TE22,6模式—高斯波的准光模式转换器设计

Optimized design of quasi-optical mode converter for TE22,6-mode to Gaussian beam

摘要:

准光模式转换器是高功率毫米波回旋管的重要组成部份，能够实现电磁波与电子注的分离、隔离波的反射，并实现回旋管的高斯波束输出。基于耦合波理论，分析设计出用于频率140 GHz、TE22.6模式回旋管的Denisov辐射器；基于几何光学理论，设计出准光反射镜面系统，并采用Feko软件进行优化。计算结果表明，所设计的准光模式转换器系统的转换效率约为97.3%，波束的高斯含量约为93.3%，达到了回旋管的应用需求。

Abstract:

The quasi-optical mode converter is the main part of the high-power millimeter wave gyrotron. The converter can separate the electron beam and electromagnetic wave，reduce the reflecting microwave into the high-frequency cavity，and realize the output of transversal Gaussian beam. The Denisov launcher for 140 GHz，TE22.6-mode gyrotron has been analyzed and designed according to the mode coupling theory. And the reflecting mirrors have been designed with the geometrical optics theory and optimized by Feko simulation. According to the calculation results，the conversion efficiency of electromagnetic energy is 97.3% and the Gaussian content of output wave-beam is 93.3% for the quasi-optical mode converter，which can meet the requirements of the gyrotrons.