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Status of Magnet R&D Nov. 7 th 2002 James T Volk Fermilab

NLC - The Next Linear Collider Project. Status of Magnet R&D Nov. 7 th 2002 James T Volk Fermilab. James T Volk. 11/07/2002. People Involved. Joe DiMarco, Vladimir Kashikin, James T Volk Fermilab Scott Anderson, Seung Rhee, Cherrill Spencer, James Spencer, Zack Wolf SLAC

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Status of Magnet R&D Nov. 7 th 2002 James T Volk Fermilab

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  1. NLC - The Next Linear Collider Project Status of Magnet R&DNov. 7th 2002James T VolkFermilab James T Volk 11/07/2002

  2. People Involved Joe DiMarco, Vladimir Kashikin, James T Volk Fermilab Scott Anderson, Seung Rhee, Cherrill Spencer, James Spencer, Zack Wolf SLAC Steve Gottschalk STI Optronics Bellevue Washington 11/07/2002 • James T Volk

  3. Modified Motor Quick Disconnect DC Power Lead Thermal Switch Synflex Water Hoses Recessed Core Belt C1006 Solid Steel Modular Core, 215.9 mm long 1/4” Round,Seamless Cu Tubing, Monolithic Coil Lead Potted Coil, 21 Turns Thermocouple Prototype Electromagnetic NLC Linac Quadrupole, Under Test Electro Quad on SLAC test stand 11/07/2002 • James T Volk

  4. Y coordinate of the electromagnetic quad’s magnetic center measured over 2.5 days Current changed in a BBA sequence:black circles are Y center at 80 amps, open circles are Y at 5 different currents which quad would be run at for a BBA: 64, 67.2, 70.4, 73.6, 76.8 amps Run 31, 25th –28th October 2002 Variation in Y during any one BBA sequence to be < 1 micron is satisfied.

  5. Wedge Quad Pole magnets Wedge magnet Tuning rods 11/07/2002 James T Volk

  6. SLAC Rotating Coil Data 11/07/02 James T Volk

  7. Rotational Quadrupole with Correction Coil System Stepping motor Rotational quadrupole assembly Correction coils 11/07/2002 Rotational quadrupole assembly (side view) V.S.Kashikhin

  8. Correction coils Without correction Rotational quadrupole control system With active correction First analog active correction system test… in progress V.S.Kashikhin

  9. Rotational Quadrupole with Correction Coil System 1 m center shift = 1 G dipole field = 1 A correction coil current Integrated signal from measuring coil during magnets rotation Measuring coil Amplifier - Integrator Correction coil Center shift vs. correction coil current Power Supply 11/07/2002 Active Correction System V.S.Kashikhin

  10. Counter Rotating quad microns 11/07/2002 1 um center stability with correction coil V.S.Kashikhin

  11. STI Phase I PM Quad Prototype Results AN SBIR grant to Steve Gottschalk Of STI Optronics of Bellevue Washington An adjustable quad where the magnet material moves James T Volk Work Supported by Department of Energy Grant DE-FG03-01ER83305 11/07/2002

  12. Pole Dovetail slide Rotating coil Stationary magnets (2) Moving Magnets (2) STI Phase I prototype on SLAC bench • All tests done by moving two magnets out of four • James T Volk 11/07/2002

  13. Results on Phase I prototype James T Volk • Strength is linear with brick retraction • Sextupole is acceptable and doesn’t change during retraction of 2 bricks 11/07/2002

  14. Centerline adjustment results • Mechanical advantage 10X • Linear shift with brick retraction • Short term centerline repeatability is 0.4 microns • Fine tune of brick shift with strength can make X CL zero at all retractions • James T Volk 11/07/2002

  15. Long term X centerline results* • Initial increase of X CL by 6 microns with spinning coil due to magnet supports • Hall probe doesn’t show the same effect • Improve supports for magnet and granite block Spinning coil x CL Hall probe x CL • James T Volk 11/07/2002

  16. Phase II prototype • Full size • Engineered! • Motorized • 4 NEMA 17 servo motors • Ethernet servo controller – Galil DMC2142 • Temperature compensated • Preloaded Ball screws and linear guides • 4X faster movement than NLC (neglecting eddy currents) • Modular for flexibility • Servo parts have been ordered • Magnets, poles will be ordered soon • James T Volk 11/07/2002

  17. Preliminary Phase II Quad Design • James T Volk 11/07/2002

  18. Preliminary Phase II prototype schedule • Engineering design complete March 2003 • Fabrication complete May 2003 • Testing starts May 2003 • Majority of prototype tests completed Sept 2003 • Spinning coil fabrication completed March 2003 (STI cost share) • James T Volk 11/07/2002

  19. Halbach Ring Quad LCRD Grant Proposal by J Rosenzweig To build one Poles Magnets Rotating ring • James T Volk 11/07/2002

  20. 1st Stage: Calculate Electromagnet and Power Supply Life Cycle Cost Using SLAC Data Reporting on this today Failure Modes and Effects Analysis to Calculate Life Cycle Cost for NLC Electro and Perm Magnets $WC Magnet $S Solid Wire Coils Water Cooled Coils $SPS $LPS Power Supply $LPS 2nd Stage: Calculate Permanent Magnet Life Cycle Cost Mostly Using Component Failure Rates In Progress 3rd Stage: Compare 1st and 2nd Stage Results to Help Determine Magnet Technology for NLC 11/07/2002 • James T Volk

