1. SPL Intercavity support Conceptual design review 04/11/2011 1 A. Vande Craen TE/MSC-CMI

2. Summary Introduction Requirements Concept scheme Conceptual design Proposed design Conclusion 04/11/2011 2 A. Vande Craen TE/MSC-CMI

3. 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 04/11/2011 3 A. Vande Craen TE/MSC-CMI

4. Summary Introduction Requirements Concept scheme Conceptual design Proposed design Conclusion 04/11/2011 4 A. Vande Craen TE/MSC-CMI

5. 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 04/11/2011 5 A. Vande Craen TE/MSC-CMI

6. Summary Introduction Requirements Concept scheme Conceptual design Proposed design Conclusion 04/11/2011 6 A. Vande Craen TE/MSC-CMI

7. Concept scheme Ideal ▫Low degree of hyperstaticity ▫Can be used in both plane (vertical and horizontal) Extremity of cavities ▫2 supports needed 04/11/2011 7 Double walled tube Inter-cavity support Next cavity Free space for supports Helium tank A. Vande Craen TE/MSC-CMI

8. Concept scheme Support in vertical plane ▫Free longitudinal contraction ▫No displacement in vertical direction ▫Free rotation 04/11/2011 8 A. Vande Craen TE/MSC-CMI

9. Concept scheme Support in horizontal plane ▫Free transversal contraction (transient) ▫Blocked transversal displacement of cavity ▫Free rotation 04/11/2011 9 A. Vande Craen TE/MSC-CMI

10. Concept scheme Space available 04/11/2011 10 34 mm A. Vande Craen TE/MSC-CMI

11. Vertical supportHorizontal support Concept scheme 04/11/2011 11 A. Vande Craen TE/MSC-CMI

12. Summary Introduction Requirements Concept scheme Conceptual design Proposed design Conclusion 04/11/2011 12 A. Vande Craen TE/MSC-CMI

13. 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 04/11/2011 13 A. Vande Craen TE/MSC-CMI

14. 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 Conceptual design 04/11/2011 14 A. Vande Craen TE/MSC-CMI

15. 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 04/11/2011 15 A. Vande Craen TE/MSC-CMI

16. 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) 04/11/2011 16 A. Vande Craen TE/MSC-CMI

17. Conceptual design Cylinder Minimum diameter = 67 mm Rectangle Triangle 04/11/2011 17 Width [mm] Height [mm] 10106 1592 2084 2578 A. Vande Craen TE/MSC-CMI Width [mm] Height [mm] 10152 15132 20121 25112

18. Summary Introduction Requirements Concept scheme Conceptual design Proposed design Conclusion 04/11/2011 18 A. Vande Craen TE/MSC-CMI

19. 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 04/11/2011 19 A. Vande Craen TE/MSC-CMI

20. 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 04/11/2011 20 A. Vande Craen TE/MSC-CMI

21. Proposed solution ▫Sphere-cylinder  Cylinder sliding in a spherical plain bearing  Spherical plain bearing sliding in a cylinder Proposed design 04/11/2011 21 Spherical plain bearing Cylinder A. Vande Craen TE/MSC-CMI

22. 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 Proposed design 04/11/2011 22 A. Vande Craen TE/MSC-CMI

23. Proposed solution Proposed design 04/11/2011 23 A. Vande Craen TE/MSC-CMI

24. Summary Introduction Requirements Concept scheme Conceptual design Proposed design Conclusion 04/11/2011 24 A. Vande Craen TE/MSC-CMI

25. 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 Conclusion 04/11/2011 25 A. Vande Craen TE/MSC-CMI

26. 04/11/2011 26 A. Vande Craen TE/MSC-CMI

27. 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 Conceptual design 04/11/2011 27 A. Vande Craen TE/MSC-CMI