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Vaccarezza, C.

Paper Title Page
TUBAU04 Generation of Sub-fsec, High Brightness Electron Beams for Single Spike SASE FEL Operation 214
 
  • J. B. Rosenzweig, M. P. Dunning, L. Faillace, A. Fukasawa, E. Hemsing, G. Marcus, A. Marinelli, P. Musumeci, B. D. O'Shea, C. Pellegrini, S. Reiche
    UCLA, Los Angeles, California
  • M. Boscolo, M. Ferrario, L. Palumbo, B. Spataro, C. Vaccarezza
    INFN/LNF, Frascati (Roma)
  • L. Giannessi, C. Ronsivalle
    ENEA C. R. Frascati, Frascati (Roma)
  • V. Petrillo
    Istituto Nazionale di Fisica Nucleare, Milano
  
  We present here the theory and computational modeling of beams in a new regime, where <1 pC beams are strongly velocity bunched at low energy, and then compressed at several GeV to less than a fsec. This regime of operation produces beams with thermally dominated transverse emittance, and mitigates many problems associated with the nC-level operation. These problems include CSR induced instability and intra-undulator wakes. The resulting beams have extremely high brightness, enabling very high gain, efficiency, and single spike operation. We present the scaling laws governing this regime, and the detailed example of the proposed SPARX FEL design.  
TUPPH012 Single spike experiments with the SPARC SASE FEL 258
 
  • M. Ferrario, M. Boscolo, L. Palumbo, C. Vaccarezza
    INFN/LNF, Frascati (Roma)
  • G. Andonian, E. Hemsing, G. Marcus, S. Reiche, J. B. Rosenzweig
    UCLA, Los Angeles, California
  • A. Bacci, I. Boscolo, F. Castelli, S. Cialdi, V. Petrillo, L. Serafini
    Istituto Nazionale di Fisica Nucleare, Milano
  • L. Giannessi, C. Ronsivalle
    ENEA C. R. Frascati, Frascati (Roma)
  • M. Serluca
    INFN-Roma, Roma
  
  We describe in this paper a possible experiment with the existing SPARC photoinjector to test the generation of sub-picosecond high brightness electron bunches able to produce single spike radiation pulses at 500 nm with the SPARC self-amplified spontaneous emission free-electron laser (SASE-FEL). The main purpose of the experiment will be the production of short electron bunches as long as few SASE cooperation lengths and to validate scaling laws to foresee operation at shorter wavelength in the future operation with SPARX. We present in this paper start to end simulations of the expected FEL performance and discuss the layout of the machine, including the diagnostics to measure the FEL pulse length and other aspects of FEL performance. The experience gained from this experiment, will help in the configuration of the VUV and X-ray FEL SPARX to obtain FEL pulses below 10 fs.  
TUPPH048 Recent Results of the SPARC Project 359
 
  • M. Ferrario, D. Alesini, M. Bellaveglia, R. Boni, M. Boscolo, M. Castellano, E. Chiadroni, A. Clozza, L. Cultrera, G. Di Pirro, A. Drago, A. Esposito, L. Ficcadenti, D. Filippetto, V. Fusco, A. Gallo, G. Gatti, A. Ghigo, A. Marcelli, B. Marchetti, M. Migliorati, A. Mostacci, E. Pace, L. Palumbo, L. Pellegrino, R. Ricci, U. Rotundo, C. Sanelli, F. Sgamma, B. Spataro, F. Tazzioli, S. Tomassini, C. Vaccarezza, M. Vescovi, C. Vicario
    INFN/LNF, Frascati (Roma)
  • A. Bacci, I. Boscolo, F. Broggi, F. Castelli, S. Cialdi, C. De Martinis, D. Giove, C. Maroli, V. Petrillo, A. R. Rossi, L. Serafini
    Istituto Nazionale di Fisica Nucleare, Milano
  • M. Bougeard, B. Carré, D. Garzella, M. Labat, G. Lambert, H. Merdji, P. Salieres, O. Tchebakoff
    CEA, Gif-sur-Yvette
  • L. Catani
    INFN-Roma II, Roma
  • A. Cianchi
    Università di Roma II Tor Vergata, Roma
  • F. Ciocci, G. Dattoli, M. Del Franco, A. Dipace, A. Doria, G. P. Gallerano, L. Giannessi, E. Giovenale, G. L. Orlandi, S. Pagnutti, A. Petralia, M. Quattromini, C. Ronsivalle, E. Sabia, I. P. Spassovsky, V. Surrenti
    ENEA C. R. Frascati, Frascati (Roma)
  • M.-E. Couprie
    SOLEIL, Gif-sur-Yvette
  • A. Marinelli, J. B. Rosenzweig
    UCLA, Los Angeles, California
  • M. Mattioli, M. Petrarca, M. Serluca
    INFN-Roma, Roma
  • J. Rossbach
    Uni HH, Hamburg
  
  The SPARC project foresees the realization of a high brightness photo-injector to produce a 150-200 MeV electron beam to drive 500 nm FEL experiments in various configurations. The SPARC photoinjector is also the test facility for the recently approved VUV FEL project named SPARX. The second stage of the commissioning, that is currently underway, foresees a detailed analysis of the beam matching with the linac in order to confirm the theoretically prediction of emittance compensation based on the “invariant envelope” matching , the demonstration of the “velocity bunching” technique in the linac and the characterisation of the spontaneous emission radiation in the SPARC undulators. In this paper we report the experimental results obtained so far.