Jan 25 – 28, 2016
Chamonix - Les Aiglons
Europe/Zurich timezone

Performance Limitations in HL-LHC after LIU Upgrade

Jan 28, 2016, 8:30 AM
Chamonix - Les Aiglons

Chamonix - Les Aiglons

Session 7: HL-LHC Session 7: HL-LHC


Gianluigi Arduini


20' + 5'
  • HL-LHC upgrades during LS2 (collimators, TDIS, cryogenics, coating of IP2 and IP8 triplet beam screens)
  • Beta* reach and performance (optics, ATS, flat vs. round)
  • Validation of the levelling scenarios driven by pile-up measurements (beta* levelling in IP1/5 and separation in IP2/8) with high brightness beams
  • Expected limitations (aperture, heat loads in the IR1/5 triplets from electron cloud, debris, impedance, )
  • Validation of heat load dependence due to electron cloud on bunch population
  • Validation of the longitudinal stability limits (coupled bunch) confirming the longitudinal stability up to HL-LHC parameters with a single RF system
  • Validation of the operation of the 400 MHz system in full detuning mode
  • Performance with head-on and long range limits comparable to HL-LHC
  • Stability limits and effect of the impedance reduction campaign
  • Emittance control for very high brightness beams (BCMS)
  • Halo measurement and control
  • Losses and margin with respect to quench limits (need or not of IR7 dispersion suppressor collimators)
  • Component heating and validation of the upgrade scenarios (e.g. confirm that the present MKI design is compatible with the HL-LHC beams for bunch lengths in the range of 8 to 10 cm)

Presentation materials