Brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Inner Triplet Review Q1, Q2, and Q3 Mechanics T. Nicol April 24-25, 2007.

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Presentation transcript:

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Inner Triplet Review Q1, Q2, and Q3 Mechanics T. Nicol April 24-25, 2007

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Complete magnet assembly (Q3)

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Q1 supports at IP 5L

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Brief history of notable design features External heat exchanger (including the corrugated copper tube) –Driven by different Q1/Q3 and Q2 cold mass diameters from Fermilab and KEK. At the time of the initial design both labs were planning to build cold masses of each type. The external design allowed a magnet-independent heat exchanger design. Spider support –Driven by the external heat exchanger which required a lot of radial space and precluded a suspension more like support posts used in the arc dipoles. –We sought to make a suspension system that was laterally stiff to preclude small oscillations due to ground motion and other influences. –Wanted to minimize warm to cold deviations. –Constant pressure to minimize static heat load lead to reduced thickness supports. Welded cold mass bellows –Driven by the desire to make quick connections to the Fermilab Magnet Test Facility feedbox without welding and subsequent cutting. –Performance history at Fermilab has been good albeit with smaller diameters and lower operating pressures. –We learned later that allowed pressures from manufacturers only apply when the bellows are compressed flat and restrained.

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Documentation Engineering Notes Technical Memos and Papers Specifications QA Documents Drawings Design Reviews Meetings and Workshops Are all available at:

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Materials 304 stainless steel – Piping, flanges, etc. –Allowable stress: 138 MPa (20000 psi) 304L stainless steel – Cold mass skins –Allowable stress: 115 MPa (16700 psi) 6061-T6 aluminum – Shield shells and extrusions, pipe supports –Allowable stress: 59 MPa (8600 psi) Carbon steel - Vacuum vessel –248 MPa (36000 psi) min yield, Charpy toughness 21 J/cm2 min, 28 J/cm2 average over 3 tests (equivalent to L485MB) G-11 CR – Supports –Allowable stress: 69 MPa (10000 psi) based on 139 MPa (20000 psi) ultimate C932 bearing bronze – Support rods, cold mass adjusting screws

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Loads considered Shipping and handling loads. Vertical and lateral loads were thought to be the dominant loads driving the design of the suspension system. Axial shipping loads were always thought to be handled by external restraints. Cooldown loads associated with change in diameter and length of the cold mass, piping, and thermal shield. Pressure loading on the piping support system. Early design efforts focused more on individual magnet and cryostat elements rather than the system as a whole. Forces due to pressure asymmetries were underestimated and underappreciated. Vacuum loading on the external support system. Cold mass weight.

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Internal piping nomenclature

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Piping parameters

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Magnet and cold mass weights

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Q1 and Q3

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Q1 internal piping assembly F Q1-Q2

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Q3 internal piping assembly F Q1-DFBX F Q1-Q2

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Path of forces Forces originate at the magnet interconnect from bellows spring forces and pressure induced axial forces… …they act on the internal piping and are transmitted to the cold mass through the pipe anchors… …then are transferred to the support structure through the anchor and slide mechanisms… …then to the vacuum vessel through the external support lugs… …and finally to the floor through the external jacks.

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Q1 and Q3 forces Bellows forces, Fb, are due to pressure and mechanical compression and extension

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Magnet to magnet interconnect

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Bellows forces at design pressure

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Bellows forces at test pressure

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Bellows forces due to cooldown

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Q1 pipe support weldment (Q3 similar)

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Q1 pipe support weldment proposed modification As designed pipe anchor stresses Bracket to cold mass weld stress: psi (288 MPa) Elbow to end dome weld stress: psi (120 MPa) Modified pipe anchor stresses Bracket to cold mass weld stress: 9121 psi (63 MPa) Elbow to end dome weld stress: 9430 psi (65 MPa) See Q1 Pipe Anchor Stress Analysis – T. Page, April 19, 2007

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Spider and cold mass attachment

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Spider and cold mass attachment

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Spider and tie bar assembly

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Vacuum vessel attachment

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Vacuum vessel attachment

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Completed cold mass and piping on spider supports

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Completed cold mass and piping on spider supports

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, External jack stands in warm fit-up

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Q2

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Q2 internal piping assembly F Q2-Q3 F Q1-Q2

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Path of forces Forces originate at the magnet interconnect from bellows spring forces and pressure induced axial forces… …they act on the internal piping and are transmitted to the cold mass through the pipe anchors… …then are transferred to the support structure through the anchor and slide mechanisms… …then to the vacuum vessel through the external support lugs… …and finally to the floor through the external jacks.

