Observation of Anomalously Large Spectral Bandwidth in a High-Gain Self-Amplified Spontaneous Emission Free-Electron Laser

Journal Article · Fri Jul 29 00:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.054801· OSTI ID:20699260

Andonian, G; Murokh, A; Rosenzweig, J B; Agustsson, R; Frigola, P; Pellegrini, C; Reiche, S; Travish, G ^[1]; Babzien, M; Ben-Zvi, I; Huang, J Y; Yakimenko, V ^[2]; Palumbo, L; Vicario, C ^[3]

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1. Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095 (United States)
2. Accelerator Test Facility, Brookhaven National Laboratory, Upton, New York 11973 (United States)
3. Universita degli Studi di Roma 'La Sapienza', Via Antonia Scarpa 14, Rome, 00161 (Italy)

Observation of ultrawide bandwidth, up to 15% full-width, high-gain operation of a self-amplified spontaneous emission free-election laser (SASE FEL) is reported. This type of lasing is obtained with a strongly chirped beam ({delta}E/E{approx}1.7%) emitted from the accelerator. Because of nonlinear pulse compression during transport, a short, high current bunch with strong mismatch errors is injected into the undulator, giving high FEL gain. Start-to-end simulations reproduce key features of the measurements and provide insight into mechanisms, such as angular spread in emitted photon and electron trajectory distributions, which yield novel features in the radiation spectrum.

• OSTI ID: 20699260
• Journal Information: Physical Review Letters, Vol. 95, Issue 5; Other Information: DOI: 10.1103/PhysRevLett.95.054801; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATORS
ELECTRONS
ERRORS
FREE ELECTRON LASERS
MODULATION
NONLINEAR PROBLEMS
PHOTONS
PULSES
SIMULATION
SUPERRADIANCE
TRAJECTORIES