Self-amplified spontaneous emission free-electron laser with an 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. LabatG. 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

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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. © 2011 American Physical Society.
Original languageEnglish
Article number144801
Pages (from-to)-
JournalPhysical Review Letters
Volume106
Issue number14
DOIs
Publication statusPublished - 5 Apr 2011
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Giannessi, L., Bacci, A., Bellaveglia, M., Briquez, F., Castellano, M., Chiadroni, E., ... Vicario, C. (2011). Self-amplified spontaneous emission free-electron laser with an energy-chirped electron beam and undulator tapering. Physical Review Letters, 106(14), -. [144801]. https://doi.org/10.1103/PhysRevLett.106.144801