edm magnetic shielding (wbs 5) and magnets (wbs 6) b. filippone and b. plaster caltech internal cost...
TRANSCRIPT
EDM Magnetic Shielding(WBS 5)
and Magnets(WBS 6)
B. Filippone and B. PlasterCaltech
Internal Cost and Schedule Review
February 11, 2004
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
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]
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
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
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
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 m3)Fe/mumetal shield – Estimate for box-type shield: $75,000
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)
Total Costs Roll Up
WBS 5: Magnetic Shielding5.1 4-Layer Ferromagnetic Shield $1,001,097 37%
5.2 Superconducting Shield $142,800 40%
5.3 3K Ferromagnetic Shield $79,056 22%
5.4 Other Shielding (e.g., “room-sized”) $100,440 24%
5.5 Magnetic Penetrations $49,075 42%
5 TOTAL $1,372,468
Contingency
[Pre-Proposal: $581,000]
Note: original 4 layer shield = $250,000
Difference from large increase in size due to spin dressing coils and upper cryostat shield
Price of Nickel impacts cost of metal
London Metal Exchange 1998-2005 ($/ton)
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)
2007
2008
2009
2010
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.” 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 match 3He and neutron precession frequency
– 3He spin holding coil (surrounds 3He 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)
Basic B-Field Concepts
x
y
3He spin holding coil
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
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
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 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
Total Costs Roll Up
WBS 6: Magnets6.1 Constant Field cos θ Coil $173,342 34%
6.3 r.f. Spin-Flip Coil $29,587 34%
6.5 Spin Dressing Coils $202,286 34%
6.7 3He cos θ holding coil $173,342 34%
6.9 Field Monitors $120,984 42%
6.2,6.4,6.6,6.8 Power Supplies $110,160 20%
7 TOTAL $809,701
Contingency
[ Pre-Proposal: $388,000 ]
Difference due to adding Spin Dressing coils and 3He holding coil
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)2007
2008
2009
2010
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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