BOND design status - Update on racetrack mock-up results

Tuesday 19 Aug 2025, 10:30 → 12:05 Europe/Zurich

927/1-B23 (CERN)

10:30 → 10:50 Update on Racetrack RHT results

Speaker: Nicholas Lusa (CERN)

10:50 → 11:20 Status on tooling and mechanical structure design

Speakers: Matthieu Canale (Universite de Savoie Mont-Blanc (FR)), Nicolas Peray

11:20 → 11:40 BOND design status

Speaker: Jose Ferradas Troitino (CERN)

11:40 → 12:00 AOB

Speakers: Elena Fernandez Mora (CERN), all

N. Lusa updates:

• First mock-up impregnated early August; demolding scheduled this week.

• Modifications on certain parts of the mock-up completed.

• Winding of the second mock-up planned to start Thursday with Carlos; if not finished, will continue Friday with Elena depending on her availability with RMM activities.

• Heat treatment to be performed in GERO 700 furnace.

 

N. Peray updates:

• A dedicated fabrication folder needs to be created in the EOS server, under the SMT laboratory space, within the BOND project.

• Production of sarcophagus, reaction guiding table, and lifting tool launched on 18/08/2025.
• Matthieu included the optical fiber in the coil CAD model to visualize its integration. Nico will review it and follow up with M. Guinchard’s team.

• The team also discussed coil details: V-tap positioning is under review, based on a schematic previously shared by Jose. For the head spacer pocket, a reduction is possible on one side but not on the other due to the impregnated wedge. The current design foresees a 3 mm pocket height, which still needs to be verified against all wire configurations to ensure compatibility and sealing of the trace wire connection.

• Matthieu has prepared the tooling design for coil rotation (wheel). 
• Several aspects remain to be clarified, such as the full assembly and lifting sequences, the method to turn the coil safely, and the availability of the lifting beam (palonnier).
• Nico is progressing on the transition between the reaction mold and the impregnation mold. A key point raised is to avoid supporting the coils on wheels during this step, and instead place them directly on the bottom part of the impregnation mold.
• Ground insulation was also highlighted as a critical topic, since it impacts both the mounting and lifting sequences. Elena questioned whether a dedicated tooling should be developed for folding the ground insulation. Nico has already identified a company that could take on this task, but the team agreed that further reflection is required before moving forward.
• Nico also advanced on filler pieces for the impregnation mold.

• Longitudinal constraint and rods definition still pending.

• Interface with bladders and keys pumping station need to be studied.

• The splicing tooling drawing needs to be checked, and its fabrication will be carried out internally.

 

A. Haziot updates:

• Double-aperture magnet: dimensional incompatibility between the outer diameter and the cryostat.

• Gap of 20 mm adopted to improve harmonics.

• Yoke design under discussion:

  • 4-piece solution likely unsuitable.

  • 2-piece yoke still under study.

  • Options include reinforcing the global shape or relaxing corner shear stresses.

• Geometry refinement ongoing; first results considered encouraging.