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Giannessi, L.

Paper Title Page
TUPEC028 Microbunching Instability Effect Studies and Laser Heater Optimization for the SPARX FEL Accelerator 1779
 
  • C. Vaccarezza, E. Chiadroni, M. Ferrario
    INFN/LNF, Frascati (Roma)
  • G. Dattoli, L. Giannessi, M. Quattromini, C. Ronsivalle
    ENEA C.R. Frascati, Frascati (Roma)
  • M. Migliorati
    Rome University La Sapienza, Roma
  • M. Venturini
    LBNL, Berkeley, California
 
 

The effects of microbunching instability for the SPARX accelerator have been analyzed by means of different numerical simulation codes and analytical approach. The laser heater counteracting action has been also addressed in order to optimize the parameters of the compression system, either hybrid RF plus magnetic chicane or only magnetic, and possibly enhance the FEL performance.

 
TUPE082 Advanced Beam Dynamics Experiments with the SPARC High Brightness Photoinjector 2311
 
  • M. Ferrario, D. Alesini, F. A. Anelli, M. Bellaveglia, M. Boscolo, L. Cacciotti, M. Castellano, E. Chiadroni, L. Cultrera, G. Di Pirro, L. Ficcadenti, D. Filippetto, S. Fioravanti, A. Gallo, G. Gatti, A. Mostacci, E. Pace, R.S. Sorchetti, C. Vaccarezza
    INFN/LNF, Frascati (Roma)
  • A. Bacci, V. Petrillo, A.R. Rossi, L. Serafini
    Istituto Nazionale di Fisica Nucleare, Milano
  • A. Cianchi, B. Marchetti
    INFN-Roma II, Roma
  • L. Giannessi, A. Petralia, C. Ronsivalle
    ENEA C.R. Frascati, Frascati (Roma)
  • O. Limaj
    University of Rome La Sapienza, Rome
  • M. Moreno, M. Serluca
    INFN-Roma, Roma
  • J.B. Rosenzweig
    UCLA, Los Angeles, California
  • H. Tomizawa
    JASRI/SPring-8, Hyogo-ken
  • C. Vicario
    PSI, Villigen
 
 

The primary goal of the SPARC project is the commissioning of the SASE FEL operating at 500 nm driven by a 150-200 MeV high brightness photoinjector. Additional experiments are foreseen also in the HHG Seeded configuration at 266, 160 and 114 nm. A second beam line hosting a THz source has been recently commissioned. The recent successful operation of the SPARC injector in the Velocity Bunching (VB) mode has opened new perspectives to conduct advanced beam dynamics experiments with ultra-short electron pulses able to extend the THz spectrum and to drive the FEL in the SASE Single Spike mode. Moreover a new technique called Laser Comb, able to generate a train of short pulses with high repetition rate, as the one required to drive coherent plasma wake field excitation, has been tested in the VB configuration. The energy/density modulation produced by an infrared laser pulse interacting with the electron beam near the cathode has been also investigated. In this paper we report the experimental results obtained so far and the comparison with simulations.