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)
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
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...
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
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)
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
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
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
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
