Phase and Power Control in the RF Magnetron Power Stations of Superconducting Accelerators

TL;DR

This paper presents a kinetic model and experimental validation for phase and power control in magnetron RF sources, enabling efficient, stable operation suitable for superconducting accelerators.

Contribution

It introduces a simplified kinetic model for magnetron control, verified experimentally, and proposes a high-efficiency RF transmitter scheme for accelerators.

Findings

Stable, low-noise operation below self-excitation threshold

Wide-range power and phase control demonstrated

High efficiency of magnetron RF transmitters for accelerators

Abstract

Phase and power control methods that satisfy the requirements of superconducting accelerators to magnetron RF sources were considered by a simplified kinetic model of a magnetron driven by a resonant injected signal. The model predicting and explaining stable, low noise operation of the tube below the threshold of self-excitation (the Hatrree voltage in free run mode) at a highest efficiency, a wide range of power control and a wide-band phase control was well verified in experiments demonstrating capabilities of the magnetron transmitters for powering of state of the art superconducting accelerators. Descriptions of the kinetic model, the experimental verification and a conceptual scheme of the highly-efficient magnetron RF transmitter for the accelerators are presented and discussed.