Coaxial Cavity with Stepped Inner Conductor for Sub-Terahertz Second-Harmonic Gyrotron

Abstract

Coupled-mode formulation for the coaxial cavities is extended to the case of nonzero but small wall impedance. This formulation is applied to the cold analysis of coaxial gyrotron cavity with stepped inner conductor. Such conductor is proposed as a means for selective suppression of the fundamental competing modes in sub-terahertz second-harmonic gyrotrons.