  21. Partial List of Failure Modes Life Cycle Cost (30yr) FMEA for Electromagnet with Monte Carlo Simulation ($) ($) ($) ($) Monte Carlo Simulation Variables: Detection Time, Fixing Time, Delay Time, Quantity, Parts Cost 11/07/2002 • James T Volk

  22. Estimating Frequency of Water Blockage from Empirical Data Obtained failure history (CATER system) for 5 year period (1997-2001) Expected Downtime = (1-Availability) x Operation hour/year (due to water flow blockages) = (1-0.999007) x 6480 hour/year = 6.4 hour/year (if NLC uses all electromagnets) Occurrence = Expected Downtime / MTTR = 6.4 / 3.02 = 2.1 / year 11/07/2002 • James T Volk

  23. MTBF MTBF+MTTR Estimate for Availability of all Electromagnets for NLC Downtime for all types of magnet failures Total: 7167 Magnets Availability = Estimate for Availability of all Power Supplies for NLC Total: 6167 Power Supplies Estimating Overall Electromagnet System Availability for NLC Magnets + Power Supplies (with redundant large PS ) 11/07/2002 • James T Volk

  24. Predicted Electromagnet Life Cycle Cost for 30 yrs Using Monte Carlo Simulation (5000 runs) 95% of the time the simulation predicts less than this amount # of correctors: 2202 # of water cooled magnets: 4965 Units: Million Dollars Predicted Power Supply Life Cycle Cost 11/07/2002 # of small PS: 2785 # of large PS: 3382 Units: Million Dollars • James T Volk

  25. Radiation Damage • Neodymium Iron Boron is an attractive material for use in Permanent magnets • Lower cost than Samarium Cobalt • Higher energy density than Samarium Cobalt • Less brittle easier to work with • Radiation damage issues • Not well measured especially for higher coercivity materials • But not as resistant as Samarium Cobalt • Issues with activation of Boron Need to test different manufactures and different coercivities 11/07/2002 • James T Volk

  26. Radiation Damage • Radiation Damage to Permanent Magnets LCRD 2.24 • Lucien Cremaldi Unv. of Mississippi • James Volk Fermilab • Expose magnets to gamma rays • Cs 137 662 KeV gamma 180 rad/hr 0.18 Mrad • Co 60 1.16 MeV gamma 80 Krad/hr 80 Mrad 11/07/2002 • James T Volk

  27. Radiation Damage • Radiation damage studies of materials and electronic devices using hadrons LCRD proposal 2.9.1 • Dave Pellett and Max Chertok of UC Davis • James Spencer of SLAC • James Volk of Fermilab • Use the McClellan Nuclear Reactor Center (MNRC) • in Sacramento and UC Davis Crocker Nuclear Lab at Davis • Do both thermal and fast neutrons • Use small quads that fit into rabbit holes • Working on getting spectrum for damping rings and LINAC 11/07/2002 • James T Volk

  28. Facility Thermal < .1 Ev (n/cm2-s) Fast > 1 MeV (n/cm2-s) Heating in Aluminum (W/g) Heating in Tissue (W/g) Diameter (cm) Length (cm) CIF (Water) 4.5 * 1013 8.4 * 1012 0.27 0.65 4.7 38 CIF (Void) 3.2 * 1013 --- --- --- --- --- PTS (Void) 1.4 * 1013 5.7 * 1012 0.12 0.40 1.5 11 NTD (Water) 6.3 * 1011 2.0 * 1010 0.0046 0.0052 10 25 NTD (Void) 7.3 * 1011 --- --- --- --- --- Radiation Damage UC Davis MNRC Irradiation Facility CIF Central Irradiation Facility PTS Pneumatic Transfer System NTD Neutron Transmutation Doping 11/07/2002 • James T Volk

  29. MNRC Rabbit can 11/07/2002 • James T Volk

  30. Radiation Damage Magnet material 2.125” Gap (variable) Flux return 1.125” • James T Volk 11/07/2002

  31. Prototype of Radiation test quad Al spacers Magnetic material Gap for hall probe Direction of B orange arrow 11/07/2002

  32. Radiation Damage Beam pipe between 2 dipoles At Ring to LINAC Septum Calibration 107/sec ceiling

  33. Radiation Damage • Have 2 grants in to study radiation damage in ND-Iron Boron • Working up designs for magnets to fit available space • Measuring spectrum in damping rings • Expect to get some data on radiation damage by this winter • Should have good data by Summer • This will of course lead to more questions, experiments, grants, … • Present data at 18th International Conference on Magnet Technology in Oct 04? • James T Volk 11/07/2002

  34. Future Plans • Continue work on understanding and improving measurement system • Work on motorized drives for PM quads • Work on active correction coils for PM • Continue reliability studies on EM and PMs • Radiation damage studies 11/07/2002

  35. Summary • Slow and steady progress on various adjustable quads • Understanding measurement systems and make improvements • Reliability studies continue • Radiation damage studies beginning should have results by next MAC 11/07/2002 • James T Volk

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