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NuMI Magnets or What to look for in a gift magnet’s mouth

NuMI Magnets or What to look for in a gift magnet’s mouth. David Harding 3 November 2008. Cheaper, defined Quicker Focuses beam design Minimizes rad waste Known properties No surprises. But not free But not instantaneous Limits beam design Rad exposure False assumptions Surprises.

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NuMI Magnets or What to look for in a gift magnet’s mouth

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  1. NuMI MagnetsorWhat to look for in a gift magnet’s mouth David Harding 3 November 2008

  2. Cheaper, defined Quicker Focuses beam design Minimizes rad waste Known properties No surprises But not free But not instantaneous Limits beam design Rad exposure False assumptions Surprises Re-using MagnetsPros & Cons David Harding DUSEL Beamline Working Group

  3. Metal prices have been volatile David Harding DUSEL Beamline Working Group

  4. 6-3-120 Dipoles • Not used in final beamline design, but several rehabbed for early design and BNB • Venerable magnets had been sitting in decommissioned beamlines David Harding DUSEL Beamline Working Group

  5. 6-3-120 Surprises • Poor coil-to-ground insulation • Much work • Extra time • Extra cost David Harding DUSEL Beamline Working Group

  6. Inside an old 6-3-120 dipole David Harding DUSEL Beamline Working Group

  7. An old 6-3-120 David Harding DUSEL Beamline Working Group

  8. B2 Dipoles • Specs changed, clarified in process • Tolerances on beam tube length and flange position • Worked out fine in the end • Could have been substantial cost increase David Harding DUSEL Beamline Working Group

  9. EPB Dipoles • Extensively used in NuMI and SY120 • Venerable magnets had been sitting in decommissioned beamlines David Harding DUSEL Beamline Working Group

  10. EPB Dipole comments • As with B2 dipoles, beam tube length, flange position, squareness issues • Multiple bus, manifold possibilities • Magnetic shielding effort successful • Notoriously fragile insulators • Have been problematic • Upgrade designed, tested, to be installed David Harding DUSEL Beamline Working Group

  11. EPB Dipole photos David Harding DUSEL Beamline Working Group

  12. 3Q120 Quadrupoles • Extensively used in NuMI and BNB • Venerable magnets had been sitting in decommissioned beamlines David Harding DUSEL Beamline Working Group

  13. 3Q120 Surprises • Many variants • Many ground faults and water leaks • Mostly not repairable • Water needs • Power supply needs David Harding DUSEL Beamline Working Group

  14. 3Q120 photos David Harding DUSEL Beamline Working Group

  15. 3Q120 Variants • Two core sizes • Better high field performance? No! • Solid conductor or hollow  • 118 turns/pole or 28 turns/pole • Cooling fins (solid conductor) • 8 fins or 12 fins (and variants on manifolding) • Copper or aluminum • Cooling paths (hollow conductor) • 8 paths or 16 paths • Beam tube • Round or star David Harding DUSEL Beamline Working Group

  16. 3Q120 Failures • Some magnets rejected before attempting rework • Ground faults • About ¼ of magnets selected for rework failed • Mostly water leaks • Generally not repairable • Competing with other projects for good ones David Harding DUSEL Beamline Working Group

  17. 3Q120 Cooling • Confusion regarding • Current needs for working gradients • Power for DC operation • Water needs for adequate cooling • Actual water flow • Ramp the magnets or add cooling? • Added external cooling jackets for hottest magnets • Will eventually replace with hollow conductor • All worked out in the end with some anquish David Harding DUSEL Beamline Working Group

  18. Trim Dipoles • Commitment to MI style trims • Requirements changed with beam design • Had to add external cooling David Harding DUSEL Beamline Working Group

  19. Magnet with spacers, coolers David Harding DUSEL Beamline Working Group

  20. Closeout magnet reports • http://tdserver1.fnal.gov/project/JobFiles/Current_Jobs/0201_BDP/Closeout/0201-BDP_summary.doc • http://tdserver1.fnal.gov/project/JobFiles/Current_Jobs/0191_QQM/Closeout/0191-QQM_summary.doc • http://tdserver1.fnal.gov/Project/JobFiles/Current_Jobs/0188_IDH/closeout/0188-IDHx_summary.doc David Harding DUSEL Beamline Working Group

  21. Lessons Learned • Re-used magnets can be good • Look that gift horse in the mouth • Ask the experts rather than relying on 20+ year old notes • System integration is critical • Optics, magnets, power, water, operations • Changing course in mid-stream adds cost • Close communication is essential David Harding DUSEL Beamline Working Group

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