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EDM Magnetic Shielding (WBS 5) and Magnets (WBS 6) B. Filippone and B. Plaster Caltech Internal Cost and Schedule Review February 11, 2004
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Basic Magnetic Specifications DC Magnetic field of 1-10 mGauss with 0.1% uniformity over volume of measurement cell (50 cm x 12 cm x 7.6 cm) Compensated dressed spin field of ~0.1 Gauss at 1-10 kHz Time stability of < 10 -6 /sec
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Present Magnetic Shielding Baseline Concept cos θ coil: r ~ 61cm; ℓ ~ 393cm 4K ferromagnetic shield: r ~ 61cm; ℓ ~ 400cm superconducting shield: r ~ 63cm; ℓ ~ 400cm 4-layer µ-metal shielding configuration [J. Boissevain]
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Estimated WBS 5 Base Costs 300K ferromagnetic shields –Cylindrical µ-metal shields with end-caps; take baseline 62 mils Larry Maltin (President of Technical Products at Amuneal): –“…confident that we could engineer, fabricate, anneal, and install such a [sized] shield…” CIT Geophysics recently accepted delivery from Amuneal of ~1/3 EDM scale vertical 4-layer shield system Cost estimate with end caps: $610,000 for 4 ~12 month lead time (freight truck shipping) and will require some on-site assembly 4-layer structure estimated to weigh ~ 5.5 English tons For larger spacing between layers: $700,000
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Shield Optimization r = 107cm, 111 cm, 114 cm, 118 cm (nominal design) r = 107cm, 115 cm, 125 cm, 135 cm r = 107 cm, 120 cm, 135 cm, 150 cm
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Estimated Base Costs 4K ferromagnetic shield –Mu-metal does not work well at 4K –Cylindrical 20 mil thickness –Cryoperm option (proprietary alloy) Based on previous quotes r ~ 60cm, ℓ ~ 400cm: $60,000 –Metglas option (metallic glass – rapid solidification) Honeywell quote: $515/kg 20 mils thick will require ~70 kg → $40,000 Al cylinder support frame: $8,000 ~5 miles of 2-inch wide Metglas strips
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Estimated Base Costs Superconducting shield –No experience yet –Pb sheet or cast Pb with Al frame Will require design & engineering efforts –Estimate: $100,400 Other Shielding: e.g. External “Room- sized” (3x7x5 m 3 )Fe/mumetal shield –Estimate for box-type shield: $75,000
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Estimated Base Costs AC demagnetization circuit for the ferromagnetic shields –Demagnetizing prototype Cryoperm and µ-metal shields has proven to be difficult (need some R&D) –High-power, variable-frequency, programmable AC power supply: $25,000 –Demagnetization circuit supplies: $5,000 Technical/Engineering/Machining work at Caltech –Support for design engineer and machinist for assistance with integration of shielding with experiment –Estimated total labor costs: $100,500 Note: We did not include expenses related to materials/construction of support structures for the shielding (only for design engineering) (in WBS 12.4)
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Total Costs Roll Up WBS 5: Magnetic Shielding 5.1 4-Layer Ferromagnetic Shield$1,001,09737% 5.2 Superconducting Shield$142,80040% 5.3 3K Ferromagnetic Shield$79,05622% 5.4 Other Shielding (e.g., “room-sized”)$100,44024% 5.5 Magnetic Penetrations$49,07542% 5 TOTAL$1,372,468 Contingency [Pre-Proposal: $581,000] Note: original 4 layer shield = $250,000 Difference from large increase in size due to spin dressing coils and upper cryostat shield
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Price of Nickel impacts cost of metal London Metal Exchange 1998-2005 ($/ton)
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Proposed Schedule Personnel during construction phase (1.5 FTE): 1 faculty; 1 post-doc; 1 design engineer; 1 machinist; undergraduate student(s) and/or 1 graduate student Estimated Timeline (assuming funding available FY2007) 2007200820092010 Finalize shield design/geometry Finalize/integrate support structure Procure ferromagnetic shields Design/Construct superconducting shield Procure AC demagnetization equipment Install all magnetic shielding Install/test AC demagnetization circuit.....
