高阶体模准光模式激励器的设计与实验

Design and experiments of a high-order body mode generator using quasi-optical technology

基于开放式谐振腔及准光学模式变换理论,设计并实现了一种应用于回旋管振荡器冷测的高阶模式激励器。以140 GHz、TE_(28,8)模工作为例,通过计算机编程控制三维移动测量平台和网络分析仪完成了相应的实验测量。当模拟仿真获得在谐振腔激起频率为140.179 GHz、Q值为855、输出场分布与TE_(28,8)模的相关性为90.9%时,对应设计构建模式激励器完成的冷测结果频率为140.155 GHz、Q值为876、横向电场明显具有TE_(28,8)的特征,为回旋管振荡器研究和设计过程检验提供了一个有效的实验平台。

Based on the theory of open resonant cavity and quasi-optical mode conversion,a high-order quasi-optical mode generator was designed and manufactured for the cold measurement of the gyrotron oscillator.For the high-order mode generator working at 140 GHz and TE_(28,8) mode,the corresponding experimental measurements were completed using the three-dimensional mobile measurement platform and the network analyzer which were controlled by computer programming.The results show that,when the simulation results related to the resonant frequency,Q factor,and the correlation of the electric field distribution with the TE_(28,8) mode in the cavity are respectively 140.179 GHz,855,and 90.9%,the corresponding cold-tested ones for resonant frequency and Q factor are respectively 140.155 GHz and 876,and the transverse electric field distribution tested is very similar to that of the TE_(28,8) mode.It indicates that the quasi-optical mode generator designed in this paper can provide an effective experimental platform for the research and design process verification of the high-order body mode gyrotron oscillator.