Meeting Details
Agenda Items and Notes
1. Progress of the 77 k and 4.2 K Measurement Design and Preparation
- 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.
2. Quick update on pre-compression tests and simulations benchmarking
- 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.
- Differences in mesh density between 2D and 3D are being considered.
- 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
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