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A method for conditioning electron beams is proposed to enhance gain in resonant electron-beam devices by introducing a correlation between betatron amplitude and energy. This correlation reduces the axial-velocity spread within the beam, and thereby eliminates an often severe constraint on beam emittance. Free-electron-laser performance with a conditioned beam is examined and analysis is performed of a conditioner consisting of a periodic arry of ``FODO'' channels and idealized microwave cavitites excited in the TM₂₁₀ mode. Numerical examples are discussed.
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Sessler et al. (1992) studied this question.