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Q2 forces Bellows forces, Fb, are due to pressure and mechanical compression and extension

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Magnet to magnet interconnect

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Bellows forces at design pressure

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Bellows forces at test pressure

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Bellows forces due to cooldown

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Q2 pipe support

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Q2 pipe support shear stresses (Forces due to bellows installation forces at one end only.)

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Spider and cold mass attachment

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Spider and cold mass attachment

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Spider and tie bar assembly

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Vacuum vessel attachment

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Vacuum vessel attachment

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Completed cold mass and piping on spider supports

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Completed cold mass and piping on spider supports

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, External jack stands in warm fit-up

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Combined systems

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Summary of items tested Heat exchanger performance extensively tested in full-scale prototype Corrugated tube test. Two supports tested to simulate lateral, vertical, and cooldown loads Slide material tests Shipping and handling test Bellows tests –Cooldown and shield line bellows tested to 25 bar – result lead to redesign of all bellows except for cold mass bellows –Cold mass bellows tested to 25 bar – result lead to supplemental squirm protection incorporated into bellows restraints Warm fit-up at CERN in building 181

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Heat exchanger test

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Heat exchanger test

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Spider support test Two tests to failure in the horizontal direction. Failure at: lb (81847 N) and lb ( N) S.F. on lateral load of 1.75 for Q1/Q3 and 2.25 for Q2 based on minimum test result

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Warm fit-up assembly

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Interconnect at warm fit-up

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Interconnect at warm fit-up

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Cold mass bellows test

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Pressure tested items at Fermilab 25 bar test –Completed cold mass –Cold mass pipes and bellows (M1, M2, M4) –Heat exchanger outer shell (L) –Cooldown line (LD) in Q1 –EE, and FF only one article –XBt and collection volume tested to 5 bar after addition of the collection volume Pressurized leak test –Competed Q1 and Q3 cold masses and all internal piping pressurized to 2 bar with cryostat evacuated Vacuum leak tested –All internal components and completed system piping prior to cryostating

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Shipping

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Typical magnet shipping configuration

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Analysis results - 2g vertical + 1g lateral load Shipping and handling loads: Lateral: 1g Vertical: 2g (1g + weight) Axial: 0.1g w/ restraint  max = psi (76 MPa)

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Tie rod assembly at warm fit-up

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Tie bar analysis load cases and results Load case 1 – All vacuum vessels are allowed to slide on their vertical supports in Z without resistance. The system is constrained against Z-motion only at the end of the DFBX-to-V3 connecting rods. Loading is 25 bar warm pressure test loading. Load case 2 – Vacuum vessels constrained as in load case 1. Loading is the 25 bar warm pressure testing loading, plus the vacuum load. Load case 3 – Jacks with a Z compliance of lbs/in are placed at each vessel at the support location nearest the IP. Loading is the same as load case 1. Load case 4 – Vacuum vessels constrained as in load case 3. Loading is the same as load case.

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Vacuum vessel ear deflection – Case 1 (worst case)

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Vacuum vessel ear deflection – Vacuum only Ear deflection = (0.156 – 0.133) in = in (0.6 mm)

brookhaven - fermilab - berkeley US LHC ACCELERATOR PROJECT LHC IRQ Cryostat Review April 24-25, Other areas of concern Interconnect “H” piece should be tested to 25 bar with ends configured comparable to actual installation. Q1 and Q3 internal piping anchors. Column buckling of the cryostat pipes, particularly the LD line. Should be mechanically tested.