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CW magnetrons, developed for industrial heaters, but driven by aninjection-locking signal were suggested to power Superconducting RF (SRF)cavities due to higher efficiency and lower cost of generated RF power per Wattthan traditionally used RF sources (klystrons, IOTs, solid-state amplifiers).When the magnetrons are intended to feed Room Temperature (RT) cavities, theinjected phase or frequency locking signal may provide required phase orfrequency stability of the accelerating field. However, when the magnetron RFsources are intended to feed high Q-factor SRF cavities, the sources must becontrolled in phase and power in a wide bandwidth to compensate parasitic phaseand amplitude modulations caused by microphonics. In dependence on parametersof magnetron and the injection-locking signal one can choose regime mostsuitable for feeding SRF cavities, enabling magnetron almost coherentoscillation at the wide bandwidth of control. A novel approach consideringmagnetrons as quasi-coherent or coherent RF generators enables choosing thetube parameters and operation most suitable for various SRF accelerators.

On the Phase Grouping Mechanism for a Magnetron Coherent Oscillation