W波段带状注速调管多间隙腔高频结构及其特性

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SBK.2D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.

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

The dumb bell resonant cavities 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 effects, which are caused by different dimensional sizes, to the cold parameters are analyzed. For the particle in cell (PIC) simulation analysis, we firstly make a research of the optimum cavity frequency combination of eight-cavity WSBK circuit using 2-D software SBK2D, which runs quickly, thereby allowing an efficient investigation of input parameters. To unify the electronic-beam wave interaction system's hot parameter design, the calculation results are examined by PIC simulation (MAGIC-3D),which show good agreement with CST, thereby confirming the design method which this article gave. These results provide key parameters and a good foundation for developing higher performance on RF structure of sheet beam klystron in the future.