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Modern CW or pulsed superconducting accelerators of megawatts beams requireefficient RF sources controllable in phase and power. It is desirable to havean individual RF power source with power up to hundreds of kW for eachSuperconductive RF (SRF) cavity. For pulsed accelerators the pulse duration inmillisecond range is required. The efficiency of the traditional RF sources(klystrons, IOTs, solid-state amplifiers) in comparison to magnetrons is lowerand the cost of unit of RF power is significantly higher. Typically, the costof RF sources and their operation is a significant part of the total projectcost and operation. The magnetron-based RF sources with a cost of power unit of1-3 dollars per Watt would significantly reduce the capital and operation costsin comparison with the traditional RF sources. This arouses interest inmagnetron RF sources for use in modern accelerators. A recently developedkinetic model describing the principle of magnetron operation and subsequentexperiments resulted in an innovative technique producing the "stimulated"generation of magnetrons powered below the self-excitation threshold voltage.The magnetron operation in this regime is stable, low noise, controllable inphase and power, and provides higher efficiency than other types of RF powersources. It allows operation in CW and pulse modes (at large duty factor). Forpulsed operation this technique does not require pulse modulators to form RFpulses. It also looks as a promising opportunity to extend magnetron life time.The developed technique, its experimental verification and a brief explanationof the kinetic model substantiating the technique are presented and discussedin this article.

Stimulated Generation of Magnetrons powered below the Self-Excitation Threshold Voltage