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本文根据四腔强流相对论速调管设计过程中出现的高次模振荡现象,采用电磁场软件模拟,分析了这种振荡的产生原因,给出抑制这种高次模振荡的方法.利用二维和三维模拟软件,研究了谐振腔谐振频率、谐振腔Q值、漂移管长度、特性阻抗等参数的变化对高次模振荡的影响,模拟上验证了高次模振荡抑制方法的有效性,并在输出端模拟获得了功率2.13 GW、效率26%、增益60 dB的输出微波,实现了2D,3D中高次模振荡的有效抑制.最终在实验中获得了功率1.9 GW、效率24%、增益61 dB的输出微波.
According to the phenomenon of high-order mode oscillation in the process of design of four-cavity intense current relativistic klystron, the cause of this oscillation is analyzed by electromagnetic field software simulation and the method of suppressing this high order mode oscillation is given. And three-dimensional simulation software were used to study the influence of resonant cavity resonant frequency, cavity Q value, drift tube length and characteristic impedance on the oscillation of high order modes. The validity of the high order mode oscillation suppression method was verified by simulation At the output, an output microwave with power of 2.13 GW, efficiency of 26% and gain of 60 dB was simulated, and the effective suppression of high order mode oscillation in 2D and 3D was achieved.At last, 1.9 GW of power, 24% efficiency and 61% dB output microwave.