W波段低电压三次谐波回旋振荡管

Study of W-band low voltage third-harmonic gyrotron oscillator

回旋振荡管采用三次谐波工作方式的互作用磁场只有基波状态磁场的三分之一,可有效降低设计难度,具有广阔的应用前景。通过对三段式单腔结构的耦合系数、起振电流、高频场分布、模式竞争以及注波互作用研究,确定了工作模式为TE_(03)的W波段低电压三次谐波回旋振荡管的基本工作参数;通过粒子模拟软件(PIC)模拟分析,在电子注电压、注电流及速度比分别为35 kV、4 A和1.6时,在93.7 GHz频点处获得15.57 kW的输出功率,效率约11.1%,且该管可在此工作模式下稳定工作。

The third harmonic operation is of special significance due to its low magnetic field requirement for a gyrotron oscillator.By using a single cavity theory to analyse couple factor,start current,mode completion and beam-wave interaction,the operating parameters of the W-band low voltage TE03 mode third harmonic gyrotron oscillator are determined.Employing a Particle In Cell(PIC)code,the gyrotron oscillator is simulated.The results show that this oscillator can generate 15.57 kW output power at 93.7 GHz with over 11%of efficiency in case of 35 kV,4 A electron beam with a velocity ratio of 1.6,and a stable operation of the device is predicted.