变阻抗相对论返波管的研究

根据相对论返波管（RBWO）的非线性理论，数值模拟了耦合阻抗单步跃变型RBWO效率与束流参量、耦合阻抗跃变位置、高低耦合阻抗比值的依赖关系，结果表明器件最优化效率可达到50%，设计制造了一个X波段高功率耦合阻抗单步跃变型RBWO，运用全电磁粒子模拟程序仿真了器件中注波互作用过程，预见出器件功率、效率、频率等性能参量，在电子注电流、注加速电压、互作用区长度相同的实验条件下，测得变阻抗器件实验效率约为均匀阻抗型器件效率的2倍。

RELATIVISTIC BACKWARD OSCILIATOR WITH VARIABLE COUPLE IMPEDANCE

The dependence of efficiency of a single step couple impedance jump variation relativistic backward wave oscillator(RBWO) on the relativistic electron beam parameters, couple impedance jump change position and high low couple impedance ratio was analyzed and optimized numerically by means of self consistent RBWO nonlinear theory presented in the paper. The results show that the optimal device efficiency can be up to 50%. A high power X band RBWO with a single step change in the couple impedance was designed and analyzed by using a full electromagnetic particle in cell code to simulate the device output power, efficiency and operating frequency. It was also constructed and investigated experimentally. The efficiency of the device with a single step change in the couple impedance is about twice of the uniform case in the same driving electron beam, beam wave interaction region length and other operating conditions has been achieved in the preliminary experiments.