1. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Work partly supported by the EU FP7 HiLumi LHC grant agreement No. 284404 and by the US DOE through Brookhaven Science Associates, LLC under contract No. DE-AC02-98CH10886 with the US LHC Accelerator Research Program (LARP). This research used resources of the National Energy Research Scientific Computing Center, which is supported by the US DOE under contract No. DE-AC02-05CH11231. Double Quarter Wave Crab Cavity Helium Vessel Silvia Verdú-Andrés on behalf of the DQWCC team May 5, 2014

2. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Outline Conceptual design of the helium vessel and tuning system for the SPS DQWCC – Overview: dimensions, weight, He volume – Cavity stiffening, pre-tuning and tuning systems – Helium vessel and tuning system: assembly sequence, connections and interfaces, materials and joints Engineering studies – Pre-tuning and tuning range – Mechanical stresses – Thermal loads Summary 2

3. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 PoP helium vessel to introduce smoothly the conceptual design 3

4. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Cryo jumper Tuner + stiffening Adjacent beam pipe through the vessel beam FPC HOM 4 Helium vessel - concept Titanium Titanium and Niobium similar thermal expansion coefficient  rigid connections for all ports Piezo outside vessel  larger tuning range Prep rings for eventual disassembly All liquid helium – vacuum interfaces welded for best vacuum tightness Clearance to access to ports PU Ribs for additional stiffening Can CERN provide drawing of tuning system with piezo part?

5. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Pre-tuning and tuning systems 5 Combined function: tuning + stiffening H-field Tuning by actuation on the central plates E-field Silvia: PoP  SPS

6. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 6 Nicer cross-section to show pre-tuning with bolts to be fixed onto helium vessel top plate?? Pre-tuning system pre-tuning Pre-tuning ~ 1.6 MHz/mm (during assembly of cavity-vessel) for machining tolerances Put Qiong’s table with machining tolerances

7. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Tuning system 7 Symmetric actuation onto both central plates Can CERN provide drawing with piezo location??? tuning Tuning (after installation) push-pull ~ 1.6 MHz/mm (during operation) piezo ~ 30  m for Lorentz detuning and microphonics

8. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Lorentz detuning 8 Lorentz detuning: 0.17 Hz/ (10J) – best case scenario E-fieldH-field Fixed all ports and central plates (best case scenario)

9. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 9 Combined function: tuning + stiffening on central plates Stiffening during cooling down and pressure changes All port connections are rigid but PU Stiffening for cavity and helium vessel Ribs Any additional stiffening for the cavity????

10. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Helium vessel - dimensions 10 660mm 470mm 390mm He capacity:?? Weight:?? Integration into cryomodule

11. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Cavity assembly 11 1

12. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Cavity assembly 12 1 316LN SS DN63CF Flanges for FPC and BP; others are NbTi SS flange, Nb tube, Ti ring/adaptor Ti brazed welded HOM: NbTi flange welded to Ti adaptor and Nb tube

13. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Tuning system assembly 13 1 2 Ti rod brazed welded

14. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Tuning system assembly 14 1 2 3 Ti housing brazed welded

15. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 15 1 2 3 4 Helium vessel assembly brazed welded Ti prep ring Ti prep ring Ti vessel Grade 2 titanium. Integrated section of adjacent beam pipe in which material?? Cryo tube in SS brazed to prep tube in Ti. SS – H ; Ti-V

16. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Helium – vacuum interfaces 16 All liquid helium – vacuum interfaces welded No flow! Find another word

17. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Cooling and heat-stationing 17 Helium chamber for HOM filter Heat-stationing for tuning frame Heat-stationing for tuning tube He

18. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Heat loads – tuning system Picture with temperature to show gradients Picture of simulation result 18 CERN: heat load for tuning system

19. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Total heat load 19 To be updated: Skaritka

20. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Mechanical stresses 1.Helium pressure 2.300 K  2K 3.Actuation of tuning system 20

21. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Mechanical stresses 1.Helium pressure 2.300 K  2K 3.Actuation of tuning system 21 Helium

22. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Mechanical stresses due to helium pressure Constrains (fixed boundaries, etc) Load(s) and number of cycles (if applies) Max. stress allowed Picture of mesh Picture of initial constrains and loads Picture of stress value and deformation arrows Design elements incorporated to counter-act load effects Young modulus and Poisson’s ratio 22

23. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Mechanical stresses 1.Helium pressure 2. 300 K  2K 3.Actuation of tuning system 23

24. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Mechanical stresses due to thermal contraction (300K  2K) Constrains (fixed boundaries, etc) Load(s) and number of cycles (if applies) Max. stress allowed Picture of mesh Picture of initial constrains and loads Picture of stress value and deformation arrows Design elements incorporated to counter-act load effects Thermal expansion coefficient for Niobium and Titanium, Young modulus and Poisson’s ratio 24

25. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Mechanical stresses 1.Helium pressure 2.300 K  2K 3.Actuation of tuning system 25

26. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Mechanical stresses due to tuning system actuation Constrains (fixed boundaries, etc) Load(s) and number of cycles (if applies) Max. stress allowed Picture of initial constrains and loads Picture of mesh Picture of stress value and deformation arrows Design elements incorporated to counter-act load effects Young modulus and Poisson’s ratio 26

27. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Integration into cryomodule 27  Tomorrow’s presentation by John Skaritka

28. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Summary Compact vessel for compact cavity Dedicated vessel design to: – minimize liquid helium leak chances (all helium-vacuum interfaces welded) – ease assembly, particularly the access to cavity ports – ease disassembly (prep rings) Robust vessel design?? Appropriate stiffening of the cavity provided by rigid connection of cavity ports to vessel and tuning system Manifold tuning : pre-tuning + push-pull + piezo Optimized design for reduced heat load ?? 28

29. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 BNL Sergey Belomestnykh, Ilan Ben-Zvi, John Skaritka, Silvia Verdú-Andrés, Binping Xiao, Qiong Wu CERN Luis Alberty, Rama Calaga, Ofelia Capatina, Federico Carra, Giuseppe Foffano, Norbert Kuder, Raphael Leuxe, Thierry Renaglia SLAC Zenghai Li 29

30. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Thanks for your attention 30 Long Island Blue Claw Crabs

31. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Cavity mounting 31

32. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 32

33. HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014 Integration into cryomodule 33