Ka波段二次谐波回旋速调管放大器的输出特性
Output characteristics of a Ka-band, second harmonic three-cavity gyroklystron amplifier
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摘要: 根据谐波回旋速调管放大器的注-波互作用特点，对Ka波段二次谐波三腔回旋速调管放大器的输出腔进行了数值模拟和优化设计，获得了输出腔末端高频波绕射输出孔径和腔体绕射Q值的对应关系。通过PIC粒子模拟，分析了该放大器的频率响应特点等输出特性。结果表明，在35 GHz频率，磁场0.685 T，电子注电压70 kV，电流15 A，横纵速度比为1.45，输入功率1.6 kW时，放大器可以获得超过220 kW的峰值输出功率、约22%的效率和23 dB的增益，3 dB带宽可达到110 MHz。Abstract: The optimal design of the output cavity of a Ka-band second harmonic three-cavity gyroklystron amplifier is finished based on beam-wave interaction characteristics of the amplifier in this paper. The diffraction Q variation with the size of the diffraction output aperture for the RF power at the end of the output cavity is calculated. By PIC simulations, the output characteristics of the amplifier such as the frequency response etc are analyzed. At 35.0 GHz, a peak output power of more than 220 kW with an electronic efficiency of about 23%, and a gain of 23 dB, and a 3 dB bandwidth of 110 MHz (0.3%) is obtained with a 70 kV, 15 A electron beam at a magnetic field of 0.685 T and a beam velocity ratio of 1.45.
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Key words:
- second harmonic /
- gyroklystron amplifier /
- output characteristic /
- pic simulation
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