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Carl Schultheiss October 16-17, 2019 BNL

This report provides a comprehensive review of the cost, schedule, and status of the sPHENIX infrastructure and facility upgrade, specifically focusing on the Magnet Power Supply and Controls. Topics discussed include the power supply output, energy dump resistor, quench detector system, voltage taps, and more. The report also highlights the results of the high field test conducted in 2018 and addresses any issues and concerns identified during the review.

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Carl Schultheiss October 16-17, 2019 BNL

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  1. Director’s Cost, Schedule and Status Review of thesPHENIX Infrastructure and Facility UpgradeSC MAGNET POWER SUPPLY AND CONTROLS Carl Schultheiss October 16-17, 2019 BNL Director's Cost, Schedule and Status Review

  2. WBS 2.02.04 • Magnet PS/Controls/Quench Protection • SC Magnet Power Supply • Energy Dump Resistor • Quench Detector • Controls • Results of High Field Test 1/29/2018 to 2/16/2018 Director's Cost, Schedule and Status Review

  3. sPhenix Magnet System Director's Cost, Schedule and Status Review

  4. sPhenix Magnet System Power Supply Output 20V @ 5000 Amps Input 480 Vac @ 200 Amps 12 Pulse Star Configuration Free-Wheeling Diodes Water Cooled Director's Cost, Schedule and Status Review

  5. Energy Dump Resistor • 2 Contactors 6000 Amps • Water Cooled Bus • Local Controls • Local Status • Relay Logic Director's Cost, Schedule and Status Review

  6. sPhenix Voltage Taps Director's Cost, Schedule and Status Review

  7. Quench Detector System Director's Cost, Schedule and Status Review

  8. QD System Front End • Copy RHIC Quench Detector Front End • Voltage Clamp • Designed for 300 V, exponential decay with a time constant of 32.25 seconds. (L/R = 2.193 H / 68 mOhm) • Open Lead Detection • Isolation • Gains • Gain of 10 for superconducting busses, gas-cooled leads, and flex bus • Dual Gains of 0.5/0.030 for magnet coils and total magnet voltage Director's Cost, Schedule and Status Review

  9. Quench Detector • 22 Voltage Tap Channels • 5 Aux Input Channels • Magnet Current • PS Current • PS Voltage • Ground Current • Dump Resistor Voltage Director's Cost, Schedule and Status Review

  10. sPhenix PS Control Page Director's Cost, Schedule and Status Review

  11. Schedule Drivers • Power Supply, Energy Dump Resistor and Quench Detector moved to 1008B. • Not in exact position, depends on the final design of water-cooled bus. • Wiring depends on cable tray installation. • Power Wiring depends on electrical distribution installation. • Water systems for Power Supply, Energy Dump Resistor, and Water Cooled Bus. Director's Cost, Schedule and Status Review

  12. Cost Drivers • Water-cooled Bus • Cable Tray • Electrical Distribution Director's Cost, Schedule and Status Review

  13. High Field Test Results • Completed the High Field Test. • Operated magnet at 4830 Amps 105% of operational current (4596 Amps). • Proved Quench Detector Operation • Established quench limits, 50 mV • Tested quench interlocks • Fast Discharge • Slow Discharge • Measured Inductances, Inner 1.081 H, Outer 1.112 H • Measured Gas-Cooled Leads’ flow-rate requirement 0.32 g/sec at 105%. Director's Cost, Schedule and Status Review

  14. High Field Test Results Director's Cost, Schedule and Status Review

  15. Issues and Concerns Issues Actions Added redundant taps to VT11 and VT05. Rerouted VT wiring to connector at bottom of chimney and • Voltage Tap VT11 opened during cooldown • VT10 opened during test at 2800 Amps on 2/9/2018 Director's Cost, Schedule and Status Review

  16. Reviews Director's Cost, Schedule and Status Review

  17. END Director's Cost, Schedule and Status Review

  18. VT11 Opening 1/12/18 Director's Cost, Schedule and Status Review

  19. VT11 Reconnection 1/16/18 Director's Cost, Schedule and Status Review

  20. First Quench 2/16/18 Director's Cost, Schedule and Status Review

  21. Second Quench 2/16/18 Director's Cost, Schedule and Status Review

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