THIP —  Plenary Session - Preparations for Future Machines   (07-Oct-21   09:00—10:00)
Chair: S.S. Gilardoni, CERN, Meyrin, Switzerland
Paper Title Page
HL-LHC: Project Status and Beam Dynamics Challenges  
  • S. Redaelli
    CERN, Geneva, Switzerland
  The Large Hadron Collider (LHC) at CERN has been producing physics data since 2010. It will be upgraded in the years 2025-27 to sustain and further extend its physics discovery potential. The High-luminosity LHC upgrade (HL-LHC) targets at least a factor five increase of peak luminosity, and a ten-fold improvement of integrated luminosity, compared to the LHC design. To achieve this, the HL-LHC beams are two times more intense and more than five times brighter. These ambitious goals pose obvious beam dynamics challenges that will be addressed through several upgrades of the LHC accelerator. The HL-LHC will use high-field superconducting magnets based on Nb3Sn for the final beam focusing, crab cavities to optimize luminosity conditions, a new generation of collimators that withstand the higher operational beam losses while reducing the beam impedance, hollow electron lenses for active halo control as well as crystal collimators for improved cleaning efficiency for heavy-ion beams. This advances the LHC state-of-the-art accelerator technology in various domains. This contribution reviews the plans and status of the HL-LHC upgrade and the main challenges associated with this project.  
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Beam Physics Challenges of EIC  
  • F.J. Willeke
    BNL, Upton, New York, USA
  The Electron Ion Collider under construction at Brookhaven National Laboratory, will provide unprecedented information about the origin of the properties of nucleons and nuclei. The requirement on the accelerator is quite demanding with luminosity in the order of 1E34/s/cm2, 70% spin polarized electrons and light ion beams, large range of center of mass energies (30-140 GeV) and collisions of electrons with a large range of ions from protons to Uranium. To implement this new collider, many interesting accelerator science questions have to be resolved which include beam-beam interaction with a large crossing angle of 25 mrad, dynamic aperture in presence of a highly constraint high luminosity interaction region, electron storage ring with an average polarization of 70% for both spin up and spin down in the same store, and with the required high beam currents of 2.5 A electrons and up to 1 A hadrons, some interesting high intensity effects such as fast ion instability and strong transient beam loading effects. The presentation will provide an overview of the accelerator physics of the electron ion collider.  
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