径向三腔预调制型同轴虚阴极振荡器数值模拟  

Numerical Simulation of a Coaxial Vircator with Radial Three-Cavity Premodulation

作　　者：区杰俊 邵浩[2,3] 宋志敏[2,3] 张余川[2,3] 廖成[1] 

机构地区：[1]西南交通大学电磁场与微波技术研究所,成都610031 [2]西北核技术研究所,西安710024 [3]高功率微波技术重点实验室,西安710024

出　　处：《现代应用物理》2015年第2期113-117,137,共6页Modern Applied Physics

基　　金：国家自然科学基金资助项目(11175144)

摘　　要：径向三腔预调制型同轴虚阴极振荡器的三腔调制腔结构由3个半开放式同轴谐振腔构成,能起到显著的束流调制作用,从而提高了电子束与微波场的耦合效率。数值模拟结果表明:改变调制腔长度可对系统工作频率进行调谐,其效率为3 dB时的调谐带宽约为400 MHz。经过优化设计,在二极管输入电压约为600 kV,发射电流约为60 kA的条件下,获得了平均功率约为7.2 GW,工作频率为2.67 GHz的微波输出,束波转换效率达到20%。This paper presents a new coaxial vircator with radial three-cavity premodulation composed of three coaxial resonant cavities, which can effectively modulate the injection beam, and thus reinforce the beam-wave interaction. The simulation results show that the microwave frequency can be tuned by adjusting the length of the modulation cavity, and the frequency tuning bandwidth at half the power level is about 400 MHz. After optimization, applying a 600 kV voltage and a 60 kA current of the diode, the output power of the microwave averages 7.2 GW at operating frequency of 2.67 GHz, and the conversion efficiency reaches 20 %.

关 键 词：虚阴极振荡器 预调制 三腔调制腔 调谐 

分 类 号：TN125[电子电信—物理电子学]