提出了一种新型的高功率虚阴极径向反射速调管振荡器,它结合了虚阴极振荡器容易起振和速调管微波产生效率较高的特点.利用虚阴极反射电子束对调制腔的正反馈,可以减小起振电流和起振时间,而且提高了微波产生效率.它是一种结构简单、紧凑的器件.用2.5维PIC程序对这种器件进行了数值模拟研究.得到的数值模拟结果表明,输入电压620 kV,电流25 kA,输出微波周期平均功率为2.5 GW.虚阴极振荡频率被锁定,频率为1.25 GHz.

A new idea about radial reflex klystron oscillator with a virtual cathode is brought forward to improve microwave power and efficiency.The radial reflex klystron oscillator is combined with a virtual cathode oscillator in one foldaway coaxial diode.The frequency of the virtual cathode oscillator is locked by the radial reflex klystron oscillator and the bunching of the reflex electron beam reflected by the virtual cathode is enhanced.A new type of radial reflex klystron oscillator with a virtual cathode is designed and simulated by 2.5 D PIC.The results of the simulation are presented.2.5 GW output power is generated with 620 kV voltage,25 kA beam current and the frequency is 1.25 GHz.