具有谐振腔的多波切伦柯夫振荡器的粒子模拟

Particle simulation of the multiwave Cerenkov generator with a resonant cavity operation at low magnetic field

设计了一种新型的多波切伦柯夫振荡器,即在第二慢波段和输出喇叭之间加一个谐振腔,并采用PIC方法模拟了器件产生微波的物理过程。结果表明这种新型器件符合普通多波切伦柯夫振荡器的基本特征,同时具有纵向尺寸短,导引磁场低,功率、效率高等优点。

A new type high efficiency Multiwave Cerenkov Generator is designed by employing a resonant cavity between the second slow wave structure and the output horn,and its physical process is analyzed by means of 2.5 PIC simulation. It is shown that, due to the decelerating gap mechanism and coupling cavity mechanism of the resonant cavity, its output power and efficiency increase as its longitudinal length reduces and its guiding magnetic field be lowered greatly. A typical simulation result is that, at the magnetic field of 0.63T, an Xband microwave with the average output power of 1.8GW and the peak power of 4GW is obtained with the input power of 5.8GW, and the average efficiency is over 30%. 