Double Quarter Wave Crab Cavity Helium Vessel Silvia
Double Quarter Wave Crab Cavity Helium Vessel Silvia Verdú-Andrés on behalf of the DQWCC team May 5, 2014 Work partly supported by the EU FP 7 Hi. Lumi LHC grant agreement No. 284404 and by the US DOE through Brookhaven Science Associates, LLC under contract No. DE-AC 02 -98 CH 10886 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-AC 02 -05 CH 11231. Hi. Lumi-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 Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 2
• Po. P helium vessel to introduce smoothly the conceptual design Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 3
Helium vessel - concept Ribs for additional stiffening Cryo jumper HOM FPC Can CERN provide drawing of PU PU tuning system with piezo part? • • • 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 Adjacent beam pipe through the vessel beam HOM Tuner + stiffening Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 4
Pre-tuning and tuning systems E-field H-field Tuning by actuation on the central plates Silvia: Po. P SPS Combined function: tuning + stiffening Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 5
Pre-tuning system • Pre-tuning Nicer cross-section to show pre-tuning with bolts to be fixed onto helium vessel top plate? ? ~ 1. 6 MHz/mm (during assembly of cavity-vessel) for machining tolerances Put Qiong’s table with machining tolerances pre-tuning Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 6
Tuning system • Tuning push-pull ~ 1. 6 MHz/mm (during operation) piezo ~ 30 mm (after installation) for Lorentz detuning and microphonics Can CERN provide drawing with piezo location? ? ? Symmetric actuation onto both central plates tuning Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 7
Lorentz detuning E-field Fixed all ports and central plates H-field (best case scenario) Lorentz detuning: 0. 17 Hz/ (10 J) – best case scenario Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 8
Stiffening for cavity and helium vessel All port connections are rigid but PU Ribs Any additional stiffening for the cavity? ? Stiffening during cooling down and pressure changes Combined function: tuning + stiffening on central plates Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 9
Helium vessel - dimensions ? ? Weight: ? ? 390 mm He capacity: m m 70 4 660 mm Integration into cryomodule Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 10
Cavity assembly 1 Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 11
HOM: Nb. Ti flange welded to Ti adaptor and Nb tube Cavity assembly 1 316 LN SS DN 63 CF Flanges for FPC and BP; others are Nb. Ti SS flange, Nb tube, Ti ring/adaptor Ti brazed welded Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 12
Tuning system assembly Ti rod 1 2 brazed welded Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 13
Tuning system assembly 1 2 3 Ti housing brazed welded Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 14
Helium vessel assembly. Grade 2 titanium. Cryo tube in SS brazed to prep tube in Ti. SS – H ; Ti-V Ti prep ring 4 2 Ti vessel 1 brazed welded Integrated section of adjacent beam pipe in which material? ? Ti prep ring 3 Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 15
Helium – vacuum interfaces No flow! Find another w • All liquid helium – vacuum interfaces welded Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 16
Cooling and heat-stationing Heat-stationing for tuning frame Heat-stationing for tuning tube Helium chamber for HOM filter He Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 17
Heat loads – tuning system • Picture with temperature to show gradients • Picture of simulation result CERN: heat load for tuning system Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 18
Total heat load To be updated: Skaritka Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 19
Mechanical stresses 1. Helium pressure 2. 300 K 2 K 3. Actuation of tuning system Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 20
Mechanical stresses 1. Helium pressure 2. 300 K 2 K 3. Actuation of tuning system Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 Helium 21
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 Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 22
Mechanical stresses 1. Helium pressure 2. 300 K 2 K 3. Actuation of tuning system Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 23
Mechanical stresses due to thermal contraction (300 K 2 K) • • 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 Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 24
Mechanical stresses 1. Helium pressure 2. 300 K 2 K 3. Actuation of tuning system Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 25
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 Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 26
Integration into cryomodule Tomorrow’s presentation by John Skaritka Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 27
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? ? Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 28
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 Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 29
Long Island Blue Claw Crabs Thanks for your attention Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 30
Cavity mounting Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 31
Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 32
Integration into cryomodule Hi. Lumi-LHC/LARP Crab Cavity System External Review – May 5 -6 2014 33
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