•       Presentation by N. Lusa (covered by J. Ferradas):

o   Reaction tooling mock-ups (N. Lusa):

§  First mock-up with cylindrical bar: Titanium baseplate cleaned, measured and sent for heat treatment. It will be back in B.180 today for re-measuring.

§  Racetrack mock-up: Drawings being finalized after comments from N. Peray. Procurement will be launched by P. Moyret, the machined parts should arrive at CERN on May 2025.

§  Flared-ends racetrack mock-up: Bejamin Pellet is starting to work on this.

o   N. Lusa is also looking for new MICA options for HFM:

§  Contacted COGEBI.

Up to now they always proposed to us epoxy compatible MICA. However, we do not strictly need this for the MICA in the reaction tooling.

The idea is to characterize in the chemical lab by TGA and FTIR the following samples:

·        Cogemica high-temp 730 0.2 mm (roll, the same used by LARP)

·        Cogefoil 504 0.2 mm

If successful, this could be tested in one of the following SMC coils for instance.

In addition N. Lusa also asked for 2 mm thick MICA foil epoxy compatible (as an option for BOND interlayer). Waiting for answer.

o   N. Lusa got in contact as well with various companies about Alumina / Silicat fabrics for thick layers. He has launched the procurement of some samples together with the Polymer Lab for characterization. This could be an option for very thick interlayers.

One of these companies is also proposing a product called Resbond 901A binder. We’re taking a look at it. 

o   Initiative to re-activate the idea of using Metrascan for long coil measurements.

•  Presentation by N. Peray:
  • Slide 3 - Include C-shape fiber on top and bottom of the coil to reinforce the insulation with the rail (reinforce the corners by wrapping around).
  • Slide 3 - Create space for fiber wrapping after splice (0.4 mm additional space accounting for 0.2 mm fiber with 50% overlap). This is done because after the splicing the fiber is damaged and we should consider replacing it.
  • Slide 3 - Transition between the blue rail part and the yello looks tricky. It is over the endshoe which is more rigid. DO NOT ALIGN DISCONTINUTIES. Nico to modify the geometry avoiding aligned discontinuities. The blue rail must be longer.
  • Slide 3 - Think in introducing an overlap in between the kapton lead insulation and the impregnated yellow part.
  • Slide 5 - Create a link between endshoe and pole. Check what we do in MQXF with the "regle".
  • Slide 6 - Endshoe kept in one piece. Note that layers are not aligned in the Lead side due to the layer jump geometry.
  • Slide 7 - Go for a solution with a pocker and a filler. Leads are free and not clamped during reaction (2 MICA layers for sliding)
  • Slide 9 - Rail up to the end on return side
  • Slide 11 - Take the pole as reference for overlength measurements
  • Slide 14 - We go for option 3 with fillers (could be teflon or coated parts). The top part in the ends could be indexed to the pole, always forcing the same geometry and just compensating in the straight section. We should consider as well an intermediate layer (tole) to create a good contact surface and finished geometry.

• ACTION ITEMS FOR JUAN:
  • Schedule a meeting with M. Guinchard's team for coil instrumentation, shell and rods. Also for displacement measurements during RHT.
  • Schedule a meeting with the US working group in order to show the tooling design by Nico.
  • Contact the Magnetic measurements' team to introduce the magnet design and discuss about measurement devices fitting in the aperture (Quench antennas, etc).

S