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 selfamplified 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.

Giannessi, L., Bacci, A., Bellaveglia, M., Briquez, F., Castellano, M., Chiadroni, E., et al. (2011). Self-Amplified Spontaneous Emission Free-Electron Laser with an Energy-Chirped Electron Beam and Undulator Tapering. PHYSICAL REVIEW LETTERS, 106(14), 144801 [10.1103/PhysRevLett.106.144801].

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

CIANCHI, ALESSANDRO;
2011-04-05

Abstract

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 selfamplified 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.
5-apr-2011
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01 - FISICA SPERIMENTALE
English
Con Impact Factor ISI
free electron laser; SASE;
Giannessi, L., Bacci, A., Bellaveglia, M., Briquez, F., Castellano, M., Chiadroni, E., et al. (2011). Self-Amplified Spontaneous Emission Free-Electron Laser with an Energy-Chirped Electron Beam and Undulator Tapering. PHYSICAL REVIEW LETTERS, 106(14), 144801 [10.1103/PhysRevLett.106.144801].
Giannessi, L; Bacci, A; Bellaveglia, M; Briquez, F; Castellano, M; Chiadroni, E; Cianchi, A; Ciocci, F; Couprie, M; Cultrera, L; Dattoli, G; Filippetto, D; Del Franco, M; Di Pirro, G; Ferrario, M; Ficcadenti, L; Frassetto, F; Gallo, A; Gatti, G; Labat, M; Marcus, G; Moreno, M; Mostacci, A; Pace, E; Petralia, A; Petrillo, V; Poletto, L; Quattromini, M; Rau, J; Ronsivalle, C; Rosenzweig, J; Rossi, A; Rossi Albertini, V; Sabia, E; Serluca, M; Spampinati, S; Spassovsky, I; Spataro, B; Surrenti, V; Vaccarezza, C; Vicario, C
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/15954
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