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9th LHC Operations Evian Workshop

30 January 2019 to 1 February 2019
Hotel Ermitage
Europe/Zurich timezone

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Session

Session 4: Beam performance during run 2

31 Jan 2019, 16:00
Hotel Ermitage

Hotel Ermitage

Evian-les-Bains

Conveners

Session 4: Beam performance during run 2

  • Guido Sterbini (CERN)
  • Michaela Schaumann (CERN)

Session 4: Beam performance during run 2

  • Michaela Schaumann (CERN)
  • Guido Sterbini (CERN)

Presentation materials

summary4.tex
SUMMARY_OF_SESSION_4___Beam_performance_during_run2.pdf
  1. 32. Machine Configuration (20' + 10')
    Roderik Bruce (CERN)
    31/01/2019, 16:00
    • Run 2 machine configuration (focus on beta*, crossing angle and collimation settings)
    • Aperture measurements, influence on beta start, levelling options and collimation settings
    • Evolution of the collimation configuration during Run2 and justification
    • Impact on performance
    • Lessons learned
    Go to contribution page
  2. 33. Transverse Emittance Blow up (15' + 10')
    Stefania Papadopoulou (CERN)
    31/01/2019, 16:30
    • Fundamental mechanisms of blow up, mechanism included in simulation.
    • Luminosity model recap
    • Emittance blow up along Run2
    • Emittance blow up at injection, along the cycle and in STABLE (emittance from experiment, emittance scans, BSRT)
    • BSRT calibration and influence on conclusions
    • Observations in comparison to model: do we understand the extra emittance blow up?
    • Scaling with...
    Go to contribution page
  3. 34. Luminosity, lifetime and modelling (15' + 10')
    Sofia Kostoglou (National Technical Univ. of Athens (GR))
    31/01/2019, 16:55
    • Lifetime/losses during the cycle (BCT, FBCT)
    • Lifetime during the levelling (crossing angle, beta*, separation)
    • Dependence on beam-beam encounter schedule
    • DA studies for crossing angle levelling
    • Asymmetry B1/2
    • Impact on chromaticity, octuples, tunes
    • Status of the luminosity model
    Go to contribution page
  4. 35. Special Losses (15' + 10')
    Daniele Mirarchi (University of Manchester (GB))
    31/01/2019, 17:20
    • Overview of BLM threshold strategy
    • UFOs: Are they still an issue? Statistics of Run2 and projections for Run3
    • ULO
    • 16L2: understanding, mitigation strategy, lessons learnt and actions taken
    • 10 Hz dumps (protons/ions)
    Go to contribution page
  5. 36. Electron Cloud & Heat Loads (20' + 10')
    Giovanni Iadarola (CERN)
    31/01/2019, 17:45
    • Overview of e-cloud studies and observations in Run2
    • Different behaviour of sector
    • Extra instrumentation
    • Implications for machine operation
    • Interventions planed in LS2
    • Performance limitation for Run3
    Go to contribution page
  6. 37. Transverse Instabilities (20' + 10')
    Xavier Buffat (CERN)
    01/02/2019, 08:30
    • Overview of coherent instabilities in all operational phases during Run2
    • Impact on performance
    • Diagnostics and tools
    • Mitigation strategies evolution and plans
    Go to contribution page
  7. 38. Longitudinal dynamics (20' + 10')
    Helga Timko (CERN)
    01/02/2019, 09:00
    • Overview of advances during Run2
    • Controlled longitudinal blow up during ramp and collisions
    • Phase control issues encountered
    • Full and half detuning
    • Capture voltage optimisation
    • PELP and PPLP
    • Intensity limitations
    • Prospects for Run3
    Go to contribution page
  8. 39. Machine Developments (20' + 10')
    Jan Uythoven (CERN)
    01/02/2019, 09:30
    • Overview and statistics of MD periods and priorities in Run2
      (number of MD's, MD categories, End-of-fill MDs, time spend, unavailable MD time, LHC/HL-LHC/Physics Beyond Colliders)
    • What moved into operation?
    • Organisational and machine protection aspects
    • Prospects for Run3
    Go to contribution page
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