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 energy-chirped electron beam and undulator tapering / L. Giannessi, A. Bacci, M. Bellaveglia, F. Briquez, M. Castellano, E. Chiadroni, A. Cianchi, F. Ciocci, M.E. Couprie, L. Cultrera, G. Dattoli, D. Filippetto, M. Del Franco, G. Di Pirro, M. Ferrario, L. Ficcadenti, F. Frassetto, A. Gallo, G. Gatti, M. Labat, G. Marcus, M. Moreno, A. Mostacci, E. Pace, A. Petralia, V. Petrillo, L. Poletto, M. Quattromini, J.V. Rau, C. Ronsivalle, J. Rosenzweig, A.R. Rossi, V. Rossi Albertini, E. Sabia, M. Serluca, S. Spampinati, I. Spassovsky, B. Spataro, V. Surrenti, C. Vaccarezza, C. Vicario. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 106:14(2011 Apr 08), pp. 144801.144801.1-144801.144801.4.
Self-amplified spontaneous emission free-electron laser with energy-chirped electron beam and undulator tapering
V. Petrillo;
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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