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SPL Intercavity support

SPL Intercavity support. Conceptual design review. Summary. Introduction Requirements Concept scheme Conceptual design Proposed design Conclusion. Introduction. Helium tank/double walled tube not stiff enough for cantilever  Support on tuner side Easiest way : connect on next cavity

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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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