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A concept of a 650 MHz CW magnetron transmitter with fast control in phaseand power, based on two-stage injection-locked CW magnetrons, has been proposedto drive Superconducting Cavities (SC) for intensity-frontier accelerators. Theconcept is based on a theoretical model considering a magnetron as a forcedoscillator and experimentally verified with a 2.5 MW pulsed magnetron. Tofulfill fast control of phase and output power requirements of SC accelerators,both two-stage injection-locked CW magnetrons are combined with a 3-dB hybrid.Fast control in output power is achieved by varying the input phase of one ofthe magnetrons. For output power up to 250 kW we expect the output/input powerratio to be about 35 to 40 dB in CW or quasi-CW mode with long pulse duration.All magnetrons of the transmitter should be based on commercially availablemodels to decrease the cost of the system. An experimental model using 1 kW,CW, S-band, injection-locked magnetrons with a 3-dB hybrid combiner has beendeveloped and built for study. A description of the model, simulations, andexperimental results are presented and discussed in this work.

A High-power 650 MHz CW Magnetron Transmitter for Intensity Frontier Superconducting Accelerators