Author: Moreno, M.
Paper Title Page
WEOCI2
 Ultrashort Single Spike Pulse Generation at the SPARC Test Facility  
 
  • D. Filippetto
    LBNL, Berkeley, California, USA
  • A. Bacci, M. Bellaveglia, M. Castellano, E. Chiadroni, L. Cultrera, G. Di Pirro, M. Ferrario, L. Ficcadenti, A. Gallo, G. Gatti, E. Pace, B. Spataro, C. Vaccarezza, C. Vicario
    INFN/LNF, Frascati (Roma), Italy
  • A. Cianchi
    Università di Roma II Tor Vergata, Roma, Italy
  • F. Ciocci, G. Dattoli, M. Del Franco, L. Giannessi, A. Petralia, M. Quattromini, C. Ronsivalle, E. Sabia, I.P. Spassovsky, V. Surrenti
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • F. Frassetto, L. P. Poletto
    LUXOR, Padova, Italy
  • M. Moreno, M. Serluca
    INFN-Roma, Roma, Italy
  • A. Mostacci
    Rome University La Sapienza, Roma, Italy
  • V. Petrillo, A.R. Rossi
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  • J.V. Rau, V. Rossi Albertini
    ISM-CNR, Rome, 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. Longitudinal phase space rotation via velocity bunching is used to generate the energy chirp, which also increases the peak current and the FEL performances. An increase of more than one 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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