Ka波段TM_(02)模式低磁场相对论返波管初步实验研究  

Preliminary experimental study on a Ka-band RBWO operating at TM_(02) mode with low guiding magnetic field

作　　者：王东阳[1] 滕雁[1] 史彦超[1] 李爽[1] 吴平[1] 邓昱群 杨德文 陈昌华[1] Wang Dongyang;Teng Yan;Shi Yanchao;Li Shuang;Wu Ping;Deng Yuqun;Yang Dewen;Chen Changhua(Science and Technology on High Power Microwave Laboratory,Northwest Institute of Nuclear Technology, Xi＇an 710024, China)

机构地区：[1]西北核技术研究所高功率微波技术重点实验室,西安710024

出　　处：《强激光与粒子束》2018年第7期38-42,共5页High Power Laser and Particle Beams

摘　　要：对Ka波段TM_(02)模式低磁场相对论返波管的结构特点、工作原理进行了介绍,详细分析了该器件以TM_(02)模工作的模式选择机制。通过粒子模拟,该器件在1T引导磁场下获得了功率为493MW、频率29.3GHz的微波输出,工作模式及频率与理论设计相一致。随后,基于模拟中的结构参数开展了初步的实验研究,当二极管电压为580kV、电流为3.56kA、引导磁场1T时,获得了功率286MW、频率29.3GHz、脉宽约10ns的微波输出。实验获得的微波频率与数值模拟一致,但是微波功率与数值模拟结果有明显差异,并且微波脉冲后沿有明显的缩短,分析认为在低磁场下后端谐振腔链受到电子轰击是导致该问题的主要原因。The structure and working principle of a Ka-band RBWO operating at TM02 mode with low guiding magnetic field was introduced,and mechanism of the TM02 mode selection was analyzed.The PIC（particle-in-cell）simulation shows the output power and frequency of the RBWO were 493 MW and 29.3 GHz respectively with guiding magnetic field of 1 T.The operating mode and frequency were corresponding to the theoretic design.The experiment study was done based on the parameters in simulation.A 29.3 GHz millimeter wave with an output power of 286 MW and pulse width of 10 ns was obtained at guiding magnetic field,diode voltage and current of 1 T,580 kV and 3.56 kA respectively.The frequency of microwave in experiment was in accordance with that in simulation.However,the output power in experiment was much lower,and the pulse width was shortened at post end evidently,which was considered as a result of electrons bombarding at the post cascaded resonators.

关 键 词：相对论返波管 TM02模式 KA波段 低磁场 脉冲缩短 

分 类 号：TN125[电子电信—物理电子学]