P波段速调管门扭型输出结构的研究

Studies on the Output Structure of a Doorknob Transition for P-Band Klystrons

本文在分析几种现有速调管输出结构的基础上,对P波段速调管门扭型输出结构进行了改进。该结构是一种由同轴波导耦合转换至矩形波导(WR1500)的新型输出结构,在650 MHz频率处驻波比为1.003,带宽5 MHz。本文在对输出窗电磁仿真的基础上进行了热分析和机械应力分析,温升最大点和应力最大点分别位于短路面一侧和窗片、波导壁焊接处。连续波功率1 MW时,最大温升值为46℃,最大应力为117 MPa。该设计具有良好的焊接结构与散热性能,可以满足工程需要。

The output structure of a doorknob transition for P-band klystrons is improved after analyzing the previous structures.The optimized structure of the 1 MW CW 650 MHz klystron is fed to WR1500 waveguide through a coaxial ceramic RF window.The simulation results show that the voltage standing wave ratio of the structure at 650 MHz is 1.003,and the band width is about 5 MHz.With a CW input power of 1 MW,the simulation of temperature distribution and stress distribution on the window shows that the largest temperature change,46℃,locates at the side of the end plate;and the largest stress,117 MPa,locates at the jointing region of the ceramic window plate and the waveguide.This design has good jointing structure and thermal conductance,and it can meet the requirements of the project.