行波提取型同轴渡越时间振荡器模拟  

Numerical study of a coaxial transit-time oscillator with travelling-wave output structure

作　　者：令钧溥[1] 贺军涛[1] 张建德[1] 曹亦兵[1] 白现臣[1] 

机构地区：[1]国防科技大学光电科学与工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2013年第6期120-125,共6页Journal of National University of Defense Technology

基　　金：国家高技术发展计划项目;国家自然科学基金资助项目(61171021)

摘　　要：提出了一种行波提取型同轴渡越时间振荡器,器件的提取腔采用了类膜片加载的扩展互作用腔结构,具有束波作用效率高,电子束空间电势能低等优点。提取腔的电场结构为3π/2模,与传统的类π模结构相比,提高了微波群速度,有利于微波能量的提取。通过引入前置反射腔,提高了调制腔的品质因数,显著降低了起振时间。利用数值模拟软件对所设计的器件进行了模拟和优化,在二极管电压530kV,二极管电流12.8kA,外加导引磁场0.7T的条件下,得到了2.41GW的输出功率,微波频率7.76GHz,束波功率转换效率达到35.5%。A coaxial transit-time oscillator with travelling-wave output structure is proposed. The extractor of this device adopts an extended interaction cavity loaded with washer-like structure, which has the advantage of high beam-wave interaction efficiency and low space charge potential energy. The extractor operating at 3π/2 mode not ,π-like mode improves the group velocity of wave, which is favorable for RF extraction. The loaded quality factor of the buncher is increased by introducing a prior reflector, which can obviously reduce the starting time of microwave. The device is designed and optimized by a PIC （particle-in-cell） code. With the voltage 530 kV,the current 12.8 kA and the guiding magnetic field 0. 7 T, the output power is 2.41GW at the main frequency 7.76GHz, and the efficiency of beam-to-microwave power conversion is about 35.5 %.

关 键 词：行波提取结构 类膜片加载 渡越时间振荡器 提取腔 粒子模拟 

分 类 号：TN752.5[电子电信—电路与系统]