  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.
