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设计了一支Ka波段二次谐波回旋速调管放大器,并利用基于广义电报方程的时域自洽非线性理论模型,对设计的回旋速调管进行了数值模拟。详细分析了工作电流、横纵速度比和磁场等参数对放大器输出功率、增益和效率的影响,得到了最佳的工作参数。模拟结果表明,在电子注电压70 kV,电流15 A,磁场0.675 T附近,可以获得大于250 kW的输出功率,近26%的效率和440MHz的带宽。
A Ka-band second harmonic gyrator klystron amplifier was designed. The time-domain self-consistent nonlinear model based on generalized telegraph equation was used to simulate the designed klystron. The effects of operating current, speed ratio of longitudinal and longitudinal axes and magnetic field on the output power, gain and efficiency of the amplifier are analyzed in detail. The optimal operating parameters are obtained. The simulation results show that the output power of more than 250 kW, the efficiency of nearly 26% and the bandwidth of 440 MHz can be obtained at an electron injection voltage of 70 kV, a current of 15 A and a magnetic field of 0.675 T.