与仿真软件计算的注波互作用结果,并在相对大尺寸下设计了Ka波段同轴交错双栅行波管,以证实模型的合理性和在高频率产生高功率的可能性。

3 D frequency domain nonlinear beam-wave interaction of coaxial staggered double-grating traveling wave tube（TWT） was mathematically modeled,theoretically analyzed by numerically solving the derived equations with CST code. The impact of the materials and structures on the wave attenuation behavior was investigated. The self-developed program based on the nonlinear model and equations more accurately describes the influence of the tapering/step attenuation on beam-wave interaction. The beam-wave interaction in a small cross-section model,because of limited computer capacity,was simulated with the nonlinear program and CST code,respectively. Moreover,the beam-wave interaction of the Ka-band TWT,designed with large cross-section,was simulated. The simulated results show that the new model works well and is capable of generating large power at a high frequency. We suggest that the results we reported be of some technological interest in development of coaxial staggered double-grating TWT with large cross-section.