Full-wave Analysis of Plasma-Loaded Coaxial Cavity with Wedge-Shaped Corrugations on the Insert

Abstract

High voltages and the existence of scant amount of gas inside gyrotron overmoded cavities leads to the creation of plasma. The presence of magnetic field leads to this plasma being magnetized. In plasma waveguides, space charge modes, cyclotron modes, and EH and HE modes can exist. Inside the gyrotron cavity, magnetized plasma affects the propagation of desired and competing modes. Therefore, for accurate prediction of gyrotron properties, plasma analysis is necessary. For high frequency megawatt class gyrotron, coaxial cavities provide advantages such as reduction in mode competition and reduction of voltage depression. In this paper, full-wave analysis is applied to plasma-filled waveguide with wedge-shaped corrugations on the insert. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.