[Hallb-engineering] HD-Ice run canceled
burkert at jlab.org
Wed May 4 14:13:18 EDT 2011
All shifts until the end of the scheduled run period until May 13 are
canceled. Unfortunately, due to a problem with a critical needle valve
the HD-Ice team was unable to cool the magnet down to its operating
temperatures. Attempts to unclog or otherwise fix the valve without
fully warming up or opening up the IBC were unsuccessful. A complete
warm-up and cool-down cycle would take over a full week making any
attempt at repairing the offending valve within the available time an
The plan now is to continue tests with the superconducting magnets and
the new NMR system before warming the IBC up to room temperature and
transferring it back to the HDIce Lab.
The long term plan is to have the IBC repaired a do some improvements on
the cryogenics system where necessary. Then cool down the system in the
Lab and be ready for an early installation in Hall B long before the
machine comes backup after the 6 months shutdown. This should give us
sufficient time to have a fully operating target long before the
scheduled beam time begins in November 2011.
I like to thank the HDIce team and the Hall B staff for their dedicated
efforts to get this complex new system operational in time.
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