Author: Bestmann, P.
Paper Title Page
THXXPLM2 Demonstration of Loss Reduction Using a Thin Bent Crystal to Shadow an Electrostatic Septum During Resonant Slow Extraction 3399
  • F.M. Velotti, P. Bestmann, M.E.J. Butcher, M. Calviani, M. Di Castro, M. Donzé, L.S. Esposito, M.A. Fraser, M. Garattini, S.S. Gilardoni, B. Goddard, V. Kain, J. Lendaro, A. Masi, D. Mirarchi, M. Pari, J. Prieto, S. Redaelli, R. Rossi, W. Scandale, R. Seidenbinder, P. Serrano Galvez, L.S. Stoel, C. Zamantzas, V. Zhovkovska
    CERN, Meyrin, Switzerland
  • F.M. Addesa, F. Iacoangeli
    INFN-Roma, Roma, Italy
  • A.G. Afonin, Y.A. Chesnokov, A.A. Durum, V.A. Maisheev, Yu.E. Sandomirskiy, A.A. Yanovich
    IHEP, Moscow Region, Russia
  • J.E. Borg, M. Garattini, G. Hall, T. James, M. Pesaresi
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • A.S. Denisov, Y. Gavrikov, Yu.M. Ivanov, M.A. Koznov, L.G. Malyarenko, V. Skorobogatov
    PNPI, Gatchina, Leningrad District, Russia
  • F. Galluccio
    INFN-Napoli, Napoli, Italy
  • F. Murtas
    INFN/LNF, Frascati, Italy
  A proof-of-principle experiment demonstrating the feasibility of using a thin, bent crystal aligned upstream of an extraction septum (ES) to increase the efficiency of the third-integer resonant slow extraction process has been carried out at the CERN Super Proton Synchrotron (SPS). With the primary aim of reducing the beam loss and induced radio-activation of the SPS, the crystal was aligned to both the beam and the septum to reduce by up to 40% the beam intensity impinging the ES and increase the intensity entering the external transfer line. In this contribution, we introduce the concept and the prototype system that was installed in 2018 before reporting in detail on the dedicated program of machine development studies carried out to characterise its performance and demonstrate operational feasibility. The performance reach and compatibility with other loss reduction techniques proposed to further increase the extraction efficiency, such as phase space folding with octupoles, is discussed in view of future high intensity operation.  
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About • paper received ※ 15 May 2019       paper accepted ※ 28 May 2019       issue date ※ 21 June 2019  
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