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BOND & BOND-M Mechanical Structure
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Europe/Zurich
- Discussions on the conceptual design of the structure for long magnets:
- The concept of encapsulated bladders seems very useful to improve handling, bladder/shim positioning, bladder replacement and to absorb geometrical imperfections from the pad / yoke. However, it does not provide a solution for the interference key. In addition, the encapsulated bladder total height is relatively big (need of large slots in the structure).
- For the interference key, the team is in favour of a design without masters:
- Reducing the number of components is a great advantage towards industrialization.
- They are also not convinced that the lamination tolerances are worse than the own master tolerances.
- Furthermore, laminates (fine blanking) will be very similar in terms of geometry. The problem will be the jonction between modules.
- This is sort of confirmed with the experience we have preparing the MQXFB yoke-shell submodules. The key goes directly in contact with the laminations. We never found a problem to insert them.
- Perhaps the solution is instead to work on guaranteeing a good alignment between modules from the engineering design point of view.
- In this case, the structure should allow for enough margin in terms of clearance opening (We recall, for MQXFB we estimate a clearance of at least 300 microns).
- Test on active + passive bladders:
- Nico B. recovered the tooling for bladder testing from B.927.
- We will do a test next week using an active and passive (with a shim inside) bladders. The active bladder will be inflated to 400 Bar. Right after the passive bladder will be inflated to very low pressure. We will check if this allows to remove both bladders.
- With this test, we should understand if the proposal works or not (in first order). This will allow us to better define the next steps and to think on including this system in BOND's cross section (basically it will require a thinner encapsulation than originally, to make some space for the second bladder).
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