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Vaccarezza, C.

Paper Title Page
MOZAG01 Simulations of the Emittance Compensation in Photoinjectors and Comparison with SPARC Measurements 21
 
  • C. Ronsivalle, L. Giannessi, M. Quattromini
    ENEA C. R. Frascati, Frascati (Roma)
  • A. Bacci, A. R. Rossi, L. Serafini
    INFN-Milano, Milano
  • E. Chiadroni, M. Ferrario, L. Ficcadenti, D. Filippetto, V. Fusco, B. Marchetti, M. Migliorati, A. Mostacci, L. Palumbo, C. Vaccarezza
    INFN/LNF, Frascati (Roma)
  • A. Cianchi
    INFN-Roma II, Roma
 
  FEL photoinjectors are based on the emittance compensation process, by which a high brightness beam can be accelerated without degradation. The experimental results obtained in the SPARC facility for which the beam dynamics has been extensively simulated confirm the theoretical predictions. The paper illustrates the most relevant beam dynamics results as well as a comparison between simulations and measurements.  
slides icon Slides  
MOPC037 Single Spike Operation in SPARC SASE-FEL 154
 
  • V. Petrillo, I. Boscolo
    Universita' degli Studi di Milano, Milano
  • A. Bacci, S. Cialdi, L. Serafini
    INFN-Milano, Milano
  • R. Bonifacio, M. Boscolo, M. Ferrario, C. Vaccarezza
    INFN/LNF, Frascati (Roma)
  • F. Castelli
    Università degli Studi di Milano, Milano
  • L. Giannessi, C. Ronsivalle
    ENEA C. R. Frascati, Frascati (Roma)
  • L. Palumbo
    Rome University La Sapienza, Roma
  • S. Reiche, J. B. Rosenzweig
    UCLA, Los Angeles, California
  • 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 in 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. The basic physics, the experimental parameters and 3-D simulations are discussed. Complete start-to-end simulations with realistic SPARC parameters are presented, in view of an experiment for tests on superradiant theory with the existing hardware.  
MOPC068 Preliminary Characterization of the Beam Properties of the SPARC Photoinjector 226
 
  • A. Cianchi
    INFN-Roma II, Roma
  • D. Alesini, M. Castellano, E. Chiadroni, L. Cultrera, G. Di Pirro, M. Ferrario, L. Ficcadenti, D. Filippetto, V. Fusco, G. Gatti, B. Marchetti, E. Pace, C. Vaccarezza, C. Vicario
    INFN/LNF, Frascati (Roma)
  • A. Mostacci
    Rome University La Sapienza, Roma
  • C. Ronsivalle
    ENEA C. R. Frascati, Frascati (Roma)
 
  The SPARC photoinjector is the test prototype of the recently approved SPARX project. It is used as R&D facility to perform accurate beam dynamics studies, comparing measurements and simulations. Emittance measurements at the gun exit and at the full energy has been performed and benchmarked with the simulations.  
TUPC105 Slice Emittance Measurements at SPARC Photoinjector with a RF Deflector 1305
 
  • C. Vaccarezza, D. Alesini, E. Chiadroni, G. Di Pirro, M. Ferrario, L. Ficcadenti, D. Filippetto, G. Gatti, B. Marchetti, E. Pace
    INFN/LNF, Frascati (Roma)
  • A. Cianchi
    Università di Roma II Tor Vergata, Roma
  • A. Mostacci
    Rome University La Sapienza, Roma
 
  The SPARC photoinjector is a R&D facility performing beam dynamics studies and driving a SASE-FEL. The RF deflector, completely designed and built by the SPARC team, allows measurements of the longitudinal properties of the beam bunch. Using it and the well know technique of the quadrupoles scan, the slice emittance has been measured in different conditions and benchmarked with the simulations.  
TUPP031 Electron Cloud Simulations for DAΦNE 1604
 
  • T. Demma, R. Cimino, S. Guiducci, C. Vaccarezza, M. Zobov
    INFN/LNF, Frascati (Roma)
 
  After the first experimental observations compatible with the presence of the electron cloud effect in the DAΦNE positron ring, a systematic study has been performed regarding the electron cloud build-up. To assess the effects of the electron cloud, simulations of the cloud build up were carried out using ECLOUD. In particular, we discuss modifications to the secondary emission model, build up for various filling patterns and different wiggler magnetic field models. The obtained numerical results are compared with experimental observations.  
WEPC069 A Possible THz Radiation Source with a Train of Short Pulses in the SPARC High Brightness Photoinjector 2154
 
  • M. Boscolo, M. Castellano, E. Chiadroni, M. Ferrario, A. Stella, C. Vaccarezza
    INFN/LNF, Frascati (Roma)
  • V. Petrillo
    Universita' degli Studi di Milano, Milano
 
  A radiofrequency electron gun followed by a compressor can generate trains of THz sub-picosecond electron pulses by illuminating the photocathode with a comb laser pulse. This structure of the beam can be used to produce coherent radiation. A feasibility study for a possible experiment at SPARC to be realized with the addition of a dedicated magnetic chicane is discussed. An optimization study of a magnetic chicane with a negative and variable R56 is studied, together with a set of parameters relative to the SPARC machine with the intent of demonstrating the feasibility of this experiment. The dynamics is studied within the SPARC system with the PARMELA code and with the RETAR code for the evaluation of the radiation.  
WEXG02 Crabbed Waist Collisions in DAΦNE and Super-B Design 1898
 
