Research on coaxial dual-mode relativistic Cherenkov oscillator with low magnetic field and high-efficiency
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摘要: 为了提高高功率微波源在低导引磁场下的效率，提出了一种低磁场高效率同轴双模相对论切伦科夫振荡器。该器件工作在同轴准TEM模式与同轴TM01模式下，利用双模工作机制，实现了低磁场下（＜0.4 T）的高效率输出。在粒子模拟中，导引磁场0.35 T时，器件实现了功率3 GW的微波输出、束-波转换效率40%。同时，针对实验中遇到的射频击穿现象，通过增加慢波结构周期数量来提高功率容量，并通过仿真和实验进行验证。最终实验中在0.37 T磁场下，输出微波功率2.85 GW、脉宽57 ns，转换效率34%。在低磁场下获得的实验结果为高功率微波系统小型化的发展提供了强力支撑。
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关键词:
- 高功率微波 /
- 低磁场 /
- 高效率 /
- 相对论切伦科夫振荡器 /
- 双模工作
Abstract: Achieving high-efficiency and high-power operation under low magnetic fields is an important development trend for high-power microwave sources. In order to enhance the efficiency of high-power microwave source under low guiding magnetic fields, a high-efficiency coaxial dual-mode relativistic Cherenkov oscillator (RCO) under a low guiding magnetic field is proposed. The RCO works in both coaxial quasi-TEM mode and TM01 mode and realizes high-efficiency output in low magnetic field (＜0.4 T). In particle-in-cell simulation, when the guiding magnetic field is only 0.35 T, the RCO achieves a microwave output of 3 GW with a beam-wave conversion efficiency of 40%. At the same time, aiming at the RF breakdown phenomenon in the experiment, the power capacity is improved by increasing the number of slow wave structure periods, which is verified by both simulation and experiment. In the experiment, under a magnetic field of 0.37 T, the output power is 2.85 GW with a pulse width of 57 ns and conversion efficiency of 34%. The experimental results obtained under the low magnetic field provide strong support for the development of miniaturization of high-power microwave systems. -
图 1 低磁场高效率双模RCO结构示意图
Figure 1. Schematic of the high-efficiency dual-mode RCO under low magnetic field
图 10 10周期SWS的低磁场高效率双模RCO结构示意图
Figure 10. Schematic of the high-efficiency dual-mode RCO under low magnetic field with 10-period SWS
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