基于大回旋电子注的高次谐波回旋行波管

High-order harmonic Gyrotron Traveling Wave Tubes with large orbit electron beams

摘要:

回旋行波管兼具高功率、宽频带特性，在毫米波高分辨成像雷达、电子对抗等重要军事领域具有广泛的应用前景。基于大回旋电子注的回旋行波放大器可工作于高次谐波状态，大大降低了工作磁场，甚至可实现无超导工作，提高了回旋行波管使用的灵活性和机动性。本文优化设计了一支Ka波段二次谐波大回旋行波管，采用具有介质加载的纵向开槽互作用高频结构有效抑制返波振荡，提高了器件工作的稳定性。利用三维粒子仿真，对大回旋行波管注-波互作用过程进行了模拟。结果表明，在电子注电压为70 kV，电流为6.5 A时，磁场可降低至0.642 T，输出功率达到106.5 kW，带宽为2.10 GHz，最大增益为35 dB。

Abstract:

Gyrotron Traveling Wave Tubes(Gyrotron-TWT) have both high power and broadband characteristics, which have broad application prospects in important military fields such as millimeter wave detection and imaging radar, electronic countermeasures, etc. The gyrotron traveling wave amplifier with large orbit electron beams can operate in high-order harmonic state, greatly reducing the operating magnetic field and even achieving superconducting free operation. It can improve the flexibility and maneuverability of Gyrotron-TWT. This paper optimizes and designs a Ka band second harmonic Gyrotron-TWT with large orbit electron beams, which adopts a longitudinal slot interaction high-frequency structure with dielectric loading to effectively suppress backwave oscillation and improve the stability of device operation. The process of beam wave interaction in the Gyrotron-TWT was simulated by using three-dimensional particle simulation software. The results show that at the condition of the electron beam voltage of 70 kV, the current of 6.5 A, the magnetic field can be reduced to 0.642 T, the corresponding output power can reach 106.5 kW, the bandwidth is 2.1 GHz, and the maximum gain is 35 dB.