110 GHz回旋振荡管高频结构优化设计研究

Research on Optimal Design of High-Frequency Structure of a 110 GHz Gyrotron

基于广义传输线理论,得到描述谐振腔和注-波互作用特征参数的一阶传输线方程组;编写了冷腔和热腔模拟程序。利用自编程序和专业电磁仿真软件对同一折线渐变结构谐振腔的特征参数做模拟计算,证实了自编程序的可靠性。在工作模式选用TE22,6时,利用自编程序对两种110 GHz回旋振荡管谐振腔结构(折线渐变结构和圆弧渐变结构)中的模式纯度和注波互作用效率进行了模拟计算研究。结果表明,相对于折线渐变结构,圆弧渐变谐振腔的模式纯度可提高约4.7 dB,互作用效率提高约4%。在注电压96 kV,注电流40 A,互作用磁场约为4.41 T时,圆弧腔回旋振荡管在110.1 GHz输出功率超过1.9 MW,效率约为50%。

Based on generalized theory of transmission line,a set of partial differential equations of first orderare obtained to study characteristic parameters of cavity and beam-wave interaction of gyrotron.A calculationcode including“cold cavity”and“hot cavity”is developed.Taking the advantages of the code and commercial software,characteristic parameters of the same line-joint cavity are simulated.Correctness of the code is proved by simulation results.Purity of operating mode and efficiency of beam-wave interaction in two kinds of cavities,namely line-joint structure and arc-joint structure,are studied by the code when TE22,6mode is regarded as the operating mode of a110GHz gyrotron.As a result,compared with the line-joint cavity,purity of the operating mode and efficiency are raised about4.7dB and4%,respectively.In the gyrotron with an arc-joint cavity,an output power of1.9MW,corresponding to50%efficiency and an oscillation frequency of110.1GHz,has been achieved with a96kV,40A helical electron beam at a guiding magnetic field of4.41T.