Phys. Rev. Lett. 103, 154801 (2009) [4 pages]Efficiency and Spectrum Enhancement in a Tapered Free-Electron Laser AmplifierReceived 12 May 2009; published 7 October 2009 We report the first experimental characterization of efficiency and spectrum enhancement in a laser-seeded free-electron laser using a tapered undulator. Output and spectra in the fundamental and third harmonic were measured versus distance for uniform and tapered undulators. With a 4% field taper over 3 m, a 300% (50%) increase in the fundamental (third harmonic) output was observed. A significant improvement in the spectra with the elimination of sidebands was observed using a tapered undulator. The experiment is in good agreement with predictions using the MEDUSA simulation code. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.154801
DOI:
10.1103/PhysRevLett.103.154801
PACS:
41.60.Cr, 52.59.Rz
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