140GHz TE_(22,6) Vlasov准光模式变换器的设计仿真  

Simulation Design of a 140 GHz TE_(22,6) Vlasov Quasi-optical Mode Converter

作　　者：田伯阳 刘本田[1] 李志良[1] 冯进军[1] 闫铁昌[1] 

机构地区：[1]北京真空电子技术研究所微波电真空器件国家级重点实验室,北京100015

出　　处：《真空电子技术》2016年第3期26-31,共6页Vacuum Electronics

基　　金：国家科技部磁约束核聚变能专项(项目编号No.2013GB110003)

摘　　要：用于ITER项目等离子体加热的兆瓦级回旋管振荡管,准光模式变换器是回旋管的关键部件。不同于传统的波导模式变换器,准光模式变换器具有诸多优势。避免反射波干扰互作用段、实现了横向输出高斯波束便于传输利用,可采用降压收集提高整管效率。基于几何光学理论,分析设计了140GHz TE_(22,6) Vlasov准光模式变换器的辐射器和镜面系统,计算分析了各镜面和输出窗的场分布,该系统的转换效率是77.4%,输出波束的高斯纯度为81.6%。Quasi-optical （QO） mode converter is a key part of a megawatt gyrotron oscillator for plasma heating application in International Thermonuclear Experimental Reactor （ITER） projects. Different from traditional waveguide mode converter, QO mode converter has many advantages. It can avoid the interference from reflection wave, realize transverse output, produce Gauss beam to facilitate the transmission and use multistage depressed collector to improve efficiency. Based on geometrical optics theory, launcher and mirror system of a 140 GHz TE22.6 Vlasov QO mode converter are analyzed and designed, output mirrors and field distribution of the window are calculated. The conversion efficiency of the system is 77.4%, and the Gaussian purity of output beam is 81.6%.

关 键 词：回旋管 高斯波束 准光技术 模式变换器 ITER 

分 类 号：TN105[电子电信—物理电子学]