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研究了三轴相对论速调管放大器(TRKA)的模式泄漏和自激振荡问题,对干扰模式的电场分布进行了分析,得知干扰模式在谐振腔中为TM21模,而在同轴漂移管中耦合为TE21模。针对干扰模式的传输特点采用在同轴漂移管中加载吸波材料的方式进行抑制,通过三维粒子仿真软件分析了吸波材料的电导率和几何参数对微波吸收的影响,根据仿真分析结果,对同轴漂移管中加载吸波材料的TRKA结构进行了三维模拟研究,结果表明吸波材料能够很好抑制TRKA的自激振荡,模拟仿真实现TRKA输出微波功率1.1GW,效率37%,增益42d B。
The problem of mode leakage and self-oscillation of tri-axial relativistic klystron amplifier (TRKA) is studied. The electric field distribution of the interference mode is analyzed. It is found that the mode of interference is TM21 mode in the resonator, Coupled to TE21 mode. According to the transmission mode of interference mode, the method of loading absorbing material in coaxial drift tube is adopted to suppress the influence of microwave absorption by the conductivity and the geometric parameters of absorbing material through 3D particle simulation software. According to the results of simulation analysis, The results show that the absorbing material can restrain TRKA spontaneous oscillation well. The simulation results show that TRKA output microwave power is 1.1GW, efficiency is 37%, gain is 42d B .