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Spectrometer Solenoids MICO 214 Steve Virostek LBNL February 6, 2013

Spectrometer Solenoids MICO 214 Steve Virostek LBNL February 6, 2013. The magnet was cooled down using LN Wednesday-Friday last week with 24 hr monitoring. Some liquid nitrogen had collected in the cold mass and was removed with a warm He purge followed by 5 cycles of pump/purge.

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Spectrometer Solenoids MICO 214 Steve Virostek LBNL February 6, 2013

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  1. Spectrometer SolenoidsMICO 214Steve VirostekLBNLFebruary 6, 2013

  2. The magnet was cooled down using LN Wednesday-Friday last week with 24 hr monitoring. • Some liquid nitrogen had collected in the cold mass and was removed with a warm He purge followed by 5 cycles of pump/purge. • LHe cooldown and filling completed last Friday evening; system was initially losing helium due to high shield temperatures (~200K). • As of last Saturday, the magnet temperatures had reached their normal operating condition. • The new cold mass heater control loop is operating as designed; with excess cooling power, the heater is maintaining a set positive pressure • The magnet training will likely start today, after a few additional power supply tests (see next page). • We currently have 3000 liters of LHe on hand; an additional 2000 liters is scheduled to arrive on Monday. Current Status

  3. Power Supplies • A new TDK-Lambda power supply for the E1/Center/E2 coils has been installed; all PS rack components now running on 220V. • Off line power supply tests carried out last week (including trims). • All five power supplies have been fully integrated with the control system. • Tests with current in the magnet were carried out in the last two days. • Issues with one of the AMI 420 controllers resulted in the need for two of the controllers to be shipped from the UK (arrived yesterday). • System appears to be fully functional now – tested in an integrated manner to 50 A in the coils (45 A in the end coils). • Minor issue with one of the PS/controller sets to be further investigated later today. • No voltage issues with any of the HTS leads at 50 A.

  4. Other Progress • Numerous other enhancements to the control system have been incorporated and have been tested (rack UPS, alarm handler, autoSMS, 2nd pressure gauge, PS current shunts, cold mass gas bottle backup,…). • Independent cold mass heater control circuit implemented for greater reliability. • Cryocooler tests currently under way – 4 coolers purchased by U. Miss. being tested by Wang NMR for condensing power. • One additional cooler test will determine the performance loss due to double length helium lines.

  5. 2nd Magnet • The second magnet construction is continuing at Wang NMR. • The cold mass has been installed in the vacuum vessel and aligned. • Radiation shield has been suspended in the vessel, and the shield bore and end plates have been welded in place • Radiation shield temperature sensors have been routed towards the vessel tower • MLI on the outer radiation shield is complete • Tower assembly consisting of outer stainless steel box, 1st stage copper plates, cryocooler sleeves and warm leads nearing completion • Completion expected in approximately two months

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