wbs 6: magnetic shielding b. filippone and b. plaster caltech december 3, 2004
DESCRIPTION
Zeroth-Order Concept cos θ coil: r ~ 61cm; ℓ ~ 393cm 4K ferromagnetic shield: r ~ 60cm; ℓ ~ 400cm superconducting shield: r ~ 63cm; ℓ ~ 400cm (neither shown here) 4-layer µ-metal shielding configuration Large cylindrical µ-metal shields with end-caps: r ~ 106.7cm, 110.5cm, 114.3cm, 118.1cm ℓ ~ 445.8cm, cm, 461.0cm, 468.6cm [J. Boissevain]TRANSCRIPT
WBS 6:Magnetic Shielding
B. Filippone and B. PlasterCaltech
December 3, 2004
Zeroth-Order Concept
cos θ coil:r ~ 35cm; ℓ ~
300cm
4K ferromagnetic shield: r ~ 40cm; ℓ ~ 300cm
superconducting shield: r ~ 50cm; ℓ ~ 300cm(neither shown here)
4-layer µ-metal shielding
configuration
Large cylindrical µ-metal shields with end-caps:
r ~ 106.7cm, 110.5cm, 114.3cm, 118.1cmℓ ~ 445.8cm, 453.39cm, 461.0cm, 468.6cm
[J. Boissevain]
[J. Boissevain]
Zeroth-Order Concept
cos θ coil:r ~ 61cm; ℓ ~
393cm
4K ferromagnetic shield: r ~ 60cm; ℓ ~ 400cm
superconducting shield: r ~ 63cm; ℓ ~ 400cm(neither shown here)
4-layer µ-metal shielding
configuration
Large cylindrical µ-metal shields with end-caps:
r ~ 106.7cm, 110.5cm, 114.3cm, 118.1cmℓ ~ 445.8cm, 453.39cm, 461.0cm, 468.6cm
[J. Boissevain]
[J. Boissevain]
Estimated Costs• 4K ferromagnetic shield
– Open cylinder with no end caps• 20 mil thickness
– Cryoperm option• Amuneal quote for r ~ 40cm,
ℓ ~ 300cm: $30,000• Scale up to latest reference
design of r ~ 60cm, ℓ ~ 400cm: $60,000
– Metglas option• Honeywell quote: $515/kg
• 20 mils thick will require ~70 kg → $40,000
• Al cylinder support frame: $8,000
• VERY LABOR INTENSIVE: ~5 miles of 2-inch wide Metglas strips !!!
• 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…”
• Cost estimate for largest cylinder with end caps: $60,000 → ~$250,000 for 4
• If want larger spacing between layers: $300,000
• ~3 to 6 month lead time (freight truck shipping) and will require some on-site assembly
• 4-layer structure estimated to weigh ~2.5 English tons
Estimated Costs• Superconducting shield
– Not as well thought out at this point– Proposed idea is to melt lead and pour into a cylindrical Al
casting frame• Will require design engineering efforts
– Estimate: $100,000• $100,000 is estimated cost in pre-proposal• No experience yet; crude guess is $50,000• In-house vs. out-sourcing
• “Room-sized” box-type µ-metal shield or large tri-axial square Helmholtz bucking coils– Estimate for thin (14 mil) box-type (or large cylindrical) shield:
$75,000
Estimated Costs• AC demagnetization circuit for the ferromagnetic shields
– Demagnetizing prototype Cryoperm and µ-metal shields has proven to be difficult (later talk)
– 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 labor costs: $30,000
• Note: We did not include expenses related to materials/construction of support structures for the shielding (only for design engineering)
Costs Roll Up
WBS 6: Magnetic Shielding6.1 5-Layer Ferromagnetic Shield $360,000 2 6.1a 0.3K Ferromagnetic Shield $60,000 2 6.1b 300K 4-Layer Ferromagnetic Shield $300,000 26.2 Superconducting Shield $50,000 36.3 Other Shielding (e.g., “room-sized”) $75,000 26.4 AC Demagnetization Circuit $30,000 16.5 Technical/Engineering/Machining Support
$30,000 2
6 TOTAL $545,000
Risk Level
[ 1 = lowest; 3 = highest ]
[Pre-Proposal: $415,000]
Proposed Schedule• Personnel during construction phase (1.0 FTE): 1 faculty; 1
post-doc; 1 design engineer; 1 machinist; undergraduate student(s) and/or 1 graduate student
• Rough Timeline (assuming funding available FY2007)200
72008
2009
2010
Finalize shield design/geometryFinalize/integrate support structureProcure ferromagnetic shieldsConstruct/test superconducting shieldProcure AC demagnetization equipmentInstall all magnetic shieldingInstall/test AC demagnetization circuit
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potential hold-ups
300K Four-Layer Shield
r = 106.7cm, 110.5cm, 114.3cm, 118.1cm (nominal design)r = 106.7cm, 115.0cm, 125.0cm, 135.0cm r = 106.7cm, 120.0cm, 135.0cm, 150.0cm
WBS 7:Magnets
B. Filippone and B. PlasterCaltech
December 3, 2004
Overview of Magnets• Magnets to be constructed
– cos θ coil for static field• 1-10 mGauss DC field; ±0.1% spatial uniformity; 10-6 temporal stability
– Solenoid as “π/2 r.f.” 3He 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 be defined …
• 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 7 – As opposed to mostly procurement costs for WBS 6
Zeroth-Order Conceptstatic cos θ coil“π/2 r.f.”
solenoid
spin-dressing cos θ coils [180° phase
difference]
4K ferromagnetic shield
Χx
y
superconducting shield
Estimated Costs• Design and construction of static cos θ coil: $130,000
– ¼-scale prototype already constructed at Caltech → have acquired experience with design and machining efforts (later talk)
• 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
Estimated 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: $60,000– Require highly-stable power supplies and stabilization circuits
• DC power supply with accompanying stabilization circuit for the static cos θ coil: $30,000
• Low-frequency AC power supply for “π/2 r.f.” spin-flip solenoid: $10,000
• High-frequency AC power supply for spin-dressing coils: $10,000• Computer-controlled interface for all power supplies: $10,000
– Possibly coupled to AC demagnetization circuit in WBS 6
Estimated Costs• Mapping hardware and probes for (possible) in-situ
real-time field monitoring: $80,000– DC field profile independent of 3He 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
Costs Roll Up
WBS 7: Magnets7.1 Static Field cos θ Coil $130,000 27.2 r.f. Spin-Flip Coil $20,000 27.3 Spin Dressing Coils $150,000 27.4 AC and DC Power Supplies $60,000 17.5 Field Monitors $80,000 1 and 37 TOTAL $440,000
Risk Level
[ 1 = lowest; 3 = highest ]
[ Pre-Proposal: $270,000 ]
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)
• Rough Timeline (assuming funding available FY2007)2007
2008
2009
2010
Finalize magnet parameters/geometryConstruct/test static cos θ coilConstruct/test “π/2 r.f.” spin-flip coilConstruct/test spin-dressing coilsProcure/test AC and DC power suppliesDesign/construct field monitorsProcure magnetometer/probesInstall all components
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potential hold-ups