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.

Self-Amplified Spontaneous Emission Free-Electron Laser with an Energy-Chirped Electron Beam and Undulator Tapering / Giannessi, L.; Bacci, A.; Bellaveglia, M.; Briquez, F.; Castellano, M.; Chiadroni, E.; Cianchi, A.; Ciocci, F.; Couprie, M. E.; 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, Andrea; Pace, E.; Petralia, A.; Petrillo, V.; Poletto, L.; Quattromini, M.; Rau, J. V.; Ronsivalle, C.; Rosenzweig, J.; Rossi, A. R.; Albertini, V. R.; Sabia, E.; Serluca, M.; Spampinati, S.; Spassovsky, I.; Spataro, B.; Surrenti, V.; Vaccarezza, C.; Vicario, C.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 106:14(2011), pp. 144801-1-144801-4. [10.1103/physrevlett.106.144801]

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

E. Chiadroni;L. Ficcadenti;MOSTACCI, Andrea;
2011

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 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/378387
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