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De Salvador, D.

Paper Title Page
TUPLS016 Characterization of Crystals for Steering of Protons through Channelling in Hadronic Accelerators 1523
 
  • V. Guidi, S. Baricordi, M. Fiorini, G. Martinelli, A. Mazzolari, E. Milan
    UNIFE, Ferrara
  • E. Boscolo Marchi, G. Della Mea, R. Milan, S. Todros, A. Vomiero
    INFN/LNL, Legnaro, Padova
  • A. Carnera, D. De Salvador, A. Sambo
    Univ. degli Studi di Padova, Padova
  • Y.A. Chesnokov
    IHEP Protvino, Protvino, Moscow Region
  • Yu.M. Ivanov
    PNPI, Gatchina, Leningrad District
  • W. Scandale
    CERN, Geneva
 
  Channeling of relativistic particles through a crystal may be useful for many applications in accelerators, and particularly for collimation in hadronic colliders. Efficiency proved to be dependent on the state of the crystal surface and hence on the method used for preparation. We investigated the morphology and structure of the surface of the samples that have been used in accelerators with high efficiency. We found that crystal fabrication by only mechanical methods (dicing, lapping, and others) leads to a superficial damaged layer, which is correlated to performance limitation in accelerators. A planar chemical etching was studied and applied in order to remove the superficial damaged layer. RBS analysis with low-energy protons highlighted better crystal perfection at surface, as a result of the etching. Finally, measurement with 70-GeV protons at IHEP demonstrated a superior performance of the chemically cleaned crystals with respect to conventional samples. A protocol for preparation and characterization of crystal for channelling has been developed, which may be of interest for reliable operation with crystals in accelerators.