Wiggle plane focusing in linear wigglers

DOI PDF 被引用文献3件
  • E.T. Scharlemann
    Lawrence Livermore Laboratory, University of California, Livermore, California 94550

書誌事項

公開日
1985-09-15
DOI
  • 10.1063/1.335980
公開者
AIP Publishing

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説明

<jats:p>In a free-electron laser with a long, linear wiggler, the external focusing required to keep the electron beam from dispersing can seriously degrade the performance of the laser. The transverse focusing modulates the longitudinal velocity of each electron, periodically and nonadiabatically changing the phase of the electron with respect to the electromagnetic wave. Phase changes of order unity over a betatron period can strongly detrap or debunch electrons and greatly reduce the gain of a linear wiggler amplifier. The modulation of the electron’s longitudinal velocity can be prevented if focusing in the plane of the electron’s wiggle motion is provided by parabolically curved magnet pole faces. The focusing and resonance effects of curved pole faces are analytically calculated and numerically confirmed. Numerical simulations of linear wiggler amplifiers are presented to illustrate the effect of the curved pole faces on amplifier performance.</jats:p>

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