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Meinschad, T.

Paper Title Page
MOP039 The SPL (II) at CERN, a Superconducting 3.5-GeV H- Linac 127
 
  • F. Gerigk, G. Bellodi, E. Benedico Mora, Y. Body, F. Caspers, R. Garoby, K. Hanke, C. E. Hill, H. Hori, J. Inigo-Golfin, K. Kahle, T. Kroyer, D. Kuchler, J.-B. Lallement, M. Lindroos, A. M. Lombardi, L. A. Lopez Hernandez, M. Magistris, T. Meinschad, A. Millich, E. Noah, M. M. Paoluzzi, M. Pasini, C. Rossi, J.-P. Royer, M. Sanmarti, E. Zh. Sargsyan, R. Scrivens, M. Silari, T. Steiner, J. Tuckmantel, M. Vretenar
    CERN, Geneva
  • M. A. Baylac, J.-M. De Conto, E. Froidefond
    LPSC, Grenoble
  • S. Chel, R. Duperrier, D. Uriot
    CEA, Gif-sur-Yvette
  • C. Pagani, P. Pierini
    INFN/LASA, Segrate (MI)
  • V. Palladino
    INFN-Napoli, Napoli
  
  A revision of the physics needs and recent progress in the technology of superconducting (SC) RF cavities have triggered major changes in the design of a SC H- linac at CERN. With 4 - 5 MW beam power, the SPL can be the proton driver for a next generation ISOL-type radio-active beam facility ("EURISOL") and/or supply protons to a neutrino facility (conventional superbeam + beta-beam or neutrino factory). Furthermore the SPL can replace Linac2 and the PS booster, improving significantly the beam performance in terms of brightness, intensity, and reliability for the benefit of all proton users at CERN, including LHC and its luminosity upgrade. Compared with the first conceptual design, the beam energy is almost doubled (3.5 GeV instead of 2.2 GeV) while the length is reduced by 40%. At a repetition rate of 50 Hz, the linac re-uses decommissioned 352.2 MHz RF equipment from LEP in the low-energy part. Beyond 90 MeV the RF frequency is doubled, and from 180 MeV onwards high-gradient SC bulk-niobium cavities accelerate the beam to its final energy of 3.5 GeV. This paper presents the overall design approach, together with the technical progress since the first conceptual design in 2000.  
TUP042 A Proposal for Post Acceleration, Matching and Measuring the H- Ion Beam at CERN's Linac 4 Test Stand 343
 
  • R. Scrivens, M. B. Jensen, D. Kuchler, T. Meinschad, F. J.C. Wenander
    CERN, Geneva
  
  CERN's proposed future Linac 4 is a 160 MeV H- Linac injecting into the Proton Sychrotron Booster. We propose that the ion source parameters (80mA, 500us pulse length, 2Hz repetition rate, 0.25 mm.mrad normalised emittance at 1 σ) may be achieved by improving an existing 2MHz RF multicusp source. In this report, we explain the proposal to post-accelerate the beam from 35keV to 95keV, and to focus the beam into the RFQ with solenoids, with the aimof avoiding substantial emittance growth. Finally, details of the diagnostics required to test the source are given.