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Ghigo, A.

Paper Title Page
WEO1A03 Instrumentation for Longitudinal Beam Gymnastics in FEL's and in the CLIC test facility 3 215
 
  • T. Lefèvre, H.-H. Braun, E. Bravin, S. Burger, R. Corsini, S. Döbert, L. Søby, F. Tecker, P. Urschütz, C. P. Welsch
    CERN, Geneva
  • D. Alesini, C. Biscari, B. Buonomo, O. Coiro, A. Ghigo, F. Marcellini, B. Preger
    INFN/LNF, Frascati (Roma)
  • P. Craievich, M. Ferianis, M. Veronese
    ELETTRA, Basovizza, Trieste
  • A. E. Dabrowski, M. Velasco
    NU, Evanston
  • A. Ferrari
    UU/ISV, Uppsala
  
  Built at CERN by an international collaboration, the CLIC Test Facility 3 (CTF3) aims at demonstrating the feasibility of a high luminosity 3TeV e+-e- collider by the year 2010. One of the main issues to be demonstrated is the generation of a high average current (30A) high frequency (12GHz) bunched beam by means of RF manipulation. At the same time, Free Electron Lasers (FEL) are developed in several places all over the world with the aim of providing high brilliance photon sources. These machines all rely on the production of high peak current electron bunches. The required performances put high demands on the diagnostic equipment and innovative longitudinal monitors have been developed during the past years. This paper gives an overview of the longitudinal instrumentation developed at ELETTRA and CTF3, where a special effort was made in order to implement at the same time non-intercepting devices for online monitoring, and destructive diagnostics which have the advantage of providing more detailed information.  
WEO2A03 Advanced Measurements at the SPARC Photoinjector 224
 
  • A. Cianchi, L. Catani
    INFN-Roma II, Roma
  • D. Alesini, M. Bellaveglia, R. Boni, M. Boscolo, M. Castellano, E. Chiadroni, A. Clozza, L. Cultrera, G. Di Pirro, A. Drago, A. Esposito, M. Ferrario, D. Filippetto, V. Fusco, A. Gallo, G. Gatti, A. Ghigo, M. Incurvati, C. Ligi, E. Pace, L. Pellegrino, R. Ricci, C. Ronsivalle, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, F. Tazzioli, S. Tomassini, C. Vaccarezza, M. Vescovi, C. Vicario
    INFN/LNF, Frascati (Roma)
  • A. Bacci, S. Cialdi, A. R. Rossi, L. Serafini
    INFN-Milano, Milano
  • A. M. Cook, M. P. Dunning, P. Frigola, P. Musumeci, J. B. Rosenzweig
    UCLA, Los Angeles, California
  • L. Giannessi, M. Quattromini
    ENEA C. R. Frascati, Frascati (Roma)
  • M. Migliorati, A. Mostacci, L. Palumbo
    Rome University La Sapienza, Roma
  • M. Petrarca
    INFN-Roma, Roma
  
  The objective of the first stage of the SPARC commissioning was the optimization of the RF-gun setting that best matches the design working point and a detailed study of the emittance compensation process providing the optimal value of emittance at the end of the linac. For this purpose an innovative beam diagnostic, the emittance-meter, consisting of a movable emittance measurement system, was conceived and built. More than a simple improvement over conventional, though non-trivial, beam diagnostic tools this device defines a new strategy for the characterization of new high performance photo-injectors. The emittance meter allows to measure at different location along the beamline the evolution of important beam parameters both in longitudinal and in the transverse phase space such as beam sizes, energy spread and rms transverse emittances in a region where the space-charge effect dominate the electron dynamics. The quality and the amount of the data allowed a clear reconstruction of the phase space evolution. We report also the first experimental observation of the double emittance minima effect on which is based the optimized matching with the SPARC linac