LHC QPS Review Committee

Europe/Zurich
CERN

CERN

Description
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External Panel for Review of the Enhanced Quench Protection System<o:p></o:p>

The external enhanced QPS review panel is one of two panels set up by the CERN management. The other, the “risk” review is to examine the risks to future operation of the LHC, taking into account the implementation of the technical and operational measures foreseen and being implemented following the incident of 19th September 2008.<o:p></o:p>

Following an understanding of the behavior of the QPS system on 19th September, the mandate of the review panel is to:

  • Review in terms of completeness, the functional specifications of the proposed new system, in particular, the strategy for the proposed new scheme to detect (and protect against) abnormally high resistance “splices” and the detection of a symmetric quench.<o:p></o:p>

  • <o:p></o:p> Review and analyze the technical details of the proposed implementation of the new enhanced Quench Detection and Protection system paying particular attention to the critical nature of the system with respect to LHC operation.<o:p></o:p><o:p></o:p>

  • <o:p></o:p> Examine all operational issues associated with the new system in particular the two extremes of failing to trigger when necessary and spuriously triggering unnecessarily and thereby causing down time of the LHC.<o:p></o:p><o:p></o:p>

  • <o:p></o:p> Review the planning schedule foreseen for the completion of the new Enhanced QPS system and define priorities (high resistance splice detection vs symmetric quench).<o:p></o:p>

  • Review the robustness of the new system which should operate reliably during many years in a hostile environment (including radiation) of the LHC tunnel.<o:p></o:p>

Members:
Reinhard Bacher, DESY
George Ganetis, BNL
Howard Pfeffer, FNAL
Dan Stout, ITER
Jim Strait, FNAL
Jay Theilacker (Chair), FNAL

For your information :
LHC Performance Workshop Chamonix 2009


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Final report
    • 8:30 AM 8:45 AM
      Executive session 6/2-004

      6/2-004

      CERN

      40
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    • 8:45 AM 9:00 AM
      Introduction 6/2-004

      6/2-004

      CERN

      40
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    • 9:00 AM 1:00 PM
      Summary talks 6/2-004

      6/2-004

      CERN

      40
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      • 9:00 AM
        How all the systems are working together (30’+15') (Powering interlocks for the LHC) 30m
        Speaker: Markus Zerlauth
        Slides
      • 9:45 AM
        Summary of the 34 event (30’+15') 30m
        Speaker: Pierre Strubin
        Slides
      • 10:30 AM
        coffee break 15m
      • 10:45 AM
        Busbar joint stability (30’+15') 30m
        Speaker: Arjan Verweij
        Slides
      • 11:30 AM
        Busbar quench protection enhancement (20’+10') 20m
        Speaker: Knud Dahlerup-Petersen
        document
        Slides
    • 12:30 PM 2:00 PM
      Lunch 1h 30m
    • 2:00 PM 3:30 PM
      Attend summary sessions of the LHC Performance Workshop 500/1-001 - Main Auditorium

      500/1-001 - Main Auditorium

      CERN

      400
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      agenda
    • 3:45 PM 4:00 PM
      transport from main building (steps) to bldg. 30 15m
    • 4:00 PM 5:30 PM
      Executive session 30/5-039

      30/5-039

      CERN

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    • 5:30 PM 6:30 PM
      Discussion of agenda for Wednesday 30/5-039

      30/5-039

      CERN

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    • 8:30 AM 5:30 PM
      Individual short presentations/discussions addressing panel questions 30/5-039

      30/5-039

      CERN

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      • 8:30 AM
        Symmetric quench experience and planned solution (20’+10') 30m
        Speaker: Reiner Denz
        Slides
      • 9:00 AM
        Are there any other superconducting busses not being monitored by a quench detection system: the diode area 15m
        Speaker: Michael Koratzinos
        Slides
      • 9:15 AM
        Are there any other superconducting busses not being monitored by a quench detection system: 13kA & 6kA & 600A 20m
        Speaker: Robert Henry Flora
        Slides
      • 9:40 AM
        Mechanical details of the bypass diodes 15m
        Speaker: Knud Dahlerup-Petersen
      • 9:55 AM
        How were the diodes tested prior to installation 15m
        Speaker: Andrzej Siemko
        Slides
      • 10:10 AM
        Stresses on diode joints 20m
        Speaker: Knud Dahlerup-Petersen
      • 10:30 AM
        coffee break 20m
      • 10:50 AM
        Effects of standard component failures as well as radiation damage on the operation of the QPS (fail safe or not). What design features make the system fail safe? Details on the detection circuits. 30m
        Speaker: Reiner Denz
        Slides
      • 11:20 AM
        What limits the maximum negative di/dt for the magnet systems 20m
        Speaker: Hugues Thiesen
      • 11:40 AM
        Which experiences have been gained from the accident with respect to the expected behaviour of the existing QPS. Did everything react as designed? Did quenches propagate along the magnet chain due to transients and sudden current changes? 30m
        Speaker: Sandrine Le Naour
        Slides
      • 12:10 PM
        MI^2T limits for magnets, what are they and how where they developed. Time budgets for detection and energy extraction for the various magnet system. 15m
        Speaker: Andrzej Siemko
        Slides
      • 12:40 PM
        lunch 1h 20m
      • 2:00 PM
        Description of energy extraction components and design criteria 15m
        Speaker: Knud Dahlerup-Petersen
        Slides
      • 2:15 PM
        How does electromagnetic noise (from environment and beam) affect the novel protection circuits for bus bar splices? 15m
        Speaker: Robert Henry Flora
        Slides
      • 2:30 PM
        Reserve 15m
      • 2:45 PM
        Procedures used and the resulting traveler associated with the failed busbar joint. Ultrasound tests of joints. 15m
        Speaker: Paolo Fessia
        see presentation postes in next slot
      • 3:00 PM
        Stresses on busbar joints. 15m
        Speaker: Paolo Fessia
        Slides
      • 3:15 PM
        QPS commissioning plan. Quality assurance during the installation of the new quench detection systems. 15m
        Speaker: Fabio Formenti
      • 3:30 PM
        Schedule foreseen for the completion of the new Enhanced QPS system 20m
        Speaker: Fabio Formenti
      • 3:50 PM
        How does standard component failure effect the operation of the QPS? In particular, what will happen in case of a mains power loss? Does the system rely on the proper functioning of a UPS system? Is the redundancy system properly designed on all levels? 20m
        Speaker: Knud Dahlerup-Petersen
        Slides
      • 4:10 PM
        coffee break 20m
      • 4:30 PM
        Reserve 30m
    • 5:00 PM 6:00 PM
      Executive Session 30/5-039

      30/5-039

      CERN

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    • 8:00 PM 8:15 PM
      Dinner Auberge Communale de Meyrin 15m
    • 8:30 AM 5:00 PM
      Day reserved for follow-up questions and panel report preparation. 30/5-039

      30/5-039

      CERN

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    • 3:00 PM 4:00 PM
      Summary and preliminary recommendations 1h
      Speaker: Jay Theilacker
      Slides