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HQ video meeting - February 5, 2014. HQ02b Test Goals, Organization and Schedule. GianLuca Sabbi. HQ Schedule. HQ02b Test Goals. Complete quench training at 1.9K (defined criteria to stop in case of slow progress) Assess performance improvements/degradation with higher pre-load

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HQ02b Test Goals

  • Complete quench training at 1.9K (defined criteria to stop in case of slow progress)
    • Assess performance improvements/degradation with higher pre-load
    • Include additional measurements of quench propagation
    • Assess performance of CLIQ system for magnet protection
      • Wish list includes provoked, natural and reference quenches
      • Opportunities for optimization are being discussed
  • Study of quench protection limits
    • MIITS budget before start of permanent degradation
    • Additional degradation down to minimum performance requirements
  • Additional goals:
  • Incorporate/characterize new instrumentation (QA, acoustics etc.)
  • Demonstrate/validate methods to incorporate magnetic shims
  • Not included in this test:
  • Robustness studies: large number of cycles, full accelerator cycle
  • Cold magnetic measurements (warm measurements are included)

HQ02b Test Organization

  • Three weeks of cold testing allocated at the CERN test facility
    • Start in mid-March (to be confirmed)
    • Aiming to deliver magnet at least 2 weeks in advance
  • Test jointly managed by CERN and LARP
    • LARP is in charge of ensuring that the test plan is consistent with the HQ goals and priorities.
    • CERN is in charge of the test operations and to proceed, postpone or cancel planned measurements based on safety considerations and the availability of resources and infrastructure
  • Coordinators: H. Bajas (CERN), G. Sabbi (LARP)
  • Progress discussions will be arranged at the end of each testing day, to summarize results and plan for the next day
  • Update emails to the HQ list and broader meetings to discuss intermediate results and next steps will be arranged as needed.
  • Under discussion: mechanisms for distributing test results to the collaboration

Considerations for Test Plan Review

  • Quench antenna, acoustic sensors and magnetic shims:
    • Prepare for HQ03 and (long) QXF
    • Minimize interference with the main test goals
  • Test plan optimization:
  • Use of data from previous tests to improve efficiency
    • Use HQ02a settings for ramping and detection/protection
    • Use HQ02a quench data as a reference for CLIQ
    • Need to check reproducibility with CERN/FNAL setup
  • Address multiple test goals with the same measurements
    • Combine CLIQ studies with training quenches
    • Combine CLIQ studies with protection limits study

Scenarios for high MIITs Quenches

  • Current plan assumes that HQ02b will achieve short sample limit at 4.5K
    • Intent of pre-load increase is to allow faster training and minimize detraining – without performance degradation
    • This should allow to characterize degradation vs MIITs at 4.5K
  • Alternative scenarios to consider:
    • Performance degradation (with quenches at the pole or mid-plane)
    • Different quench mechanism at 4.5K and 1.9K
  • We don’t know what is the “best” scenario (the most relevant to QXF)
  • Need to take into account the most efficient settings for high MIITs and control quenches from the cryogenics standpoint
  • Need to decide what is the best approach to increase MIITs in a well-controlled and efficient way (a proposal will be presented)
  • Not a standard test and pushing the limits: carefully consider performance and safety issues for both facility and magnet