1. NUMI Update on Steel, Coils, Fixtures, and Prototyping J.K. Nelson 12/98 MINOS Meeting

2. NUMI J. Nelson, Steel Update London MINOS Meeting 12/98 2 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

3. NUMI J. Nelson, Steel Update London MINOS Meeting 12/98 3 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

4. NUMI J. Nelson, Steel Update London MINOS Meeting 12/98 4 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).

5. NUMI J. Nelson, Steel Update London MINOS Meeting 12/98 5 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 SensorWHTBRNORGVIOBLK # of turns15555 Area (m 2 )0.07370.01840.01840.00460.0046

6. NUMI J. Nelson, Steel Update London MINOS Meeting 12/98 6 (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

7. NUMI J. Nelson, Steel Update London MINOS Meeting 12/98 7 First Magnetics Results

8. NUMI J. Nelson, Steel Update London MINOS Meeting 12/98 8 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

9. NUMI J. Nelson, Steel Update London MINOS Meeting 12/98 9 Measured Fields Some of the flux seems to be returning via the steel support beams.

10. NUMI J. Nelson, Steel Update London MINOS Meeting 12/98 10 Fringe Field Calculation in the Plane of the Steel

11. NUMI J. Nelson, Steel Update London MINOS Meeting 12/98 11 Fringe Field Calculation: Steel Layout

12. NUMI J. Nelson, Steel Update London MINOS Meeting 12/98 12 Fringe Field Calculation: 4cm in front of the steel plane

13. NUMI J. Nelson, Steel Update London MINOS Meeting 12/98 13 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

14. NUMI J. Nelson, Steel Update London MINOS Meeting 12/98 14 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