Self-Amplified Spontaneous Emission Free-Electron Laser with an Energy-Chirped Electron Beam and Undulator Tapering

Journal Article · Fri Apr 08 04:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.144801· OSTI ID:21550282

Giannessi, L; Ciocci, F; Dattoli, G; Del Franco, M; Petralia, A; Quattromini, M; Ronsivalle, C; Sabia, E; Spassovsky, I; Surrenti, V ^[1]; Bacci, A; Rossi, A R ^[2]; Bellaveglia, M; Castellano, M; Chiadroni, E; Cultrera, L; Filippetto, D; Di Pirro, G; Ferrario, M; Ficcadenti, L ^[2]

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1. ENEA C.R. Frascati, Via E. Fermi, 45 00044 Frascati (Italy)
2. INFN-LNF, Via E. Fermi, 40 00044 Frascati (Italy)

We report the first experimental implementation of a method based on simultaneous use of an energy chirp in the electron beam and a tapered undulator, for the generation of ultrashort pulses in a self-amplified spontaneous emission mode free-electron laser (SASE FEL). The experiment, performed at the SPARC FEL test facility, demonstrates the possibility of compensating the nominally detrimental effect of the chirp by a proper taper of the undulator gaps. An increase of more than 1 order of magnitude in the pulse energy is observed in comparison to the untapered case, accompanied by FEL spectra where the typical SASE spiking is suppressed.

• OSTI ID: 21550282
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 106; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BEAMS
ELECTRON BEAMS
EMISSION
EQUIPMENT
FREE ELECTRON LASERS
LASERS
LEPTON BEAMS
MAGNETS
PARTICLE BEAMS
PULSES
SPECTRA
TEST FACILITIES
WIGGLER MAGNETS