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Ficcadenti, L.

Paper Title Page
TUPEC021 SW/TW Hybrid Photoinjector and its Application to the Coherent THz Radiation 1758
 
  • A. Fukasawa, J.B. Rosenzweig, D. Schiller
    UCLA, Los Angeles, California
  • D. Alesini, L. Ficcadenti, B. Spataro
    INFN/LNF, Frascati (Roma)
  • L. Faillace, L. Palumbo
    Rome University La Sapienza, Roma
 
 

A unique SW/TW hybrid photoinjector are being developed under the collaboration of UCLA, LNF/INFN, and University of Rome. It can produce 240-fs (rms) bunch with 500 pC at 21 MeV. The bunch distribution has a strong spike (54 fs FWHM) and the peak current is over 2kA. As the bunch form factor at 1 THz is 0.43, it can produce coherent radiation at 1 THz. We are considering three types of way to generate it; coherent Cherenkov radiation (CCR), superradiant FEL, and coherent transition/edge radiation (CTR/CER). CCR used hollow dielectric with the outer surface metallic-coated. OOPIC simulation showed 21 MW of the peak power (5 mJ) at 1 THz. For FEL and CTR/CER simulation, QUINDI, which was written at UCLA to solve the Lienard-Wiechert potential, was used to calculate the radiation properties. In the contrast to CCR, their spectra were broad and their pulse lengths were short. They will be useful for fast pumping.

 
TUOARA03 Characterization of the THz Source at SPARC 1296
 
  • E. Chiadroni, F. A. Anelli, M. Bellaveglia, M. Boscolo, M. Castellano, L. Cultrera, G. Di Pirro, M. Ferrario, L. Ficcadenti, D. Filippetto, S. Fioravanti, G. Gatti, E. Pace, R.S. Sorchetti, C. Vaccarezza
    INFN/LNF, Frascati (Roma)
  • A. Bacci, A.R. Rossi
    Istituto Nazionale di Fisica Nucleare, Milano
  • P. Calvani, S. Lupi, D. Nicoletti
    Università di Roma I La Sapienza, Roma
  • L. Catani, B. Marchetti
    INFN-Roma II, Roma
  • A. Cianchi
    Università di Roma II Tor Vergata, Roma
  • O. Limaj
    University of Rome La Sapienza, Rome
  • A. Mostacci
    Rome University La Sapienza, Roma
  • C. Ronsivalle
    ENEA C.R. Frascati, Frascati (Roma)
 
 

The region of the spectrum from 0.3 to 5 THz is of great interest for several experiments in different areas of research. A THz radiation source can be produced at SPARC as coherent transition radiation emitted by either a compressed or longitudinally modulated beam intercepting a metal foil placed at 45° with respect to the beam propagation. Results on the characterization of the THz source at SPARC are described in the paper.

 

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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.

 
THPEA006 Beam Energy Upgrade of the Frascati FEL LINAC with a C-band RF System 3682
 
  • R. Boni, D. Alesini, M. Bellaveglia, G. Di Pirro, M. Ferrario, L. Ficcadenti, A. Gallo, F. Marcellini, E. Pace, B. Spataro, C. Vaccarezza
    INFN/LNF, Frascati (Roma)
  • A. Bacci
    Istituto Nazionale di Fisica Nucleare, Milano
  • A. Mostacci, L. Palumbo, V. Spizzo
    Rome University La Sapienza, Roma
  • C. Ronsivalle
    ENEA C.R. Frascati, Frascati (Roma)
 
 

In the frame of the SPARC-X project, the energy of the Photo-Injector SPARC, in operation at INFN-LNF, will be upgraded from 180 to 250 MeV by replacing a low gradient S-band traveling wave accelerating section with two C-band units, designed and developed at LNF. The new system will consist of a 50 MW klystron, supplied by a pulsed modulator, to feed the high gradient C-band structures through a RF pulse compressor. This paper deals with the design of the full system, the C-band R&D activity and study of the related beam dynamics.