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Update onSteel, Coils, Fixtures, and Prototyping
J.K. Nelson
12/98 MINOS Meeting
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J. Nelson, Steel UpdateLondon MINOS Meeting 12/98
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Outline
• Steel Purchase and Fabrication• Steel bid package
• Finalizing the machining package
• Coil and Magnetics• Initial test program
» First magnetics data
• Fringe Fields: Data vs FEA
• Fixtures
• 4PP Plans
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Steel Purchase
• Steel Advanced Procurement Plan and Specifications• Approved by MINOS, consultants, PPD, and Procurement on
11/11/98
• Steel bid package went public 12/1• Sent to 4 prequalified vendors
– Ryerson (IL, MN)– USX (IN)– Bethlehem (IN)– Olympic (MN, IL)
• Open for bid for one month • Purchase of 4 planes and options for up to 3 SM and Near
• Opening of bids expected the first week of 1/99• Selection and Best-and-Final to follow
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Steel Purchase (Cont.)
• Machining bid package expected to be released in a week.• Prequalified vendors
– Ryerson (MN, IL)
– Olympic (MN, IL)
– SVF (IL)
– Napco (IL)
• Same steps as in the steel procurement
• Final mill and fabricator will be selected based on lowest total cost (including transportation costs).
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Magnetics Test Program
• 150 turn coil wrapped around the 1PP and powered on 10/29
• Then• A sense coil read out by an integrator monitored the flux
• Now • 4 additional mini-sense coils• Hall probe measurements of fields in air
Sensor WHT BRN ORG VIO BLK
# of turns 1 5 5 5 5
Area (m2) 0.0737 0.0184 0.0184 0.00460.0046
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(Cont.)
• Near-term goals
– Obtain an absolute calibration of average field in a coil.
– Estimate the effective gap span in the spates
• Future: Try to measure the inductance using an oscillator and mini-sense coil
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First Magnetics Results
VIO COIL
-1.500
-1.000
-0.500
0.000
0.500
1.000
1.500
-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00
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Fields in In Gaps, in Holes, and Beyond the Steel
• Used Hall probe to look at fields in the largest crack (~1/8”).
• The field was about 800Gauss
• Used Hall probe to look at fields in a 3/8” hole drilled through both plates.
• The field was about 60Gauss
• Used Hall Probe to look at fringe fields.• Values ranged from
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Measured Fields
Some of the flux seems to be returning via the steel support beams.
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Fringe Field Calculation in the Plane of the Steel
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Fringe Field Calculation: Steel Layout
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Fringe Field Calculation: 4cm in front of the steel plane
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Thermal Data
• After 60min at 100A the core temperature (without cooling) was 170C in the core of the coil
• Our thermal models will be tested for accuracy in this extreme case
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4PPTF
• Planned meeting for 1/15-16 at Fermilab• The 15th will be devoted to issues related to steel, magnetics, steel
installation and handling• The 16th will be devoted to integration issues including
» Mounting modules» Installation » Clear cable routing» Electronics support and locations» Readout requirements» 4PP DAQ
• Planned meeting for 2/7 in LA• MINOS Steel and Coil meetings at Fermilab
» (almost weekly) Thursdays at 1:30 in 11SW