WBS 6: Magnetic Shielding

1
WBS 6Magnetic Shielding

• B. Filippone and B. Plaster
• Caltech
• December 3, 2004

2
Zeroth-Order Concept
4-layer µ-metal shielding configuration
J. Boissevain
J. Boissevain
4K ferromagnetic shield r 40cm l 300cm
superconducting shield r 50cm l
300cm (neither shown here)
Large cylindrical µ-metal shields with
end-caps r 106.7cm, 110.5cm, 114.3cm,
118.1cm l 445.8cm, 453.39cm, 461.0cm, 468.6cm
cos ? coil r 35cm l 300cm
3
Zeroth-Order Concept
4-layer µ-metal shielding configuration
J. Boissevain
J. Boissevain
4K ferromagnetic shield r 60cm l 400cm
superconducting shield r 63cm l
400cm (neither shown here)
Large cylindrical µ-metal shields with
end-caps r 106.7cm, 110.5cm, 114.3cm,
118.1cm l 445.8cm, 453.39cm, 461.0cm, 468.6cm
cos ? coil r 61cm l 393cm
4
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

5
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

6
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)

7
Costs Roll Up
WBS 6 Magnetic Shielding WBS 6 Magnetic Shielding WBS 6 Magnetic Shielding
6.1 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 2
6.2 Superconducting Shield 50,000 3
6.3 Other Shielding (e.g., room-sized) 75,000 2
6.4 AC Demagnetization Circuit 30,000 1
6.5 Technical/Engineering/Machining Support 30,000 2
6 TOTAL 545,000
Risk Level
1 lowest 3 highest
Pre-Proposal 415,000
8
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)

2007
2008
2009
2010
.....
Finalize shield design/geometry Finalize/integrate
support structure Procure ferromagnetic
shields Construct/test superconducting
shield Procure AC demagnetization
equipment Install all magnetic shielding Install/t
est AC demagnetization circuit
.....
potential hold-ups
9
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
10
WBS 7Magnets

• B. Filippone and B. Plaster
• Caltech
• December 3, 2004

11
Overview of Magnets

• Magnets to be constructed
• cos ? coil for static field
• 1-10 mGauss DC field 0.1 spatial uniformity
  10-6 temporal stability
• Solenoid as p/2 r.f. 3He and neutron spin-flip
  coil
• 0.1 mGauss AC field 3.165 Hz 1.58 second
  duration
• Spin-dressing cos ? 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

12
Zeroth-Order Concept
static cos ? coil
p/2 r.f. solenoid
y
x
superconducting shield
?
spin-dressing cos ? coils 180 phase difference
4K ferromagnetic shield
13
Estimated Costs

• Design and construction of static cos ? 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 p/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

14
Estimated Costs

• Construction/integration of spin-dressing coils
  150,000
• Prototype AC cos ? coils to be built as part of
  the 2005-2006 RD 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 ? coil 30,000
• Low-frequency AC power supply for p/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

15
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

16
Costs Roll Up
WBS 7 Magnets WBS 7 Magnets WBS 7 Magnets
7.1 Static Field cos ? Coil 130,000 2
7.2 r.f. Spin-Flip Coil 20,000 2
7.3 Spin Dressing Coils 150,000 2
7.4 AC and DC Power Supplies 60,000 1
7.5 Field Monitors 80,000 1 and 3
7 TOTAL 440,000
Risk Level
1 lowest 3 highest
Pre-Proposal 270,000
17
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/geometry Construct/test
static cos ? coil Construct/test p/2 r.f.
spin-flip coil Construct/test spin-dressing
coils Procure/test AC and DC power
supplies Design/construct field monitors Procure
magnetometer/probes Install all components
potential hold-ups