Abstract
A prebunched electron beam can be exploited to reduce the rise time of a free-electron laser (FEL) oscillator, or to provide the start-up signal for an amplifier. We discuss the dynamical behavior of FEL's operating with prebunched electron beams, and analyze different regimes of operation, from low signal up to saturation. We also include short pulses effects, discussing the modifications occurring in the FEL pulse propagation equation and analyzing the relevant small signal dynamics.
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