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    LHC Performance Workshop - Chamonix 2009

    2–6 Feb 2009
    Chamonix
    Europe/Zurich timezone
    DISCLAIMER “The Chamonix workshop was an open exchange of views and opinions. All the presentations made at the workshop are available here. The views expressed in individual presentations do not necessarily represent those of the CERN management.”

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    Session

    Session 04 - Strategy for consolidation to avoid incident and limit collateral damage

    S04
    3 Feb 2009, 17:00
    Le Majestic (Chamonix)

    Le Majestic

    Chamonix

    Presentation materials

    1. 51. Insulation vacuum and beam vacuum overpressure release
      Vittorio Parma
      03/02/2009, 17:00
      There is evidence that the incident of 19th September caused a high pressure build-up inside the cryostat insulation vacuum which the existing overpressure devices could not contain. As a result, high longitudinal forces acting on the insulation vacuum barriers developed and broke the floor and the floor fixations of the SSS with vacuum barriers. The consequent large longitudinal displacements...
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    2. 52. Improved anchoring of SSS with vacuum barrier to avoid displacement
      Ofelia Capatina
      03/02/2009, 17:35
      As presented in the previous speech, the incident in sector 3-4 of the LHC caused a high pressure build-up inside the cryostat insulation vacuum resulting in high longitudinal forces acting on the insulation vacuum barriers. This resulted in braking floor and floor fixations of the SSS with vacuum barrier. The strategy of improving anchoring of SSS with vacuum barrier to avoid displacement is...
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    3. 93. Bus bar joints stability and protection
      Arjan Verweij
      03/02/2009, 18:05
      A defective bus connection between two dipole magnets was the primary cause of the incident in sector 34 on September 19th. I will show how this could have happened, i.e. how a highly resistive joint has caused a thermal runaway and burned (or opened) before the QPS threshold was reached. In the second part of the talk I will present the new detection limits for the QPS upgrade of the RB and...
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    4. 70. QPS Upgrade and Re-commissioning
      Reiner Denz
      03/02/2009, 18:40
      Prior to the re-start of the Large Hadron Collider LHC in 2009 the protection system for superconducting devices QPS will be submitted to a substantial upgrade. The foreseen modifications will enhance the capability of the system in detecting problems related to the electrical interconnections between superconducting magnets as well as the detection of so-called aperture symmetric quenches in...
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    5. 95. Risk Analysis for the Different Consolidation Proposals
      Jim Strait
      03/02/2009, 19:20
      In parallel with the repairs in sector 34, improvements are planned to a number of systems, to allow safe detection of faults similar to the one which caused the incident of 19 September, and to limit the damage should a similar incident nonetheless occur. These include improved bus and quench detection systems, improved pressure relief for the insulating and beam vacuum systems, and...
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