Abstract
We propose a high-efficiency regime of a “multi-stage” trapping in FELs. This FEL scheme use strongly tapered flying RF undulator sections to be fed by short (nanosecond) high-power RF pulses produced by already existing BWOs. In this regime, phase locking of the RF sources is not necessary. Moreover, this regime provides an effective amplification of a multi-frequency wave signal in the SASE regime used in typical short-wavelength FELs. In this work, we describe the proposed multi-stage regime, as well as profiled microwave system designed for the realization of tapered rf undulators.
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