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Chattopadhyay, S.

Paper Title Page
TUPEB037 Interaction-Region Design Options for a Linac-Ring LHeC 1605
 
  • F. Zimmermann, S. Bettoni, O.S. Brüning, B.J. Holzer, S. Russenschuck, D. Schulte, R. Tomás
    CERN, Geneva
  • H. Aksakal
    N.U, Nigde
  • R. Appleby
    UMAN, Manchester
  • S. Chattopadhyay, M. Korostelev
    Cockcroft Institute, Warrington, Cheshire
  • A.K. Çiftçi, R. Çiftçi, K. Zengin
    Ankara University, Faculty of Sciences, Tandogan/Ankara
  • J.B. Dainton, M. Klein
    The University of Liverpool, Liverpool
  • E. Eroglu, I. Tapan
    UU, Bursa
  • P. Kostka
    DESY Zeuthen, Zeuthen
  • V. Litvinenko
    BNL, Upton, Long Island, New York
  • E. Paoloni
    University of Pisa and INFN, Pisa
  • A. Polini
    INFN-Bologna, Bologna
  • U. Schneekloth
    DESY, Hamburg
  • M.K. Sullivan
    SLAC, Menlo Park, California
 
 

In a linac-ring electron-proton collider based on the LHC ("LR-LHeC"), the final focusing quadrupoles for the electron beam can be installed far from the collision point, as far away as the proton final triplet (e.g. 23 m) if not further, thanks to the small electron-beam emittance. The inner free space could either be fully donated to the particle-physics detector, or accommodate "slim" dipole magnets providing head-on collisions of electron and proton bunches. We present example layouts for either scenario considering electron beam energies of 60 and 140 GeV, and we discuss the optics for both proton and electron beams, the implied minimum beam-pipe dimensions, possible design parameters of the innermost proton and electron magnets, the corresponding detector acceptance, the synchrotron radiation power and its possible shielding or deflection, constraints from long-range beam-beam interactions as well as from the LHC proton-proton collision points and from the rest of the LHC ring, the passage of the second proton beam, and the minimum beta* for the colliding protons.

 
TUPEB039 Designs for a Linac-Ring LHeC 1611
 
  • F. Zimmermann, O.S. Brüning, E. Ciapala, F. Haug, J.A. Osborne, D. Schulte, Y. Sun, R. Tomás
    CERN, Geneva
  • C. Adolphsen
    SLAC, Menlo Park, California
  • R. Calaga, V. Litvinenko
    BNL, Upton, Long Island, New York
  • S. Chattopadhyay
    Cockcroft Institute, Warrington, Cheshire
  • J.B. Dainton, M. Klein
    The University of Liverpool, Liverpool
  • A.L. Eide
    LPNHE, Paris
 
 

We consider three different scenarios for the recirculating electron linear accelerator (RLA) of a linac-ring type electron-proton collider based on the LHC (LHeC): i) a basic version consisting of a 60 GeV pulsed, 1.5 km long linac, ii) a higher luminosity configuration with a 60 GeV 4 km long cw energy-recovery linac (ERL), and iii) a high energy option using a 140 GeV pulsed linac of 4 km active length. This paper describes the footprint, optics of linac and return arcs, emittance growth from chromaticity and synchrotron radiation, a set of parameters, and the performance reach for the three scenarios.