X波段高效双频同轴相对论返波管粒子模拟

摘要

An X-band dual-frequency coaxial relativistic backward-wave oscillator with a resonant reflector is proposed in this paper. The 2. 5-D fully electromagnetic particle-in-cell code simulation results indicate that, with an electron beam of 520 kV and 8. 5 kA guided by an axial magnetic field of 2. 35 T, an average power of 1. 35 GW with power conversion efficiency of 30. 5% is obtained and the two dominant frequencies are 9. 41 GHz and 10. 29 GHz, respectively. Furthermore, the dual-frequency spectrum and the smaller dominant frequency demonstrate a periodic-like dependence on the drift waveguide, and a frequency agility bandwidth of about 400 MHz is acquired.%提出了一种能在X波段实现稳定双频输出的带有谐振反射器的高效率同轴相对论返波振荡器,并使用2.5维全电磁粒子PIC模拟软件进行了粒子模拟研究.模拟结果显示:在电子束电压520 kV、电流8.5kA、轴向引导磁场2.35T的条件下,器件实现了9.41 GHz和10.29 GHz的稳定双频输出,平均输出功率为1.35 GW,波束互作用效率为30.5％.此外,双频频谱及双频中较小的频率随着漂移段的变化而准周期地变化,实现了带宽约400 MHz的频率捷变输出.