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A concept for a two-stage injection-locked CW magnetron intended to driveSuperconducting Cavities (SC) for intensity-frontier accelerators has beenproposed. The concept considers two magnetrons in which the output powerdiffers by 15-20 dB and the lower power magnetron being frequency-locked froman external source locks the higher power magnetron. The injection-lockedtwo-stage CW magnetron can be used as an RF power source for Fermilab'sProject-X to feed separately each of the 1.3 GHz SC of the 8 GeV pulsed linac.We expect output/locking power ratio of about 30-40 dB assuming operation in apulsed mode with pulse duration of ~ 8 ms and repetition rate of 10 Hz. Theexperimental setup of a two-stage magnetron utilising CW, S-band, 1 kW tubesoperating at pulse duration of 1-10 ms, and the obtained results are presentedand discussed in this paper.

A Two-stage injection-locked magnetron for accelerators with superconducting cavities