Efficiency and spectrum enhancement in a tapered free-electron laser amplifier

Efficiency and spectrum enhancement in a tapered free-electron laser amplifier

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 o...

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Veröffentlicht in:Physical review letters 2009-10, Vol.103 (15), p.154801-154801, Article 154801
Hauptverfasser: Wang, X J, Freund, H P, Harder, D, Miner, Jr, W H, Murphy, J B, Qian, H, Shen, Y, Yang, X
Format: Artikel
Sprache:eng
Schlagworte:
AMPLIFIERS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
EFFICIENCY
ELECTRONIC EQUIPMENT
FORECASTING
FREE ELECTRON LASERS
LASERS
MAGNETS
PARTICLE ACCELERATORS
SIMULATION
SPECTRA
WIGGLER MAGNETS
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Beschreibung
Zusammenfassung: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.103.154801