Abstract
Most efficiency enhancement schemes in free electron lasers are based on adiabatic changes in interaction parameters.1 These changes (i.e., wiggler field period or Intensity changes) are slow enough to permit continuous power extraction from trapped electrons without changing the trapping fraction of the electrons. This fraction is, therefore, a very important parameter in the determination of the overall efficiency of the device. In most conventional amplifier schemes, trapping is determined by the Initial or injection conditions of the electron beam entering the interaction region.
© 1988 Optical Society of America
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