应用几何光学理论分析了高阶过模Denisov辐射器的基本工作原理。以耦合波理论为基础, 给出了高阶过模Denisov辐射器的设计方法。结合3 mm波段边廊模回旋管的具体参数, 研究了3 mm波段工作模式为TE6, 2的Denisov辐射器。采用编制的数值计算程序, 优化得到可靠的最优波导壁扰动几何参量, 据此设计出了紧凑的96.4 GHz工作模式为TE6, 2的Denisov辐射器。经全电磁场仿真验证, 该辐射器壁电流发生了较好的汇聚, 在切割边缘电流幅值降为汇聚中心点的10%, 输出准高斯束能量转换效率为96.51%。

Using the geometrical optics theory, the working principle of high-order overmoded Denisov launcher is analyzed. Based on the mode coupling theory, the design method of the Denisov launcher is put forward. The TE6, 2 Denisov launcher is studied using the concrete parameters of the 3 mm whispering-gallery mode gyrotron. By adopting developed mathematical programme, reliable optimal geometrical parameters of wall distortion are obtained. The 96.4 GHz TE6, 2 Denisov launcher with compact structure is designed, and is verified by an electromagnetic field emulator. Results show that the launcher wall current is well focused, the current of cut edges decreases to 10% of the central focused current, and the power conversion efficiency of the output quasi-Gaussian bundle is 96.51%.