94 GHz TE_(6,2)模式Denisov辐射器的研究

Analysis of a 94 GHz, TE_(6,2) Denisov laucher

准光辐射器是回旋管内置准光模式变换器的重要组成部分.采用几何光学理论分析了圆波导中高阶旋转模式电磁波的准光传输特性,分析了螺旋非规则光滑圆波导中电磁波的传输和模式耦合机理,推导任意扰动的圆波导内模式间的耦合波方程及其相关系数.根据耦合波理论编制准光模式变换器的数值计算程序,分析了Denisov型辐射器内激励起的波导模式的功率分布规律和波导壁上的纵向磁场分布,以及辐射器螺旋切口的辐射场的分布和辐射波束的特征,并采用三维全波仿真软件进行对比模拟.优化了工作频率为94 GHz,TE6,2模式的Denisov型辐射器,其输出功率效率高达98%;加工成实物并内置于回旋振荡内进行热测实验,在回旋管的输出窗处获得了高斯分布的烧斑图.此结果表明测试结果与计算基本一致.

The launcher is an important component of the gyrotron builded-in quasi optical convertor. The propagate char-acteristics of high order modes in volume waveguide are analyzed in this paper based on geometric optical theory. The waveguide coupling equations and the corresponding coupling coefficients of the modes in the perturbation waveguide are derived based on the mode coupling theory. The power distribution in the perturbation waveguide and the field on the wall are analyzed by the numerical calculation code which is written in MATLAB language. The 3D simulation software can be used to verity the numerical result. As an example, a Denisov launcher of 94 GHz, TE6,2 is designed, and the numerical simulation result shows that the conversion efficiency is more than 98%, The hot-test experimental results show that the profile of output field is well consistent with the numerical result.