Simulations for a low-perveance high-quality beam matching of a high efficiency Ka-band klystron

TL;DR

This paper presents analytic and numeric simulations for designing high-quality electron guns and beam matching techniques to optimize the efficiency of 36 GHz Ka-band klystrons producing 20 MW power.

Contribution

It introduces a novel set of electron gun designs and beam focusing methods tailored for high-power Ka-band klystrons, enhancing efficiency and beam quality.

Findings

Optimized electron gun configurations for high beam quality.

Effective beam focusing channels for 36 GHz klystrons.

Achieved target RF power output with improved efficiency.

Abstract

Self consistent analytic and numeric design for a set of electron guns with a high beams quality to be used in high power Ka-band klystrons are presented in this paper. The set of electron guns can be used in the high power Ka-band klystrons in order to feed linear accelerating structures at 36 GHz with an estimated 20 MW input power by achieving an effective accelerating electric field in the (100-150) MV/m range. In the framework of the Compact Light XLS project, a short Ka-band linearizer by working at 36 GHz able for providing an integrated voltage of at least 15 MV is proposed for bunch-phase linearization. In order to optimize the Ka-band klystrons efficiency for achieving 20 MW RF output power, different electron guns and beam focusing channel designs are examined and discussed in this paper.