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10th LHC Operations "Evian" Workshop

22–25 Nov 2021
CERN
Europe/Zurich timezone

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Session

Session 5

25 Nov 2021, 09:00
500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium

CERN

400
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Conveners

Session 5: Commissioning & Operation 2022

  • Theodoros Argyropoulos (CERN)
  • Georges Trad (CERN)

Session 5: Commissioning & Operation 2022

  • Georges Trad (CERN)
  • Theodoros Argyropoulos (CERN)

Session 5: Commissioning & Operation 2022

  • Georges Trad (CERN)
  • Theodoros Argyropoulos (CERN)

Presentation materials

Evian session 5 Main points.pdf
Evian session 5 Main points.pptx
  1. 28. Beam commissioning major phases and planning (20'+ 10')
    Matteo Solfaroli Camillocci (CERN)
    25/11/2021, 09:00

    The LHC beam operation will restart in March 2022, the commissioning will be a challenge. Many systems will have to be made operational again after the Long Shutdown and their performance checked. Thanks to the LIU upgrade, the injector complex will deliver beams with increased intensity and reduced emittance. The response of the LHC and its technical systems will have to be verified. This...

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  2. 23. E-cloud, scrubbing and heat load after LS2 (20' + 10')
    Lotta Mether (CERN)
    25/11/2021, 09:30

    In Run 2, routine LHC operation was done for the first time with 25 ns bunch spacing, leading to an increased electron cloud production. Although significant mitigation through beam-induced scrubbing was achieved, electron cloud affected beam stability and quality throughout the run. In addition, strong heat loads were generated on the beam screens of the superconducting magnets, with a large...

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  3. 24. BLM threshold (15' + 5'')
    Belen Maria Salvachua Ferrando (CERN)
    25/11/2021, 10:00

    The LHC Beam Loss monitoring system is a key element in machine protection. Near 4000 beam loss detectors, ionisation chambers, are installed along the LHC protecting machine equipment by triggering a beam extraction in less than 3 LHC turns. Each detector is able to trigger a beam dump when its signal exceeds predetermined thresholds as function of the beam energy and 12 different running...

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  4. 40. UFO strategy (15' + 5')
    Anton Lechner (CERN)
    25/11/2021, 10:20

    Dust particles interacting with the proton beams - commonly referred as UFOs - were the main source of transient beam losses in the past operation of the LHC. UFOs gave rise to 40 premature beam dumps and 8 dipole quenches in Run 2, resulting in the loss of more than 200 hours of beam time. The risk of dumps and quenches critically depends on the UFO event rate, which had significantly...

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  5. 29. A Machine Protection Systems perspective on the commissioning (20' + 10')
    Christoph Wiesner (CERN)
    25/11/2021, 11:10

    During Run 3 of the LHC, the stored energy per beam is expected to reach 500 MJ. In addition, new scenarios, as the extended use of beta* levelling, will increase the operational complexity. The talk will review the commissioning strategy of the machine-protection systems in 2022,considering the experience of the recent beam test. It will then examine the existing intensity limits and discuss...

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  6. 31. An OMC perspective on the commissioning (20' + 10')
    Tobias Hakan Bjorn Persson (CERN)
    25/11/2021, 11:40

    In the beginning of Run 2, the beta was 80 cm and it was gradually squeezed down to finally reach 25 cm in 2018. In Run 3, the goal is to reach a beta of 30 cm already during the first year, which poses a series of challenges as to commission several production optics in the start-up. In Run 2 it was demonstrated that coupling control was critical for beam stability and luminosity...

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  7. 30. A Collimation perspective on the commissioning (20' + 10')
    Daniele Mirarchi (CERN)
    25/11/2021, 12:10

    A comprehensive review of experience gained during the 2021 test beam is presented, on which perspective on 2022 beam commissioning are built. The main focus is given to the beam-based alignment and validation strategy of collimation performance, together with proposed settings with non favourable TCT/TCDQ phase advance. Global and local aperture measurements are discussed, and relative...

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  8. 20. MDs in 2022 (20' + 10')
    Jan Uythoven (CERN)
    25/11/2021, 14:00

    This presentation gives an overview of the different Machine Development topics and time required in 2022, as they have been identified by the different teams participating in the MD program. The possibility of synergies between the different topics is studied. With this in mind, an estimate of the total time required for MDs in 2022 is given and compared with the present draft schedule.
    The...

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  9. 27. Lessons learned from the 2021 Beam test (20' + 10')
  10. 26. Looking back to the HWC & Magnet training campaign
  11. 25. Powering tests (20' + 10')
    Andrea Apollonio (CERN), Matteo Solfaroli Camillocci (CERN)

    Focus on changes with an impact on Run3 operation:
    - energy extraction removal for RSS (skew sextupole),
    - reduced pre-cycle current,
    - circuits non-conformities new and resolved in LS2,
    - 11 T and trimming strategies,
    - global protection mechanism,
    - FGCLite and RadTol converters in RRs

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