Efficiency and Spectrum Enhancement in a Tapered Free-Electron Laser Amplifier

Journal Article · Fri Oct 09 00:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.103.154801· OSTI ID:21370746

Wang, X J; Harder, D; Murphy, J B; Qian, H; Shen, Y; Yang, X ^[1]; Freund, H P; Miner, Jr, W H ^[2]

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1. National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 (United States)
2. Science Applications International Corporation, 1710 SAIC Drive, McLean, Virginia 22102 (United States)

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.

• OSTI ID: 21370746
• Journal Information: Physical Review Letters, Vol. 103, Issue 15; Other Information: DOI: 10.1103/PhysRevLett.103.154801; (c) 2009 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLIFIERS
EFFICIENCY
FORECASTING
FREE ELECTRON LASERS
SIMULATION
SPECTRA
WIGGLER MAGNETS
ELECTRONIC EQUIPMENT
EQUIPMENT
LASERS
MAGNETS