double quarter wave crab cavity helium vessel
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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 CavityHelium Vessel
Silvia Verdú-Andréson behalf of the DQWCC team
May 5, 2014
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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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
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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• PoP helium vessel to introduce smoothly the conceptual design
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Cryo jumper
Tuner +
stiffening
Adjacent beam pipe through the vessel
beam
FPC
HOM
HOM
Helium vessel - concept
• 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
PUPU
Ribs for additional stiffening
Can CERN provide drawing of tuning system with piezo part?
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Pre-tuning and tuning systems
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 5-6 2014
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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 5-6 2014
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Tuning system
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 mmfor Lorentz detuning and microphonics
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Lorentz detuning
Lorentz detuning: 0.17 Hz/ (10J) – best case scenario
E-field H-field
Fixed all ports and central plates (best case scenario)
𝑃=14 (−𝜀0|�⃗�|2+𝜇0|⃗𝐻|2)
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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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 5-6 2014
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Helium vessel - dimensions
660mm
470mm
390m
m
He capacity: ??Weight: ??
Integration into cryomodule
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Cavity assembly1
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Cavity assembly1 316LN SS
DN63CFFlanges for FPC and BP; others are NbTi
SS flange, Nb tube, Ti ring/adaptor
Ti
brazedwelded
HOM: NbTi flange welded to Ti adaptor and Nb tube
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Tuning system assembly1 2
Ti rod
brazedwelded
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Tuning system assembly1 2
3Ti
housing
brazedwelded
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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1
2
3
4
Helium vessel assembly
brazedwelded
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 5-6 2014
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Helium – vacuum interfaces
• All liquid helium – vacuum interfaces welded
No flow! Find another word
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Cooling and heat-stationing
Helium chamberfor HOM filter
Heat-stationing for tuning frame
Heat-stationing for tuning tube
He
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Heat loads – tuning system • Picture with temperature to show gradients• Picture of simulation result
CERN: heat load for tuning system
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Total heat load
To be updated: Skaritka
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Mechanical stresses1. Helium pressure2. 300 K 2K3. Actuation of tuning system
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Mechanical stresses1. Helium pressure2. 300 K 2K3. Actuation of tuning system
Helium
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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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
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Mechanical stresses1. Helium pressure2. 300 K 2K3. Actuation of tuning system
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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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
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Mechanical stresses1. Helium pressure2. 300 K 2K3. Actuation of tuning system
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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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
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Integration into cryomodule
Tomorrow’s presentation by John Skaritka
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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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??
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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BNLSergey Belomestnykh, Ilan Ben-Zvi, John Skaritka, Silvia Verdú-Andrés, Binping Xiao, Qiong Wu
CERNLuis Alberty, Rama Calaga, Ofelia Capatina, Federico Carra, Giuseppe Foffano, Norbert Kuder, Raphael Leuxe, Thierry Renaglia
SLACZenghai Li
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Thanks for your attention
Long Island Blue Claw Crabs
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Cavity mounting
HiLumi-LHC/LARP Crab Cavity System External Review – May 5-6 2014
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Integration into cryomodule
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