W波段带状注速调管多间隙腔高频结构及其特性

RF structure and the cavity characteristics of W-band sheet beam klystron

通过对W波段带状注速调管的哑铃型谐振腔特性进行分析,利用三维高频仿真设计软件CST-MSW建立了单间隙、三间隙、五间隙腔的物理模型,详细分析了不同结构尺寸对于高频系统相关冷参数的影响,优化得到了相应的高频结构及其特性参数,以此作为开发的二维注波互作用程序SBK2D快速计算的高频输入参数.同时,为了结合注波互作用系统的热参数三维仿真设计,采用MAGIC-3D对多间隙腔的高频特性及参数进行了仿真计算,得到的结果与CST冷参数设计基本一致,为W波段带状注速调管注波互作用系统的设计提供了重要参数和依据.

The dumb bell resonani cavity characteristics for W-band sheet beam klystron （SBK） are analyzed with one-, three-, and five-gap coupled cavity models by three dimensional high frequency simulation software （CST-MSW）. The dependence of the cold parameters on the configurations of the cavity was analyzed. For the particle in cell （PIC） simu- lation analysis, the optimized cavity frequency combination of eight-cavity WSBK circuit was obtained using 2-D soft- ware SBK2D, which runs with high speed, thereby allowing an efficient investigation of input parameters. To unify the electronic-beam wave interaction system＇s hot parameter design, the calculated results are examined by PIC simulation （MAGIC-3D）, and show good agreement with CST, thereby confirming the design method mentioned above. These re- sults provide key parameters and a good foundation for developing higher performance on RF structure of sheet beam klystron in the future.