Phase Grouping of Larmor Electrons By a Synchronous Wave In Controlled Magnetrons

TL;DR

This paper presents a simplified analytical model for magnetrons that predicts stable, efficient, and low-noise operation through phase grouping of Larmor electrons influenced by a synchronous wave, supported by experimental validation.

Contribution

The paper introduces a new charge drift-based analytical model that explains stable coherent generation in magnetrons with injected signals, enhancing understanding of their stability and efficiency.

Findings

Model predicts stable operation above and below self-excitation threshold.

High efficiency and low noise achieved over 10 dB power control range.

Experimental validation with 2.45 GHz, 1 kW magnetrons supports the model.

Abstract

A simplified analytical model based on the charge drift approximation has been developed. It considers the resonant interaction of the synchronous wave with the flow of Larmor electrons in a magnetron. The model predicts stable coherent generation of the tube above and below the threshold of self-excitation. This occurs if the magnetron is driven by a sufficient resonant injected signal (up to -10 dB). The model substantiates precise stability, high efficiency and low noise at the range of the magnetron power control over 10 dB by variation of the magnetron current. The model and the verifying experiments with 2.45 GHz, 1 kW magnetrons are discussed.