| Literature DB >> 21561195 |
L Giannessi1, 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.
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.Entities:
Year: 2011 PMID： 21561195 DOI： 10.1103/PhysRevLett.106.144801
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161