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Ferrario, M.

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TUPEC027 Microbunching and RF Compression 1776
 
  • M. Migliorati
    Rome University La Sapienza, Roma
  • M. Ferrario, C. Vaccarezza
    INFN/LNF, Frascati (Roma)
  • C. Ronsivalle
    ENEA C.R. Frascati, Frascati (Roma)
  • M. Venturini
    LBNL, Berkeley, California
 
 

Velocity bunching (or RF compression) represents a promising technique complementary to magnetic compression to achieve the high peak current required in the linac drivers for FELs. Here we report on recent progress aimed at characterizing the RF compression from the point of view of the microbunching instability. We emphasize the development of a linear theory for the gain function of the instability and its validation against macroparticle simulations that represents a useful tool in the evaluation of the compression schemes for FEL sources.

 
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.

 
TUPE021 Electron Beam Conditioning with IR/UV Laser on the Cathode 2182
 
  • G. Gatti, M. Bellaveglia, E. Chiadroni, L. Cultrera, M. Ferrario, D. Filippetto, C. Vicario
    INFN/LNF, Frascati (Roma)
  • A. Bacci, A.R. Rossi
    Istituto Nazionale di Fisica Nucleare, Milano
  • P. Musumeci
    UCLA, Los Angeles
  • H. Tomizawa
    JASRI/SPring-8, Hyogo-ken
 
 

Shining a photocathode at the same time with an UV laser able to extract electrons and an IR laser properly tuned could influence the way the electron beam is generated. Such a process is under investigation at SPARC, through direct measurements, as much as through computer codes assessment studies.

 
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.

 
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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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.

 
THPEC015 Breaking the Attosecond, Angstrom and TV/m Field Barriers with Ultra-fast Electron Beams 4080
 
  • J.B. Rosenzweig, G. Andonian, A. Fukasawa, E. Hemsing, G. Marcus, A. Marinelli, P. Musumeci, B.D. O'Shea, F.H. O'Shea, C. Pellegrini, D. Schiller, G. Travish
    UCLA, Los Angeles, California
  • P.H. Bucksbaum, M.J. Hogan, P. Krejcik
    SLAC, Menlo Park, California
  • M. Ferrario
    INFN/LNF, Frascati (Roma)
  • S.J. Full
    Penn State University, University Park, Pennsylvania
  • P. Muggli
    USC, Los Angeles, California
 
 

Recent initiatives at UCLA concerning ultra-short, GeV electron beam generation have been aimed at achieving sub-fs pulses capable of driving X-ray free-electron lasers (FELs) in single-spike mode. This uses of very low charge beams, which may allow existing FEL injectors to produce few-100 attosecond pulses, with very high brightness. Towards this end, recent experiments at the Stanford X-ray FEL (LCLS, first of its kind, built with essential UCLA leadership) have produced ~2 fs, 20 pC electron pulses. We discuss here extensions of this work, in which we seek to exploit the beam brightness in FELs, in tandem with new developments at UCLA in cryogenic undulator technology, to create compact accelerator/undulator systems that can lase below 0.15 Angstroms, or be used to permit 1.5 Angstrom operation at 4.5 GeV. In addition, we are now developing experiments which use the present LCLS fs pulses to excite plasma wakefields exceeding 1 TV/m, permitting a table-top TeV accelerator for frontier high energy physics applications.