140 GHz回旋振荡管Denisov辐射器设计

Design of a Denisov launcher of 140 GHz gyrotron

摘要:

根据几何光学和耦合波理论研究高功率回旋振荡管高阶模式在微扰圆波导中的准光传输特性，并编制出带有微扰结构辐射器准光模式变换系统的仿真程序，给出140 GHz回旋振荡管Denisov辐射器的设计方法及结果，分析其内部激励起的各模式的功率分布曲线和波导壁上的电流密度分布，得到扰动长度为60 mm，总长度为136.5 mm的Denisov辐射器结构，输出功率转换效率为99.1%，可满足140 GHz整管参数设计要求。并利用Feko软件对数值计算结果的可行性进行了有效验证，从而为热核聚变用回旋振荡管的研制打下技术基础。

Abstract:

The quasi-optical transmission characteristics of high-order mode of high-power gyrotron oscillator are analyzed based on geometrical optics and coupled-wave theory, and the simulation code of quasi-optical mode converter with perturbation waveguide is compiled. The design method and results of Denisov launcher in 140 GHz gyrotron oscillator are given. The power distribution curves of each mode and the current density distribution on the waveguide wall are analyzed. The launcher structure with disturbance length of 60 mm, total length of 136.5 mm and conversion efficiency of 99.1% are obtained. And the results fulfill the requirement of 140 GHz gyrotron. The software of Feko is adopted to analyze the reliability of the results from numerical calculation, which lays technical foundation for the gyrotron in the application of thermonuclear fusion.