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5-m long block: Conceptual design update (II)
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Europe/Zurich
§Magnet dimensions:
§(Herve) It would be nice to align with the available cradle sizes. In this way, we are ready whenever we decide to put a SS-vessel around. Two options:
§SS-shell OD = 495 mm
§SS-shell OD = 570 mm (dipole)
§(Herve) Considering a 10 mm thick shell, this gives:
§Magnet OD (Al-shell) = 475 mm
§Magnet OD (Al-shell) = 550 mm
§Action item: Shall we go for 550 mm OD?
§(Herve) MQXFA physical length is 4.5 m (without endplates) and fits in CLUSTER-D
§Action item: Check drawings for MQXFA, the 5-m long block should be very similar
§(Nico B) We have the integration of MQXFS in Cluster D.
§Action item: We can use it and scale accordingly, to account for the space needed for leads / magnetic measurement shaft (in case it is there), etc
§Can we live without masters for long magnets?
§N. Bourcey – We can imagine a sort of master just around the bladder (a casing), which makes the job of master without including it in the mechanical structure. It would be enough to design the proper grooves in the pieces.
§Action item: We will discuss together with Stephane
§Can we imagine something more innovative for the structure at a second stage?
§If we imagine SS-vessel around on which we weld an end-system, we would like to do the magnet loading with the SS vessel around.
§This could be tested in a MQXFS magnet (welded shell + end-system)
§Bladders:
§The vertical bladder is in a very tricky position in the split-yoke. We need enough slip-shim thickness to avoid problems. We could consider this casing solution. The bladder is very small, we would need a bit more of surface.
§Action item: Since we can adapt the size of the bladder from the production point of view, we will perform some ANSYS iterations on trying to find an optimum bladder width.
§Action item: Check what to do for protecting the bladder (linked to previous slidem, we would need a groove in the pad).
§Action item: Check with Stephane and MQXFB drawings the piling-up of layers and required dimensions (slip-shim, groove, bladder thickness, etc)
§Structure:
§MQXF experience showed us that the combination of azimuthal and axial force in the ends is important to keep the head well supported.
§With this in mind, making the last shell smaller may go in the wrong direction.
§Action item: Check results numerically on how the head is constrained for both cases (small shell and a full-length extremity one)
§The gain during CD in the rods seems very large. I have the impression that since we’re bonded to the wedge and with large pre-load the force does not reach the coil block on top.
§Action item: I will try to prove it with a frictionless model. Also check FRESCA2 results.
§Cooling:
§There is not much space for He-cooling compared to MQXF for instance.
§Action item: We will be based on the work from BOND
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§Protection:
§We need to take a quick look for protection. At the beginning we will (most likely) need to include non-impregnated quench-heaters. Note that space is there in the coil cross-section already today.
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§Handling:
§The magnet is dense and full of iron. The weight might be high, and everything is just kept by the keys in combination with the large force and friction.
§We expect that this force is orders of magnitude larger than the weight. But it is worth to cross-check and add it to the slides.
§When turning to vertical, we need to handle the shear that will appear.
§Action item: We can check what it is done in MQXFA in terms of tooling
§
§Instrumentation:
§It would be nice to instrument the bullets/pushers to better understand how the axial force is distributed.
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