Final Cooling Solenoid - Progress Meeting

Name: Final Cooling Solenoid - Progress Meeting
Start: 2026-03-27T14:00:00+01:00
End: 2026-03-27T16:00:00+01:00
Location: CERN

Friday 27 Mar 2026, 14:00 → 16:00 Europe/Zurich

376/1-020 (CERN)

63807523337

Carlotta Accettura

Raphael Unterrainer

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Meeting Details

In Attendance: @Agnieszka Chmielinska, @Arjan Verweij, @Audrey Jade Ventura, @Bernardo Bordini, @Frantisek Sanda, @Jorge Guardia Valenzuela, @Konstantin Weindel, @Raphael Unterrainer, @Tim Mulder

A new design has been completed, compatible with configurations from one up to multiple pancakes.
The setup should function for SM18, 163, and Grenoble (although the outer wings may not be suitable for the latter).
Features include:

Outer connection for backup current injection.
Holes for sensor insertion (e.g., spring pins) at both the top and bottom.
Accommodation for 10 coils would result in a total assembly height of approximately 14 cm.
Additional holes integrated to support cabling and general access points.

The current injection component must be produced according to the requirements of each testing facility.
A meeting with Gérard and Franco at SM18 confirmed that the SM18 setup is expected to be ready by end of May. Testing at 20 K will also be possible there, not only at 4.2 K.
Production with @Jorge Guardia Valenzuela, targeting end of April for completion.
For the 77 K configuration, one hole in the copper blocks used for current injection is still missing.

The 2D model has been modified to include the mounting structure, leading to strain values now in the same order of magnitude as measured ones.
The 3D model (CAD model used for production) has been implemented in simulations. It includes all grooves and structural features present in the manufactured parts.
The 2D and 3D models show differing strain vs displacement behavior; the cause of this discrepancy is under investigation.
Work is ongoing on a simplified 3D model (closer to the 2D model) to reduce variable complexity and identify key influencing factors.

In the 2D simulations, bending/buckling of the pancake at the inner radius and lift off from the mount plate are observed. These effects should be verified experimentally.

Current simulations assume a frictionless contact between the coil and mount plate.

A Simulation Meeting is scheduled for April 3, 2026: Final Cooling Solenoid - Simulations Meeting (April 3, 2026) · Indico

3. Progress and open tasks for the test in Grenoble

Test slot: October 6–12, 2026.
Simulations with NICQS under external field conditions indicate that a 10 minute ramp up results in internal forces reaching up to 1 MN. A corresponding mechanical simulation is required, and additional internal support may be needed.
The coil charging process lasts roughly ten times longer than the magnet ramp up, therefore charging must be completed in advance.
Discussion ongoing regarding surface polishing.
Priority: Run the mechanical stress simulation; adapt the joint terminal design based on results

Coil for microscopy and one for @Oscar Sacristan De Frutos have been produced and delivered.

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