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Magnets to be constructed –cos θ coil for static field 1-20 mGauss DC field; ±0.1% spatial uniformity; 10 -6 temporal stability –Solenoid as “π/2 r.f.” 3 He and neutron spin-flip coil 0.1 mGauss AC field; 3.165 Hz; 1.58 second duration –Spin-dressing cos θ coils Field parameters to match 3 He and neutron precession frequency –3He spin holding coil (surrounds 3 He collection cell) Accompanying instrumentation needs –Highly-stable AC and DC power supplies –Mapping hardware and probes for field monitoring Labor costs (design engineering and machining/construction) and raw materials will comprise the core costs for WBS 6 –As opposed to mostly procurement costs for WBS 5 Magnets (WBS 6)
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Basic B-Field Concepts x y 3 He spin holding coil
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Estimated Base Costs Design and construction of static cos θ coil: $130,000 –~⅛-scale prototype already constructed at Caltech → have acquired experience with design and machining efforts Design engineering/integration labor costs: $20,000 Materials and supplies: $30,000 Machining/production labor costs: $80,000 –Assuming out-sourcing; in-house could lead to reduction Design and construction of “π/2 r.f.” solenoid: $20,000 –Solenoid → design and construction should be simpler (in principle) Design engineering/integration labor costs: $5,000 Materials and supplies: $10,000 Machining/production labor costs: $5,000
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Estimated Base Costs Construction/integration of spin-dressing coils: $150,000 –Prototype AC cos θ coils to be built as part of the 2005-2006 R&D efforts at Caltech Design engineering/integration labor costs: $20,000 Materials and supplies: $50,000 Machining/production labor costs: $80,000 –Assuming out-sourcing; in-house could lead to reduction AC and DC power supplies: $85,000 –Require highly-stable power supplies and stabilization circuits DC power supply with accompanying stabilization circuit and control for the static cos θ coil: $30,000 Low-frequency AC power supply for “π/2 r.f.” spin-flip solenoid: $10,000 3He spin holding coil: $10,000 High-frequency AC power supply for spin-dressing coils: $20,000 Computer-controlled interface for all power supplies: $15,000 –Possibly coupled to AC demagnetization circuit in WBS 5
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Estimated Base Costs Design &construction of 3He spin holding cos θ coil: $130,000 Design engineering/integration labor costs: $20,000 Materials and supplies: $30,000 Machining/production labor costs: $80,000 –Assuming out-sourcing; in-house could lead to reduction Mapping hardware and probes for (possible) in-situ real-time field monitoring: $80,000 –DC field profile independent of 3 He co-magnetometry –Appropriate tuning of AC fields Computer-controlled positioning/stepping hardware and readout (difficulties due to the cryogenic environment): $50,000 Engineering for integration: $10,000 Cryogenic 3-axis fluxgate magnetometers and probes: $20,000
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Total Costs Roll Up WBS 6: Magnets 6.1 Constant Field cos θ Coil$173,34234% 6.3 r.f. Spin-Flip Coil$29,58734% 6.5 Spin Dressing Coils$202,28634% 6.7 3He cos θ holding coil$173,34234% 6.9 Field Monitors$120,98442% 6.2,6.4,6.6,6.8 Power Supplies$110,16020% 7 TOTAL$809,701 Contingency [ Pre-Proposal: $388,000 ] Difference due to adding Spin Dressing coils and 3 He holding coil
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Proposed Schedule Personnel during construction phase (2.0 FTE): 1 faculty; 1 post-doc; 1 professional staff member; 1 design engineer; 1 machinist; 1 graduate student; undergraduate student(s) Estimated Timeline (assuming funding available FY2007) 2007200820092010 Finalize magnet parameters/geometry Construct/test static cos θ coil Construct/test “π/2 r.f.” spin-flip coil Construct/test spin-dressing coils Procure/test AC and DC power supplies Design field monitors Procure magnetometer/probes Install all magnets.....
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