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Spectrometer Solenoid Update

Detailed summary of the latest control system upgrades and magnet progress for MICE project. Features schedule, key upgrades, recent activities, problem fixes, training, and progress on the second magnet assembly.

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Spectrometer Solenoid Update

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  1. Spectrometer Solenoid Update MICE CM35 RAL/Abingdon February 14, 2013 Steve Gourlay Steve Virostek Lawrence Berkeley National Lab

  2. Topics • Control system upgrade • Latest magnet training results • Summary of 2nd magnet progress • Schedule

  3. Control System Upgrade • A control system review was held at LBNL on December 11th and 12th, 2012 • The LBNL/MICE team has responded to the numerous recommendations from the review panel • The main goal was to move towards a more robust system capable of preventing a repeat of the ice blockage and other potential failures • A secondary goal was to move closer to the final system that will be operated in the MICE hall

  4. Control System Upgrade • Some of the more important upgrades: • Incorporated a stand alone PID controller for the cold mass heater circuit w/current monitor • Added an alarm handler to the control software • Installed a gas bottle backup system to prevent negative cold mass pressures; improved durability of pressure relief valves • Added current shunts to directly measure the current going into the coils

  5. Power Supplies and Control • Power Supplies • New 500 A supply for center and end coils • 5 supplies fully integrated • Tested both into a short and into the cold magnet • Control rack • Many upgrades installed • UPS added • New heater control loop

  6. Recent Activity Lots of help – much appreciated!

  7. Recent Effort by Many People • Many people have come to Wang NMR to help with system preparation and training: • Control system: Steve Griffiths, Ian Mullacrane, Adrian Oates (Daresbury) • Control software: PierrickHanlet (FNAL) • Quench system: Roman Pilipenko (FNAL) • Cooldown: Heng Pan, TianhuanLuo, Allan DeMello, Andrew Lambert, Nanyang Li, Steve Virostek (LBNL) • Training: Linda Coney, Maria Leonova (FNAL); Heng Pan, TianhuanLuo, Etienne Rochepault, Steve Virostek (LBNL) • And numerous others behind the scenes

  8. Working on Both Magnets Training Assembly

  9. Current Progress • Magnet has been successfully cooled down, and training is now under way • All five power supplies are being used at various ramp rates and under computer control • New cold mass heater control loop working well • Three training quenches are now complete • Three unrelated issues have caused premature quenches during training: failed contactor relay, short circuit in charging circuit, trim supply control issue • These problems all appear to have been remedied

  10. Problem Fixes • Contactor relay • It appears the faulty relay had been cycling when the magnet was warm and eventually wore out • The unit was replaced by the Daresbury team, and there have been no problems since • Charge/discharge circuits • Short circuits were discovered in two of the units between the diodes and the heat sink block • All four units were rebuilt: disassemble, contacts cleaned, replace Kapton film, reassemble, torque bolts, checkout • Trim supply control • Control system reboot appears to have fixed problem

  11. Charge/discharge Circuits

  12. Recent Training Runs HTS lead failure After warmup, control sys mods, and cooldown After warmup, HTS lead replace and cooldown

  13. 2nd Magnet Progress • The second cold mass/shield assembly is now complete - in the vacuum vessel, MLI wrapped • Benchtop assembly of the vacuum vessel tower is nearing completion – delayed by availability of additional cryocooler sleeves • LBNL mechanical technicians playing a key role in assembly – currently affected by ALS shutdown • Cryocooler tests are also under way – 4 coolers purchased by U. Miss., test of 2X length hoses

  14. 2nd Magnet Progress Cryocooler testing

  15. 2nd Magnet Progress Benchtop assembly of 2nd magnet tower

  16. Schedule • Cooldown completed at the end of January • Training and magnetic measurement likely continue into early March • 2nd unit assembly expected to be complete in April – training to follow shortly after • Current schedule calls for both magnets to be delivered to RAL in early August ‘13 • 2nd magnet progress affected by 1st magnet training and LBNL tech availability

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