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BOND design status - Update on racetrack mock-up results
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Europe/Zurich
927/1-B23 (CERN)
BOND design status
General update:
- Price enquiry for BOND order did not have an answer after 5 weeks (only low-developed countries) in the first run.
- 5 weeks lost
- New price enquiry launched again.
3D Engineering design:
- Connection box shall be compatible with CLUSTER-D in principle (To be checked if HFM will be equipped with the possibility of going above 20 kA)
- For Stainless steel we agree to go for SS316L (better than 304 in terms of magnetic). Note that 316LN would be tricky to machine.
- Wedge geometry on the sides compared with the coil: Designed as aligned, then we will shim
- On the wedge surface in contact with the coil, to make it sliding, shall we put some PTFE coating or just releasing agent?
- We go for PTFE coating
- For wedge tolerances (aperture radius) we use the same as the pole +/- 0.1 mm
- Wedge area in contact with the pole stopper - By design we target for a perfect match (no gaps)
- For wedge production, we introduce a stress relief treatment before final machining
- Interlayer:
- Option 1: CERAPREG interlayer (tests on-going at Polymer Lab). Nico L. is happy so far. To be tested in SMC302, hopefully tested before first BOND coil.
- Option 2: Standard fiber option, piling up several layers of S2-glass DESIZED. We need to make sure that we have enough glass and which thickness. Nico L. to follow this.
- In any case, try to avoid binder. And for the moment we do not plan any tool for this.
Mock-ups:
- See slides from Nico L.
- Tomography available already for the first mock-up
- Metallographic analysis on-going. Some results expected next week or in 2 weeks time
- Second mock-up wound and reacted with same parameters. This time reacted horizontally (not as the first one), same results as first one.
- Negligible impact from gravity. We can conclude that the tilt in the first reaction has a negligible impact in our observables.
- ACTION ITEMS:
- Contact Oscar and prepare a presentation wrapping-up all mock-up results in 2 weeks for now.
Other tooling:
- For Spring 2026, we would like to have developed the alternative measurement system (with the possibility of adding machine).
- Action item: For next meeting, Nico L. and Nico B. will communicate how they want to organize.
Components:
- MICA, S2-glass (including MICA with less silicone-gluant content) and other components / improvements to be procured by Nico L.
- Epoxy: In principle, CTD 101K for first coils. We should give Polymer Lab the volume we need per coil. We should order enough for 4+1 coils.
- Polyimide sheets for ground insulation. Make sure with Seb that there is enough in stock.
- FUJI Paper: To be checked what stock and date we have in stock.
Double aperture:
- Issue on yoke stresses and coil-pole pressure
- Check the corner issue with different mesh sizes.
- Explore further the 4-parts yoke
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