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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