反馈调制型同轴虚阴极振荡器

 对反馈调制型同轴虚阴极振荡器进行了理论分析和数值模拟研究,结果表明:该器件通过增加同轴谐振腔结构并引入反馈可以对入射电子束形成明显的调制效果，从而使得器件具有高束波转化效率和频率单一稳定的特性;同时输出微波的频率被器件结构中的同轴谐振腔锁定，调节腔参数可以在一定范围内对输出微波频率进行调谐;在二极管电压约为600 kV，电子束功率26.2 GW条件下，可以得到平均功率3.6 GW的微波输出，转换效率达到13.7%，主频为5.5 GHz，模式为TM₀₂模。

Coaxial vircator with feedback and beam modulation

Coaxial vircator with feedback and beam modulation is designed and studied by theoretical and PIC simulation methods. In the vircator, there are a coaxial resonant cavity that beams pass through and a coupling gap connecting the coaxial resonant cavity and the drift tube, and beam can be modulated before microwave generated in the coaxial resonant cavity. Then the modulation can be strengthened by microwave from the drift tube to the coaxial resonant cavity through the coupling gap. Simulation results and theoretical analysis show that the coaxial vircator has high beam-wave transform efficiency and point frequency. Meanwhile, it is found that the frequency of the microwave that the vircator generates is locked by the coaxial resonant cavity, which can be tuned by tuning the parameters of