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针对过模返波振荡器中泄漏微波在二极管区谐振,造成微波脉冲缩短的现象,设计了内置吸波材料的阳极结构来抑制这种泄漏微波对器件输出的影响。利用粒子模拟软件对不同阳极结构下过模返波管微波输出特性进行模拟研究,模拟结果表明,带吸波材料的阳极结构可以减小泄漏微波对微波输出功率、器件工作模式及脉冲宽度的影响。在长脉冲过模返波振荡器实验中,电子束参数为(800kV,7kA)时,器件输出微波频率为8.58GHz,效率为30%。通过模拟计算和实验验证,这种带吸波材料的阳极结构有效降低了泄漏微波对过模返波管微波输出的影响,将器件输出微波脉冲宽度从70ns提高到110ns。
Aiming at the phenomenon that the leaking microwave in the over-mode-back-wave oscillator resonates in the diode region and shortens the microwave pulse, an anode structure with a built-in absorbing material is designed to suppress the influence of the leaked microwave on the output of the device. The simulation results of the microwave output characteristics of over-mode backbones under different anode structures were simulated by using particle simulation software. The simulation results show that the anode structure with absorbing materials can reduce the influence of microwave leakage on microwave output power, device operating mode and pulse width . In long pulse overmold return wave oscillator experiment, when the electron beam parameter is (800kV, 7kA), the output microwave frequency of the device is 8.58GHz, the efficiency is 30%. Through the simulation and experimental verification, the anode structure with absorbing material effectively reduces the influence of leaked microwave on the microwave output of the overmoulding tube, and increases the output microwave pulse width of the device from 70ns to 110ns.