宽间隙反射器相对论返波管同频高阶模式抑制  

Common-frequency mode suppressing of overmoded relativistic backward wave oscillator with wide-gap reflector

作　　者：张晓微[1,2] 李永东[1] 白现臣[2] 梁玉钦 

机构地区：[1]西安交通大学电子物理与器件教育部重点实验室,西安710049 [2]西北核技术研究所高功率微波重点实验室,西安710024

出　　处：《强激光与粒子束》2015年第7期121-126,共6页High Power Laser and Particle Beams

摘　　要：实现输出模式控制和纯化是过模相对论返波管振荡器物理设计的关键。结合数值仿真和粒子模拟,对一种宽间隙反射器过模相对论返波管内的同频高阶模式激励及其抑制进行了研究,结果表明:模式转换和激励是同频高阶模式的直接来源,合理优化慢波结构、反射器和二极管参数,抑制由工作模式向高阶模式的转化效率,调整由二极管区反射回束波互作用区的模式相位,实现了过模相对论返波管的高效率工作和高模式纯度微波输出;所设计的宽间隙反射器过模相对论返波管输出微波功率中TM01模式的比例高于98%,功率转换效率约40%,工作频率为9.87GHz。The mode controlling is a key process for designing an overmoded relativistic backward wave oscillator. Based on the numerical analysis and particle in cell simulation, the common frequency high order mode competition and output mode con trolling of an overmoded RBWO with a wide gap reflector are studied. It indicates that the high order mode is mainly originated from the reciprocal mode conversion and excitation in the RF structures, which can be restrained and controlled by optimizing the sensitive parameters, reducing the conversion factor from fundamental mode to high order one and adjusting the RF phases of dif ferent modes that are reflected back to the beam wave interaction region from the cathode plate. Finally, a beam wave conversion efficiency of 40% and an output TM01 mode purity of 98% are obtained at frequency of 9.87 GHz from the concerned overmoded RBWO.

关 键 词：同频高阶模式 过模相对论返波管振荡器 宽间隙反射器 

分 类 号：TN125[电子电信—物理电子学]