Assembly Sequence
As the assembly is similar to other racetrack-type magnets, the sequence will follow the procedure described in Nicolas’ presentation.
In addition to this baseline sequence, dedicated handling tooling capable of rotating and lifting the coil in both orientations (aperture up and aperture down) shall be designed.
The following points still need to be clarified:
- Ground insulation (GI) design and installation (pending final definition of GI layers)
- Selection of the appropriate metrology system for coil measurements
Coil Lifting
If feasible, the coil lifting system should make use of the existing 927 multi-purpose beam.
Solution 2 (see slide 10) is selected as the baseline interface for coil lifting, as it:
- Avoids inserting any component into the aperture (unlike Solution 1)
- Minimizes modifications to the existing pole design (compared to Solution 3)
This configuration will first be validated using the copper coil before implementing any modifications to the component sets intended for Nb₃Sn coil production.
Impregnation Tooling
Threaded holes shall be added to the top of the impregnation filler parts (CNRMHFOST0244 or CNRMHFOST0245) to facilitate lifting of the impregnated coil.
To simplify coil-pack insertion, handling, and storage, the coil leads should be bent in the hard-way direction so that they are parallel to the aperture axis.
This requires modifications to:
- The leads clamping system during splicing operations
- The impregnation mold
- The brazing tooling
These changes may also impact the current design of the connection plate, as well as the associated lead forming and clamping tooling. This must be assessed using the 3D magnet assembly.
Coil Rotation Tooling
The coil rotation tooling should be compatible with the existing rotating table available in building 927. Compatibility must be verified, and any necessary adaptations identified, particularly with respect to the existing 11T Dipole or MCBXF rotating tables.
Coil Machining
The final coil width will be achieved by machining the lateral loading plates after impregnation.
Requirements:
- The coil must be symmetric with respect to the longitudinal axis defined by the centers of the dowel pin holes
- All coils shall be machined to the same nominal width (to be defined after completion of copper coil impregnation)
After geometric measurement, the coil will be mounted on a dedicated jig to align it with respect to its aperture. This jig will facilitate both transport and machining operations.
Wedge Width
The nominal wedge width is 178.3 mm, while the coil width is 178.56 mm.
Since the coil sides will be machined, the wedge may become flush with the coil. A final decision on whether to reduce the wedge width will be taken after completion and measurement of the copper coil.
