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Cryocooler Performance Issue Study at LBNL - Magnet Status and Milestone Updates

Updates on the spectrometer solenoids and cryocooler performance issue study at LBNL in August 2013. Details include testing results, magnet status, shipping preparations, and milestone updates.

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Cryocooler Performance Issue Study at LBNL - Magnet Status and Milestone Updates

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  1. Spectrometer SolenoidsMICO 230Steve VirostekLBNLAugust 7, 2013

  2. The magnet was cooled down to LHe temperature two weeks ago. • Iron shield with 60 cm hole has been mounted. • Low current testing (up to 50 A) revealed resistive behavior in the E2 coil 500 A HTS lead – worse than previous failed HTS lead. • All other HTS and LTS leads appeared normal; PS’s were working well. • With shield cold, system was not quite condensing He fast enough to pull cold mass pressure downward. • Current thinking is that the issue is related to cryocooler performance. • No indications of excessive heat leak to cold mass at this point. • System is now being warmed up in order to replace bad HTS lead and to swap out at least three cryocoolers. • We expect to be ready for cool down again one week from today and possibly ready to commence training on August 19th. Status of SS1

  3. Status of SS2 • All training and magnetic mapping are complete. • Magnet is warm and being prepared to ship (delayed due to SS1 work). • Two-stage cryocoolers have been removed. • Iron shield has been removed, brackets are being removed. • Rigging company representative has visited Wang to discuss loading of magnet onto truck for delivery to airport. • LBNL shipping company (Aeronet) representatives have visited Wang to discuss various shipping options – quote forthcoming. • Custom shipping pallet with shock isolators are now on hand. • Crates for additional hardware are all on hand (6 crates total for cooler heads, compressors, hoses, iron shield, brackets, misc hdw.). • Necessary paperwork is being assembled.

  4. Milestone Update Upstream Spectrometer Solenoid (SS2) • Ready for shipping: revised to 21-Aug-13 • Delayed due to prep and repair work on SS1 • SS#2 at RAL: revised to 04-Sep-13 Downstream Spectrometer Solenoid (SS1) • Acceptance tests complete: revised to 06-Sep-13 • Delayed due to bad HTS lead requiring warm up and repair • Field mapping complete: revised to 20-Sep-13 • Ready for shipping: revised to 04-Oct-13 • SS#2 at RAL: revised to 18-Oct-13

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