Methods of phase and power control in magnetron transmitters for superconducting accelerators

TL;DR

This paper reviews and develops methods for phase and power control in magnetron RF sources for superconducting accelerators, introducing an innovative high-efficiency technique suitable for precise stabilization in accelerator applications.

Contribution

The paper introduces a novel high-efficiency magnetron transmitter technique with wide-range power control for superconducting accelerators, verified with 2.45 GHz magnetrons.

Findings

Resonant injection-locking enables precise phase and power control.

The innovative technique significantly increases magnetron efficiency.

High-efficiency transmitters can reduce costs for accelerator projects.

Abstract

Various methods of phase and power control in magnetron RF sources of superconducting accelerators intended for ADS-class projects were recently developed and studied with conventional 2.45 GHz, 1 kW, CW magnetrons operating in pulsed and CW regimes. Magnetron transmitters excited by a resonant (injection-locking) phasemodulated signal can provide phase and power control with the rates required for precise stabilization of phase and amplitude of the accelerating field in Superconducting RF (SRF) cavities of the intensity-frontier accelerators. An innovative technique that can significantly increase the magnetron transmitter efficiency at the widerange power control required for superconducting accelerators was developed and verified with the 2.45 GHz magnetrons operating in CW and pulsed regimes. High efficiency magnetron transmitters of this type can significantly reduce the capital and operation costs of the ADSclass accelerator projects.