W波段损耗介质加载回旋返波振荡器中模式竞争的研究  

Research on the mode competition in a w-band lossy ceramic-loaded gyrotron backward-wave oscillator

作　　者：杜朝海[1] 李铮迪[1,2] 薛志浩[1,2] 刘濮鲲[1] 薛谦忠[1] 张世昌[1] 徐寿喜[1] 耿志辉[1] 顾伟[1] 粟亦农[1] 刘高峰[1] 

机构地区：[1]中国科学院高功率微波源与技术重点实验室,中国科学院电子学研究所,北京100190 [2]中国科学院研究生院,北京100190

出　　处：《物理学报》2012年第7期83-88,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61072024,61072026,60971072)资助的课题~~

摘　　要：本文采用自洽非线性理论模型系统研究W波段基波TE_(01)模回旋返波振荡器模式竞争的物理机理.通过采用特殊渐变的非谐振互作用结构和加载损耗介质抑制互作用系统中竞争模式,从而防止系统出现非稳态振荡现象.通过系统优化的互作用结构可以抑制竞争模式,能够稳定工作在TE_(01)模的轴向基模上.计算表明系统输出峰值功率105 kW,-3 dB调谐相对带宽为5.4%.这为发展应用于电子对抗、无损探测、等离子体诊断、材料处理等领域的宽带毫米回旋返波振荡器提供了理论基础,具有借鉴意义.Mode competition induces non-stationary oscillations during the operation of a gyrotron backward-wave oscillator（gyro-BWO）, which severely reduces its tunable bandwidth and output power.Self-consistent nonlinear theory is used to study the modes-competition mechanism of a W-band fundamental TE01 mode gyro-BWO.Tapered non-resonant interaction circuit structure and loading lossy ceramic are employed to suppress the competing modes,as a way of preventing non-stationary oscillation in the circuit.Systematically optimized interaction circuit is capable of suppressing all the competing modes and can stably operate in the fundamental axial mode of the TE_（01） mode.Calculation indicates that a peak power of 105 kW and a—3 dB tunable bandwidth of 5.4%are attainable.This is meaningful and provides a theoretical foundation for developing broadband millimeter gyro-BWOs in the applications of countermeasure system,non-destructive detection,plasma diagnosis,material processing,and so on.

关 键 词：毫米波源 电子回旋脉塞 回旋返波振荡器 模式竞争 

分 类 号：TN752[电子电信—电路与系统]