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Synchrotron-betatron resonances in free-electron lasers

W.M. Fawley, D. Prosnitz, E. T. Scharlemann

Abstract

The coupling between betatron and synchrotron oscillations in a tapered wiggler free-electron laser (FEL) is investigated analytically and numerically. The resonance between the oscillations, first investigated by Rosenbluth, is shown to be important only for a very limited range of parameters. In general, the resonance is not a serious detrapping mechanism for high-power FEL amplifiers.

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Key concepts: Betatron, Wiggler, Physics, Free-electron laser, Synchrotron, Atomic physics, Electron, Resonance (particle physics)