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SPL Intercavity support

This document presents a comprehensive review of the conceptual design for a helium tank inter-cavity support system, aimed at addressing mechanical stability under cryogenic conditions. It outlines the requirements for load sustainability, alignment maintenance, and thermal contraction considerations. The proposed design includes innovative support schemes to ensure minimal stress on the helium tank while allowing free movement for thermal expansion. Key aspects such as installation, accessibility, and the overall structural integrity of the system are thoroughly analyzed.

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SPL Intercavity support

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  1. SPL Intercavity support Conceptual design review A. Vande Craen TE/MSC-CMI

  2. A. Vande Craen TE/MSC-CMI Summary • Introduction • Requirements • Concept scheme • Conceptual design • Proposed design • Conclusion

  3. A. Vande Craen TE/MSC-CMI Introduction • Helium tank/double walled tube not stiff enough for cantilever  Support on tuner side • Easiest way : connect on next cavity • Require special design: • Cryogenic temperature • Vacuum • Thermal contraction

  4. A. Vande Craen TE/MSC-CMI Summary • Introduction • Requirements • Concept scheme • Conceptual design • Proposed design • Conclusion

  5. A. Vande Craen TE/MSC-CMI Requirements • Mechanical aspect • Sustain any load case (static, transport, thermal transient…) • Allow alignment • Keep alignment in steady state (warm  cold) • Minimum stress in helium tank • Cryogenic temperature • Designed to work at 2K (transient) • Allow contraction of helium tank • Installation and access • Installation out of clean room • Accessibility to tune alignment • No accessibility required after alignment

  6. A. Vande Craen TE/MSC-CMI Summary • Introduction • Requirements • Concept scheme • Conceptual design • Proposed design • Conclusion

  7. A. Vande Craen TE/MSC-CMI Concept scheme Double walled tube Helium tank Inter-cavity support • Ideal • Low degree of hyperstaticity • Can be used in both plane (vertical and horizontal) • Extremity of cavities • 2 supports needed Next cavity Free space for supports

  8. A. Vande Craen TE/MSC-CMI Concept scheme • Support in vertical plane • Free longitudinal contraction • No displacement in vertical direction • Free rotation Beam Axis Beam Axis

  9. A. Vande Craen TE/MSC-CMI Concept scheme • Support in horizontal plane • Free transversal contraction (transient) • Blocked transversal displacement of cavity • Free rotation Beam Axis Beam Axis

  10. A. Vande Craen TE/MSC-CMI Concept scheme • Space available 34 mm

  11. A. Vande Craen TE/MSC-CMI Concept scheme Beam Axis Beam Axis Beam Axis Beam Axis

  12. A. Vande Craen TE/MSC-CMI Summary • Introduction • Requirements • Concept scheme • Conceptual design • Proposed design • Conclusion

  13. A. Vande Craen TE/MSC-CMI Conceptual design • Contacts • Sphere-cylinder • 1 free sliding, 2 blocked • Free rotation • Sphere-plane • 2 free sliding, 1 blocked • Free rotation • Redundancy • Limit maximum displacement

  14. A. Vande Craen TE/MSC-CMI Conceptual design • Thermal contraction • Longitudinal • 4.5 mm • Transversal • 1.15 mm • Max displacement of beam axis = 0.6 mm (transient)  deformation of helium tank • Vertical • 1.2 mm • Blocked  deformation of helium tank

  15. A. Vande Craen TE/MSC-CMI Conceptual design • Deformation • Alignment process not yet defined • Possible procedure • Alignment on a structure (supports not loaded) • Load transfer to vacuum vessel (supports loaded) • Alignment directly depends on supports  Limit deformations when loaded

  16. A. Vande Craen TE/MSC-CMI Conceptual design • Deformation • Steady state • Displacement allowed : 0.02 mm 10% of alignment tolerance • Load : 500 N 1/4 of total weight (200 kg) • Length : 250 mm • Transport • Displacement allowed : 0.1 mm • Load : 1540 N (0.5 g)

  17. A. Vande Craen TE/MSC-CMI Conceptual design • Cylinder Minimum diameter = 67 mm • Rectangle • Triangle

  18. A. Vande Craen TE/MSC-CMI Summary • Introduction • Requirements • Concept scheme • Conceptual design • Proposed design • Conclusion

  19. A. Vande Craen TE/MSC-CMI Proposed design • Contacts • Sphere-cylinder and sphere plane • Non standard components • High stresses at contact point • Sphere-cylinder : 430 Mpa • Sphere-plane : 1300 MPa  Plastic deformation • Solutions • Decrease stresses • Increase elastic limit

  20. A. Vande Craen TE/MSC-CMI Proposed design • Proposed solution • Spherical plain bearing • Rotation freedom (= sphere-sphere contact) • Standard components • Support very high load • Bad thermal contact • Sliding cylinder in spherical plain bearing • Cylinder-cylinder contact  low stresses • Easy to machine with standard tooling • Bad thermal contact Has to be tested at low temperature under vacuum

  21. A. Vande Craen TE/MSC-CMI Proposed design • Proposed solution • Sphere-cylinder • Cylinder sliding in a spherical plain bearing • Spherical plain bearing sliding in a cylinder Cylinder Spherical plain bearing

  22. A. Vande Craen TE/MSC-CMI Proposed design • Proposed solution • Sphere-plane • Spherical plain bearing sliding (on longitudinal and lateral axis) on a support • Cylinder sliding in a spherical plain bearing; spherical plain bearing sliding laterally on a support

  23. A. Vande Craen TE/MSC-CMI Proposed design • Proposed solution

  24. A. Vande Craen TE/MSC-CMI Summary • Introduction • Requirements • Concept scheme • Conceptual design • Proposed design • Conclusion

  25. A. Vande Craen TE/MSC-CMI Conclusion • Concept scheme and design • Acceptable stresses • Limited displacement • Next step • Test spherical plain bearing solution • Displacement • Friction • Define interface to helium tank • Design final solution

  26. A. Vande Craen TE/MSC-CMI Thank you for your attention

  27. A. Vande Craen TE/MSC-CMI Conceptual design • Reaction forces • Weight of the cavity • 200 kg • Acceleration during transport (0.5 g) • Max lateral force = 525 N • Max vertical force = 1540 N • Helium tank deformation (transient) • Vertical • Horizontal • Redundancy • Helium tank never in cantilever • Each support  All forces

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