P1–11: Investigation of the electrodynamic characteristics for the double-gap multibeam klystron's cavities

The results of the numerical investigation of the electrodynamics features for the various shapes double-gap cavities are presented. The regularity of behavior for fundamental and the first higher-order mode for these cavities are determined. Furthermore the conditions when a ratio of frequencies for fundamental antiphased and higher-order cophased mode becomes multiple were found.