Efficiency of superconducting linear accelerators, especially of those operating in a beam recovery mode, can be limited by the power consumption related to the voltage stabilization in resonators. We consider a concept of a reactive RF control based on a relatively strong conservative coupling between klystron cavity and superconducting resonator. The possibilities of a further reduction of active power are addressed to klystron operation in a linear recovery regime; the related approaches will be discussed, as well.


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