draft !

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.