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Russenschuck, S.

Paper Title Page
TUPEB034 Interaction Region Design for a Ring Ring Version of the LHeC Study 1596
 
  • B.J. Holzer, S. Bettoni, O.S. Brüning, S. Russenschuck
    CERN, Geneva
  • R. Appleby
    UMAN, Manchester
  • J.B. Dainton, L.N.S. Thompson
    Cockcroft Institute, Warrington, Cheshire
  • M. Klein
    The University of Liverpool, Liverpool
  • A. Kling, B. Nagorny, U. Schneekloth
    DESY, Hamburg
  • P. Kostka
    DESY Zeuthen, Zeuthen
  • A. Polini
    INFN-Bologna, Bologna
 
 

The LHeC aims at colliding hadron-lepton beams with center of mass energies in the TeV scale. For this purpose the existing LHC storage ring is extended by a high energy electron accelerator in the energy range of 60 to 140 GeV. The electron beam will be accelerated and stored in a LEP like storage ring in the LHC tunnel. In this paper we present the layout of the interaction region which has to deliver at the same time well matched beam optics and an efficient separation of the electron and proton beams. In general the large momentum difference of the two colliding beams provides a very elegant way to solve this problem: A focusing scheme that leads to the required beam sizes of the electrons and protons is combined with an early but gentle beam separation to avoid parasitic beam encounters and still keep the synchrotron radiation level in the IR within reasonable limits. We present in this paper two versions of this concept: A high luminosity layout where the mini beta magnets are embedded into the detector design as well as an IR design that is optimised for maximum acceptance of the particle detector.

 
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.