parallel-bar prototyping status
DESCRIPTION
LHC-CC 11, CERN. 14-15 Nov ember 2011. PARALLEL-BAR PROTOTYPING STATUS. JLab 11 GeV Deflector. Cavity Drawing. FABRICATION OVERVIEW. Fabrication Procedure. OFC copper unit will be fabricated before Niobium cavity. Components forming and machining - PowerPoint PPT PresentationTRANSCRIPT
Page 1
Jean Delayen
Center for Accelerator ScienceOld Dominion University
andThomas Jefferson National Accelerator Facility
PARALLEL-BARPROTOTYPING STATUS
LHC-CC 11, CERN 14-15 November 2011
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JLab 11 GeV Deflector
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Cavity Drawing
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Cavity Assembly(Tuning before
weld)
Body Weldment
Cavity Shoulders
Cavity shoulder machining
Center Shell Weldment
Forming/Machining
End Cap Weldments
End Cap Forming/Machinin
g Beam Pipes/Ports
Beam Pipe Rolling/Machining Flange Machining
FABRICATION OVERVIEW
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OFC copper unit will be fabricated before Niobium cavity.• Components forming and machining
Each components will have longitudinal margin for tuning and welding • Sub-assembly e-beam welding
All weld seams are full thickness butt weld, weld parameter study done• Warm tuning
Initial measurement of frequency before welding• Sub-assembly BCP
Currently BCP is preferred. JLAB BCP supports 80-100 mT gradient• Assembly welding• Frequency measurements before and after vacuum load• Stiffener welding• Frequency measurements before and after vacuum load • Final BCP and high pressure rinse
• Electro polish is also considered
Fabrication Procedure
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Center shell forming(Die cross section)
Center shell machiningWeld margin included
EBW seams: 40% pre-pass, 50kV 48mAmp 6 in/min beam speedWelding will be both sides to ensure the smooth surface inside
Machined cavity shoulder Welding cavity shoulder and center shell
Body Weldment
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End cap side Center shell side
Transition blockAluminum trial part shown
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End cap forming
Machining(Weld and tuning margin included)
Machining port openings Welding beam port and coupler ports
End Cap Weldment
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Beam pipes and coupler ports are made.Blank flanges are not shown.
Pipe ends need to be machined before welding.
Al-Mg gaskets for final assembly. For tunings and measurements Indium seal will be used.
Niobium beam ports with Nb-Ti flanges
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Multi step frequency measurements to compare with the analyses
1. Warm Tuning before Final Weld
2. Frequency measurement after final weld3. Evacuate and measure frequency4. Weld stiffeners5. Evacuate and measure frequency6. Final BCP and high pressure rinse
Frequency Measurements
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LHC Crab Cavity (ODU/Niowave)
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LHC Crab Cavity
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Cavity Assembly
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Cavity Parts
• Mechanical design of the end plates with flanges is finished and the parts of this subassembly are manufactured
• Outer conductor forming design is in progress
NIOWAVEwww.niowaveinc.com
400 MHz LHC Crab Cavity Parts in Production (1)
• Copper prototype of the end plates was stamped
• And the nipples were pulled
NIOWAVEwww.niowaveinc.com
400 MHz LHC Crab CavityParts in Production (2)
• Beam and side port pipes are brazed with the stainless steel conflat flanges
• Both of the Nb end plates were stamped and nipples were pulled
• The preparation for the welding of the brazed beam pipes and side ports pipes is underway
• The OC parts and dies are in production
NIOWAVEwww.niowaveinc.com
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400 MHz LHC Crab CavityParts in Production (3)
NIOWAVEwww.niowaveinc.com
LHC Crab Cavity Schedule• Complete EB Welding of End Caps with beam ans side ports
– November 8th, 2011 • Welding Fixture for the Outer Conductor manufacture
– November 21st, 2011 • Complete OC fabrication
– November 28th, 2011 • Complete Cavity Fabrication (Welding of End-plates with OC)
– December 12th, 2011 • Welded Cavity leak checking and inspection
– December 19th, 2011• Flash Cavity Etch (~20 m)
– December 21st, 2011• Stiffening Ribs design and fabrication
– January 31st, 2012
NIOWAVEwww.niowaveinc.com
LHC Crab Cavity Schedule2012
Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul
Design PhaseCrabbing cavity designRF coupler designHOM dampers designLLRF tuners designAluminum model designColdmass designDesign Review at ODU/JLabFinal Design Approved
Fabrication PhaseProcure Niobium & NbTiProcure componentsFabricate Al cavity modelLLRF test of Al modelFabricate Nb cavity w/o SR End-Plates Outer Conductor Stiffening RibsProcess cavityAssemble ColdmassCold shock & leak checkShip module to ODU/JLab
Vertical Test PhaseSetup testing at ODU/JLabCooldown cavity & cryoMeasure f, Q vs EMeasure HOMMeasure microphonicsMeasure static Cryo loadPhase II Complete
PHASE IIICryomodule designProcure cryomodule componentsFabricate LHe vesselInstall He vesselFabricate LN jacketCryomodule assembleyCryomodule test setup at ODU/JLab
Milestones Date to complete Milestones Date to completeCrabbing Cavity Design Complete Niobium Cavity Fabrication CompleteAluminum Model Complete Complete assembly of ColdmassLLRF Test of Cu Model Complete Measure f, Q vs EFinal Design Approved Phase II Complete
30-Jun-1228-Feb-1130-Jun-11 30-Jun-12
31-Dec-11
2010 2011
31-Oct-1030-Apr-1231-Dec-10