带状电子注驱动的准光谐振腔回旋管

Quasi-optical cavity gyrotron with sheet e-beam

摘要:

回旋管作为一种重要的真空电子源，能够在毫米波和太赫兹频段生成高峰值以及高平均功率的电磁辐射，在波谱学、雷达、通信、生物医学等领域具有广泛的应用前景。传统的回旋管将不可避免地面对激烈的模式竞争问题，引入准光谐振腔将有望大大减小模式竞争的激烈程度。本文基于电子回旋脉塞理论，将准光谐振腔及带状电子注进行结合，以期实现更高的输出功率及效率。仿真结果表明，在电子电压为40 kV，背景磁场为8.4 T时，设计的准光回旋管能在220 GHz频点处产生6.1 kW的输出，电子效率达到6.1%且在一段时间内能稳定运行。本文结构将可能为高频段乃至高次谐波工作的回旋管设计提供全新方案，从而进一步用于通信、雷达等领域。

Abstract:

As an important vacuum electron device, the gyrotron has the capability to generate high peak and average powers in the millimeter-wave and terahertz frequency ranges, holding broad prospects of application in fields such as spectroscopy, radar, communication, and biomedical science. However, conventional gyrotrons inevitably face intense mode competition issues, and the introduction of quasi-optical cavity is expected to significantly alleviate the severity of mode competition. In this study, based on the theory of electron gyrotron oscillation, the innovative combination of quasi-optical cavity and sheet electron beam is proposed with the aim of achieving higher output power and efficiency. Simulation results indicate that under conditions of 40 kV electron voltage and an 8.4 T background magnetic field, the designed quasi-optical gyrotron can generate 6.1 kW of output power at a frequency of 220 GHz, with an electron efficiency of 6.1% and stable operation over a certain duration. The proposed structure in this study may provide a novel solution for gyrotron design operating in high-frequency and even higher harmonic regimes, thus furthering its applications in fields such as radar and controlled nuclear fusion.