  • P. Raimondi, D. Alesini, M. E. Biagini, C. Biscari, R. Boni, M. Boscolo, F. Bossi, B. Buonomo, A. Clozza, G. O. Delle Monache, T. Demma, E. Di Pasquale, G. Di Pirro, A. Drago, A. Gallo, A. Ghigo, S. Guiducci, C. Ligi, F. Marcellini, G. Mazzitelli, C. Milardi, F. Murtas, L. Pellegrino, M. A. Preger, L. Quintieri, R. Ricci, U. Rotundo, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, S. Tomassini, C. Vaccarezza, M. Zobov
    INFN/LNF, Frascati (Roma)
  • N. Arnaud, D. Breton, P. Roudeau, A. Stocchi, V. Variola, B. F. Viaud
    LAL, Orsay
  • S. Bettoni
    CERN, Geneva
  • P. Branchini
    roma3, Rome
  • M. Esposito
    Rome University La Sapienza, Roma
  • I. Koop, E. B. Levichev, P. A. Piminov, D. N. Shatilov, V. V. Smaluk
    BINP SB RAS, Novosibirsk
  • K. Ohmi
    KEK, Ibaraki
  • E. Paoloni
    University of Pisa and INFN, Pisa
  • M. Schioppa
    INFN Gruppo di Cosenza, Arcavacata di Rende (Cosenza)
  • D. Teytelman
    SLAC, Menlo Park, California
  • P. Valente
    INFN-Roma, Roma
 
  The new idea of increasing the luminosity of a collider with crabbed waist collisions and first experimental results from DAΦNE using this concept are presented. Consequences for the design of future factories will be discussed. An outlook to the performance reach with crabbed waist collisions is given, with emphasis on future B Factories.  
slides icon Slides  
WEPC075 Recent Results and Future Perspectives of the SPARC Project 2169
 
  • 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, B. Marchetti, A. Marinelli, C. Marrelli, 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
    INFN-Milano, 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, 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
  • M. Mattioli, M. Serluca
    INFN-Roma, Roma
  • M. Migliorati, A. Mostacci
    Rome University La Sapienza, Roma
  • M. Petrarca
    Università di Roma I La Sapienza, Roma
  • J. B. Rosenzweig
    UCLA, Los Angeles, California
 
  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, a Thomson backscattering source and a plasma accelerator experiment. The SPARC photoinjector is also the test facility for the recently approved VUV FEL project named SPARX. As a first stage of the commissioning a complete characterization of the photoinjector has been accomplished with a detailed study of the emittance compensation process downstream the gun-solenoid system and the demonstration of the emittance oscillation in the drift. 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 and the demonstration of the “velocity bunching” technique in the linac. In this paper we report the experimental results obtained so far and the scientific program for the near future.  
WEPP036 DAΦNE Setup and Operation with the Crab-Waist Collision Scheme 2599
 
  • C. Milardi, D. Alesini, M. E. Biagini, C. Biscari, R. Boni, M. Boscolo, F. Bossi, B. Buonomo, A. Clozza, G. O. Delle Monache, T. Demma, E. Di Pasquale, G. Di Pirro, A. Drago, A. Gallo, A. Ghigo, S. Guiducci, C. Ligi, F. Marcellini, G. Mazzitelli, F. Murtas, L. Pellegrino, M. A. Preger, L. Quintieri, P. Raimondi, R. Ricci, U. Rotundo, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, S. Tomassini, C. Vaccarezza, M. Zobov
    INFN/LNF, Frascati (Roma)
  • N. Arnaud, D. Breton, P. Roudeau, A. Stocchi, V. Variola, B. F. Viaud
    LAL, Orsay
  • S. Bettoni
    CERN, Geneva
  • P. Branchini
    roma3, Rome
  • M. Esposito
    Rome University La Sapienza, Roma
  • I. Koop, E. B. Levichev, P. A. Piminov, D. N. Shatilov
    BINP SB RAS, Novosibirsk
  • K. Ohmi
    KEK, Ibaraki
  • E. Paoloni
    University of Pisa and INFN, Pisa
  • M. Schioppa
    INFN Gruppo di Cosenza, Arcavacata di Rende (Cosenza)
  • V. V. Smaluk
    BINP, Novosibirsk
  • P. Valente
    INFN-Roma, Roma
 
  In the second half of 2007 a major upgrade has been implemented on the Frascati DAΦNE collider in order to test the novel idea of Crab Waist collisions. New vacuum chambers and permanent quadrupole magnets have been designed, fabricated and installed to realize the new configuration. At the same time the performances of relevant hardware components, such as fast injection kickers and shielded bellows have been improved relying on new design concepts. The collider has been successfully commissioned in this new configuration. The paper describes the new layout as well as several experimental results about linear and non-linear optics setup and optimization, damping of beam instabilities and discusses the obtained luminosity performances.