Author: Ferrario, M.
Paper Title Page
MOP080
 Two Color Experiments at SPARC: External and Intra-bunch Seeding  
 
  • D. Alesini, M.P. Anania, M. Bellaveglia, M. Castellano, E. Chiadroni, D. Di Giovenale, G. Di Pirro, M. Ferrario, A. Gallo, G. Gatti, R. Pompili, S. Romeo, V. Shpakov, C. Vaccarezza, F. Villa
    INFN/LNF, Frascati (Roma), Italy
  • M. Artioli
    ENEA-Bologna, Bologna, Italy
  • A. Bacci, A.R. Rossi
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  • M.C. Carpanese, F. Ciocci, G. Dattoli, E. Di Palma, L. Giannessi, A. Petralia, E. Sabia, I.P. Spassovsky
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • A. Cianchi
    INFN-Roma II, Roma, Italy
  • F. Filippi, A. Giribono
    INFN-Roma, Roma, Italy
  • L. Innocenti
    Università di Roma II Tor Vergata, Roma, Italy
  • N.S. Mirian, V. Petrillo
    Universita' degli Studi di Milano & INFN, Milano, Italy
  • A. Mostacci
    Rome University La Sapienza, Roma, Italy
  • J.V. Rau
    ISM-CNR, Rome, Italy
  
  The FEL-SPARC op­er­a­tion with two bunches at dif­fer­ent en­er­gies has been char­ac­ter­ized using dif­fer­ent tools. The ef­fect of the e-beam match­ing on the SASE op­er­a­tion has been ex­plored by con­trol­ling the trans­port with an ad hoc de­vel­oped con­trol sys­tem, al­low­ing ei­ther the trans­port in match­ing con­di­tions and in dif­fer­ent con­fig­u­ra­tions. Since the two bunches have, at the en­trance of the un­du­la­tor, dif­fer­ent phase space char­ac­ter­is­tics we used this ef­fect as a knob to en­hance or sup­press one or the other FEL mode. We in­ves­ti­gated the ef­fect of seed­ing on both fre­quen­cies and ob­served beat­ing waves, fur­ther­more we ob­served ef­fects of in­tra-bunch seed­ing when only one of the modes is seeded.