Analysis of losses in a rectangular multilayer dielectric-filled tunable accelerating structure

Abstract

Dielectric and induction losses in a rectangular multilayer dielectric-filled accelerating waveguide structure are considered. One ceramic layer of the structure possesses ferroelectric properties, which allow the waveguide frequency spectrum to be controlled by varying the permittivity of this ferroelectric layer. The introduction of an additional dielectric layer with a low permittivity between the ferroelectric layer and a metal shell makes possible a decrease in the waveguide energy losses, while retaining the desired control over the spectrum. The results of calculations of the Q value and the group velocity of the accelerating TM01 mode of the proposed tunable rectangular structure are presented. For an increased Q value, the introduction of an additional layer leads to undesired growth in the group velocity of the accelerating mode.