边加载径向三腔渡越时间振荡器设计
Design facts in side appending radial three-cavity transit time oscillator
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摘要: 提出了一种边加载结构的径向三腔渡越时间振荡器。通过1维单粒子理论研究了直流渡越角和电压调制系数对束-波互作用效率的影响，并进行了2.5维数值模拟验证。数值模拟研究表明:该器件具有低阻抗、高效率、输出微波频率单一稳定等特点。在400 kV，60 kA无外加引导磁场的条件下，获得了平均功率为8 GW，频率为3.9 GHz的微波输出，效率达33.3%，阻抗仅为6.7 Ω。Abstract: A side appending three-cavity transmit time oscillator is proposed. Through 1-D single particle theory, the effects of the direct current transit angle and the volt modulating coefficient on the microwave power conversion efficiency are analysed. Numerical simulation is done to verify the theoretical analysis results. Numerical simulation indicates that the foilless oscillator can output an average power of 8 GW at 3.9 GHz when excited by a 400 keV, 60 kA radial electron beam, with an impedance of 6.7 Ω.
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