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针对杂频振荡的影响,在三腔相对论速调管的基础上发展了四腔高增益相对论速调管。采用PIC粒子模拟软件,从整管上对四腔强流相对论速调管放大器的冷腔结构、束波互作用、微波提取等方面进行研究。为得到输出功率和效率的最优值,结构上采用了低互作用输入腔,设计了阶梯状结构漂移管,通过对输出腔作用间歇进行优化处理等措施抑制了电子回流和杂频振荡的抑制,实现了器件在高增益下的GW级高功率微波输出。模拟表明整管微波模拟输出功率达3.05 GW、效率22%、增益63 d B(种子微波功率2 k W),该器件在实验上获得了增益为61.4 d B(种子微波功率1.38 k W)高功率微波放大输出,微波脉冲宽度大于100 ns。
Aiming at the influence of the heterodyne oscillation, a four-cavity high gain relativistic klystron was developed based on the three-cavity relativistic klystron. PIC particle simulation software is used to study the cold cavity structure, the interaction of beam and wave and the microwave extraction of four-cavity intense current relativistic klystron amplifier from the whole pipe. In order to get the optimal value of output power and efficiency, a low-interaction input cavity is adopted in the structure, and a ladder-like structure drift tube is designed. The suppression of the electron backflow and the hetero-frequency oscillation is suppressed by the intermittent optimization of the output cavity , To achieve the device at high gain under the GW-level high-power microwave output. The simulation shows that the microwave output power of the whole tube reaches 3.05 GW, the efficiency is 22% and the gain is 63 d B (the seed microwave power is 2 kW). The experimental gain of this device is 61.4 dB (seed microwave power 1.38 kW) Power microwave amplification output, microwave pulse width greater than 100 ns.