Annular electron beam interaction with the corrugated rod

Abstract

We offer to use as an antenna-amplifier the metal rod with radial grooves filled by a dielectric material. The simplest model of such "corrugated rod" with the infinite electron beam (EB) adjacent to the rod is analyzed in the impedance approximation. Expressions for equivalent parameters, the specific inductance and specific capacitance, are used for deriving the dispersion equation in the presence of the EB and calculation of the coupling coefficient.