Research and optimization of a new design of output window for high power microwave tubes

Anatoly Galdetskiy,Alexander Savin,P Yermolov

doi:10.1051/itmconf/20193002004

Abstract

A design of an output window integrated with an output resonator of the high-power klystron is proposed. The results of a theoretical study of the frequency response of an integrated window are presented. Calculation of the electric field in critical areas of the optimized design showed that the losses in the vacuum-tight dielectric are much lower, and the tangential components of the field on its surface, which are the source of breakdowns, are lower or comparable with similar parameters of traditional pillbox windows.

Highlights

One of the key problems in the development of S-band klystrons with pulse power Pimp = 5–150 MW is the design of vacuum-tight windows, since in order to prevent microwave breakdown it is necessary to ensure low values of the electric field in the window cavity, on the dielectric surface and in the brazing area
To increase reliability of the window at operation at large powers in klystron, we propose embedding the vacuum-tight septum to the output resonator and positioning it in a region with a minimum electric field (Fig. 1)
Inductive coupling slots are located in a common narrow wall and summ up the power coming from each slot to the output of a encircling waveguide and provide the required loaded Q-factor of the output cavity

Summary

Introduction

To increase reliability of the window at operation at large powers in klystron, we propose embedding the vacuum-tight septum to the output resonator and positioning it in a region with a minimum electric field (Fig. 1). In this way, additional perturbation by the window in the output waveguide is absorbed by coupling slots discontinuity and the probability of microwave breakdown and overheating of the vacuum-tight septum due to dielectric losses is reduced. The work is devoted to the study and optimization of electrodynamic parameters of a new type of window, integrated with the output resonator and designed to work with increased power level

Object and methods of research

Results of reseach

Conclusion