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提出了一种新型径向三腔同轴虚阴极振荡器,并进行了数值模拟研究.研究表明:这种径向三腔结构在束波转换面进行电场调制,能够大幅提高束波转换效率;同时,由阳极栅网和径向三腔结构构成的谐振装置能有效地抑制模式竞争;另外,由于采用了同轴引出结构,在提高能量引出的同时还能有效吸收漂移管中被利用过的电子,因此这种新型虚阴极振荡器能够获得较高的输出功率.模拟的电子束电压为400kV,电流为50kA,主频为4.5GHz,峰值功率达到6GW,平均输出功率为3.1GW,束波转换效率达到15%.
A new type of radial three-cavity coaxial virtual cathode oscillator is proposed and the numerical simulation is carried out. The results show that the radial three-cavity structure can modulate the electric field in the conversion surface, At the same time, the resonant device composed of the anode grid and the radial three-cavity structure can effectively restrain the mode competition. In addition, due to the adoption of the coaxial extraction structure, the energy extraction can be effectively absorbed while being utilized in the drift tube The new virtual cathode oscillator can obtain higher output power.The simulated electron beam voltage is 400kV, the current is 50kA, the frequency is 4.5GHz, the peak power is 6GW, the average output power is 3.1GW, Conversion efficiency of 15%.