HiLumi-LHC/LARP Crab Cavity System External Review – May Work partly supported by the EU FP7 HiLumi LHC grant agreement No 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-AC02-05CH Double Quarter Wave Crab Cavity Helium Vessel Silvia Verdú-Andrés on behalf of the DQWCC team May 5, 2014

HiLumi-LHC/LARP Crab Cavity System External Review – May 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

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

HiLumi-LHC/LARP Crab Cavity System External Review – May 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?

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

HiLumi-LHC/LARP Crab Cavity System External Review – May 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

HiLumi-LHC/LARP Crab Cavity System External Review – May 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

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

HiLumi-LHC/LARP Crab Cavity System External Review – May 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????

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

HiLumi-LHC/LARP Crab Cavity System External Review – May Cavity assembly 11 1

HiLumi-LHC/LARP Crab Cavity System External Review – May Cavity assembly LN 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

HiLumi-LHC/LARP Crab Cavity System External Review – May Tuning system assembly Ti rod brazed welded

HiLumi-LHC/LARP Crab Cavity System External Review – May Tuning system assembly Ti housing brazed welded

HiLumi-LHC/LARP Crab Cavity System External Review – May 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

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

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

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

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

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

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

HiLumi-LHC/LARP Crab Cavity System External Review – May 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

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

HiLumi-LHC/LARP Crab Cavity System External Review – May 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

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

HiLumi-LHC/LARP Crab Cavity System External Review – May 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

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

HiLumi-LHC/LARP Crab Cavity System External Review – May 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

HiLumi-LHC/LARP Crab Cavity System External Review – May 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

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

HiLumi-LHC/LARP Crab Cavity System External Review – May Cavity mounting 31

HiLumi-LHC/LARP Crab Cavity System External Review – May

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