一种超低电压宽带调谐太赫兹回旋管互作用结构  

An Interaction Circuit for Ultra-Low-Voltage Broadband Terahertz Gyrotron

作　　者：罗里 黄明光[2] 杜朝海[3] 刘濮鲲[3] LUO Li;HUANG Ming-guang;DU Chao-hai;LIU Pu-kun(School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Electronics,Chinese Academy of Sciences;School of Electronics Engineering and Computer Science,Peking University,Beijing 100871,China)

机构地区：[1]中国科学院大学电子电气与通信工程学院,北京100049 [2]中国科学院电子学研究所,北京100190 [3]北京大学信息科学技术学院,北京100871

出　　处：《微波学报》2018年第5期8-12,30,共6页Journal of Microwaves

基　　金：国家自然科学基金(61531002,61471007,61522101);北京市NOVA项目(Z161100004916057)

摘　　要：低电压频率可调太赫兹回旋管在生物医学和波谱学等领域具有重要应用。文章分析了超低电压（〈1 k V）下采用传统开放腔互作用电路的330 GHz回旋管输出功率和频率调谐特性,探讨了超低电压下由于电子相对论效应减弱而导致的回旋管中电子注-波互作用耦合强度降低的问题。在此基础上,针对330 GHz超低电压回旋管提出了一种改进的互作用电路结构,其下倾式尾端结构有助于增大反向波幅度,提高弱相对论电子注与电磁波之间的耦合强度,从而提高回旋管的输出效率及频率调谐带宽。非线性模拟结果表明,在低至0.3 k V的超低电压下,采用此种互作用电路结构仍可获得大于1 W的连续波输出功率及22 GHz的连续调谐带宽,峰值输出效率大于7%。The low-voltage frequency-tunable terahertz gyrotron is widely used in the biomedical and spectroscopy fields. In this paper,the output power and frequency tunability of a 330 GHz ultra-low-voltage gyrotron with the traditional open resonance cavity are analyzed,meanwhile the weak beam-wave coupling problem due to the mildly relativistic electron beams in the low-voltage gyrotron is discussed. Based on this,an improved interaction circuit for a 330 GHz ultra-low-voltage gyrotron is proposed. The down-taper section on the downstream of cavity can help strengthen the amplitude of the backward wave in the cavity,and enhance the coupling between the mildly relativistic electron beam and the electron magnetic wave.Thus,the output power and frequency tuning range of the low-voltage gyrotron can be obviously increased. The simulation results indicate that even with 0.3 k V beam voltage,the output power of the gyrotron with the optimal circuit still greater than1 W in the continuous frequency tuning range of 22 GHz,and the peak efficiency is greater than 7%.

关 键 词：太赫兹 超低电压 回旋管 宽带调谐 互作用结构 

分 类 号：TN12[电子电信—物理电子学]