LHC Performance Workshop (Chamonix 2016)

Session

Session 7: HL-LHC

Jan 28, 2016, 8:30 AM

Chamonix - Les Aiglons

Description

Chairs: Oliver Brüning
Scientific Secretary: Yannis Papaphilippou

26. Performance Limitations in HL-LHC after LIU Upgrade

Gianluigi Arduini

1/28/16, 8:30 AM

Session 7: HL-LHC

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...

27. RF Upgrade Paths

Erk Jensen

1/28/16, 8:55 AM

Session 7: HL-LHC

20' + 5'

• Time line and criteria for deciding between options (design; prototyping; construction; commissioning) so that they are ready by LS3?  is it already too late for some options?
• Implications / coordination with LIU upgrades
• What kind of feedback upgrade do we need (bandwidth)
• (provisionally)

28. Collimation Upgrade Path for the HL-LHC

Stefano Redaelli

1/28/16, 9:20 AM

Session 7: HL-LHC

20' + 5'

• The upgrade strategy for the LHC collimation system relies on various inputs from the LHC operation: loss rates, quench limits of magnet against beam losses, beam stability limit from collimator impedance, etc.
• The performance assessment based on the LHC Run I entails intrinsic uncertainties because of the differences in beam energy, bunch spacing and...

29. Crab Cavity Test Installation in the SPS

Giovanna Vandoni

1/28/16, 9:45 AM

Session 7: HL-LHC

20' + 5'

• Planning and interface with other integration activities -> time line
• Test program and goals
• (provisionally)

30. Coating Options for IR2 and IR8

Pedro Costa Pinto

1/28/16, 10:30 AM

Session 7: HL-LHC

20' + 5'

• Issue and how to tackle
  • Carbon coating
  • Laser patterning
• R&D and downselection process
• (Provisional)

31. Lessons Learned from the Civil Engineering Test Drilling and Earthquakes on LHC Vibration Tolerances

Jorg Wenninger

1/28/16, 10:55 AM

Session 7: HL-LHC

20' + 5'

• During Run 1 and in 2015 LHC operation has not been perturbed by vibrations and higher frequency (>1 Hz) ground motion. The effects of some large earthquakes was observed on the beam orbits, but no beam was lost or spoiled by such events.
• In the coming years two new sources of perturbations could possibly impact LHC operation: civil engineering for HL-LHC in...

32. Heavy Ion Operation after LS2

John Jowett

1/28/16, 11:20 AM

Session 7: HL-LHC

20' + 5'

• LHC Pb-Pb performance prospects and LIU projections compared to experiments' requests, updated in the light of the 2015 Pb-Pb run.
• Sharing options among the experiments including LHCb.
• Experience and fedback from ion MDs 2015
• Recommended running scenario and schedule.