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Update onSteel, Coils, Fixtures, and Prototyping

J.K. Nelson

12/98 MINOS Meeting

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

J. Nelson, Steel UpdateLondon MINOS Meeting 12/98

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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

J. Nelson, Steel UpdateLondon MINOS Meeting 12/98

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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).

J. Nelson, Steel UpdateLondon MINOS Meeting 12/98

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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

J. Nelson, Steel UpdateLondon MINOS Meeting 12/98

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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

J. Nelson, Steel UpdateLondon MINOS Meeting 12/98

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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

J. Nelson, Steel UpdateLondon MINOS Meeting 12/98

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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

J. Nelson, Steel UpdateLondon MINOS Meeting 12/98

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Measured Fields

Some of the flux seems to be returning via the steel support beams.

J. Nelson, Steel UpdateLondon MINOS Meeting 12/98

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Fringe Field Calculation in the Plane of the Steel

J. Nelson, Steel UpdateLondon MINOS Meeting 12/98

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Fringe Field Calculation: Steel Layout

J. Nelson, Steel UpdateLondon MINOS Meeting 12/98

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Fringe Field Calculation: 4cm in front of the steel plane

J. Nelson, Steel UpdateLondon MINOS Meeting 12/98

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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

J. Nelson, Steel UpdateLondon MINOS Meeting 12/98

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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