  A concept for a two-stage injection-locked CW magnetron intended to drive
Superconducting Cavities (SC) for intensity-frontier accelerators has been
proposed. The concept considers two magnetrons in which the output power
differs by 15-20 dB and the lower power magnetron being frequency-locked from
an external source locks the higher power magnetron. The injection-locked
two-stage CW magnetron can be used as an RF power source for Fermilab's
Project-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 a
pulsed mode with pulse duration of ~ 8 ms and repetition rate of 10 Hz. The
experimental setup of a two-stage magnetron utilising CW, S-band, 1 kW tubes
operating at pulse duration of 1-10 ms, and the obtained results are presented
and discussed in this paper.
