HL-LHC BGI - magnet design update

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865/2-C19 (CERN)

865/2-C19

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Chiara Pasquino (CERN), Gunn Khatri (CERN), James Storey (CERN)
HL-LHC BGI meetings
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65961147691
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Gunn Khatri
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Present:

William, Dominique, Lauren, Gunn

Discussion

  • Introduction & Presentation

    • Dominique presented an overview of the BGI project and its magnet requirements.
    • The latest design and integration model for LHC Point 4, developed in CATIA by František, was shown.

  • Main Magnet Design

    • The new main magnet design has been optimized to be compatible with the existing power converters from the BBLR instrument (600A, 40V) and new DC cables.
    • The magnet and cable require 24V @ 490A, leaving a sufficient margin.

  • Recycling of MDX Magnets

    • The old MDX magnets will be repurposed as trim magnets, using existing power converters and cables (125A, 125V).
    • The magnet and cable require 37V @ 45A, also leaving a margin.

  • Magnet Design & Field Quality

    • The design has been fine-tuned for cost optimization by reusing existing power converters, achieving the best possible outcome.
    • The coil is circular, with tapered and rounded yoke ends to maximize field homogeneity (dB/B < 1E-3).
    • Magnetic field harmonic numbers were presented, requiring approval from the LHC beam optics team (BE-ABP, Riccardo?).
    • In particular, B3 harmonics appear relatively high, but their impact on the LHC beam is expected to be negligible.

  • Cost & Timeline

    • Preliminary cost estimates and procurement timeline were discussed (figures not yet finalized).
    • If the magnet design is approved by BE-ABP, the production plan will be:
      1. Manufacturing of one pre-series magnet.
      2. Followed by production of three additional magnets.
    • No spare magnet will be built; only spare coils will be ordered.

 

Action Items

  1. EPC & BBLR Team

    • Officially reserve the four existing power converters from BBLR.

  2. LHC Beam Optics Team (BE-ABP)

    • Verify that the field harmonics of the new magnet meet LHC beam requirements.

  3. BI-ML Team

    • Obtain the 3D model from František.
    • Begin working on the BGI instrument integration and support mechanics.

  4. Machine Protection Team (Jan Uthoven)

    • Update them on the latest magnet design.

  5. V-IPM Simulations

    • Run simulations using the latest B-field map.
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