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在相对论速调管放大器中,由于弱调制电子束通过中间腔会激发较强微波场来实现电子束群聚,在调制腔和输出腔之间增加中间腔可以有效降低注入微波功率,提高放大高增益,然而这种中间腔,尤其是多个中间腔,会导致器件中高次模的激发,影响器件工作模式的正常工作,产生微波脉冲缩短等现象.根据高次模激发的正反馈过程,采取相应措施可以提高其阈值电流,使其大于工作电流,从而避免高次模对工作模式的影响;由此设计了一个电子束参数为5kA,电子能量600kV、高增益S波段相对论速调管,模拟微波输出功率1.1GW,注入微波功率6.8kW,相应增益为1.6×105.
In the relativistic klystron amplifier, because the weakly modulated electron beam passes through the middle cavity and excites the strong microwave field to realize the electron beam grouping, increasing the middle cavity between the modulation cavity and the output cavity can effectively reduce the injected microwave power and increase the amplification. However, the middle cavity, especially the plurality of middle cavities, can lead to the high-order mode excitation in the device and affect the normal operation of the working mode of the device, resulting in the phenomena of shortening of the microwave pulse, etc. According to the positive feedback process of high-order mode excitation, Corresponding measures can increase its threshold current to be larger than the operating current, so as to avoid the influence of high-order mode on the operating mode. A 5 kA electron beam and 600 kV high-gain S-band relativistic klystron were designed. Microwave output power 1.1GW, microwave power injected 6.8kW, the corresponding gain of 1.6 × 105.