C波段长脉冲相对论返波管设计与实验  

Design and experiment of long-pulse C-band relativistic backward wave oscillator

作　　者：曹亦兵[1] 孙钧[1] 宋志敏[1] 范志强 吴平[1] 张余川[1] 滕雁[1] Cao Yibing;Sun Jun;Song Zhimin;Fan Zhiqiang;Wu Ping;Zhang Yuchuan;Teng Yan(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5期47-50,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(61401367);国家高技术发展计划项目

摘　　要：从抑制强场击穿的角度出发,结合传统理论和相关粒子模拟方法,设计并优化了工作于C波段的长脉冲相对论返波管。模拟中,利用强流相对论电子束的空间电荷场效应,将3GW功率水平下电动力学结构表面的最大发射电场控制在700kV/cm以下。利用实验室700L脉冲功率驱动源平台开展了相关实验验证,实验结果表明,通过合理的结构设计,在功率3GW级水平下,C波段相对论返波管中的脉冲缩短问题能够得到有效抑制。实验中,当工作电压760kV、电流为9.0kA时,在4.23GHz频点处获得的输出微波功率为2.8GW,微波脉冲半高宽约101ns,功率转换效率约41%,实验结果与模拟结果吻合较好。Increasing the single pulse energy is always one of the development targets in high power microwave(HPM)domain.Pulse shortening should be emphatically focused on and solved.Combining the classical theory and particle-in-cell simulation,a long-pulse C-band relativistic backward wave oscillator(RBWO)was designed and optimized.Using the space charge effect of the intense relativistic electron beam,the maximum field strength on the electrodynamic structure surface was no more than 700 kV/cm with about 3 GW output.Further,the related experiment was carried out based on the 700L high voltage pulse generator in our laboratory.As demonstrated by the studies,pulse shortening of the RBWO can be effectively suppressed at about 3 GW level through rational design.With a 760 keV,9.0 kA beam in the experiment,a 2.8 GW,4.23 GHz microwave was obtained in the far-field measurement.The pulse width was about 101 ns and the device efficiency was 41%.The experimental result agrees well with that obtained in the simulation.

关 键 词：高功率微波 相对论返波管 长脉冲 脉冲缩短 强场击穿 

分 类 号：TN125[电子电信—物理电子学]