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Update on BGV Mechanics

Update on BGV Mechanics. Ray Veness For the design team. Contents. Updated geometry and production process Window-tube transition Comparison with LHCb VELO window Conclusions. Detector Vacuum Geometry (post-discussion with MME Workshop). ~500 mm. 58 ID, 60 OD tube. 46? ID tube.

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Update on BGV Mechanics

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  1. Update on BGV Mechanics Ray Veness For the design team

  2. Contents • Updated geometry and production process • Window-tube transition • Comparison with LHCb VELO window • Conclusions

  3. Detector Vacuum Geometry (post-discussion with MME Workshop) ~500 mm 58 ID, 60 ODtube 46? ID tube Long conicalDN212-46 transition with DN235 and DN100 flanges 1100 mm Weld here 3100 mm Making the first part of the tube from the machined block, then increasing diameter to 60 OD would allow use of existing tooling Workshop concerned about fragility of this transition Workshop seem to prefer this single ‘sheet metal work’ solution

  4. Window-Tube Transition • FE Analysis • Re-analysis of the 45°transition shows that some reduction of thickness is possible • At the outer radius, some reduction from the 3.49 mm thickness should be achievable • For the 0.75 mm thickness at the inner radius the FE also shows that some reduction is possible, but the issue is more complex • Is this a good idea? • MME workshop expressed concern about the fragility of this transition already at 0.75mm • Comparison with similar installed chamber in LHCb confirms that this is already ambitious for a safe LHC installation (See pictures)

  5. LHCb VELO Window

  6. Conclusions • Discussions with Workshop • Suggested enlarging forward tube to speed-up production • Production in-house seems feasible, but we are already late with the schedule (we know this…) • Thickness of the window-tube transition • Despite FE analysis, window thickness should not be reduced as this is already on the limit of fragility • 75° transition is therefore better from a mechanical perspective • For the 45° option, we could imagine to decrease the thickness at large radii • Drawing and design • We must converge on a window opening angle an tube aperture before real design can start • Other work in progress • Discussions with bi-metallic flange supplier to reduce cost and risk of leak in the supplied components – now waiting for a new offer

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