[Hallb-engineering] (no subject)
jacobsg at jlab.org
Tue Oct 27 12:24:48 EDT 2009
DCGAS is back online at 1210 hrs. The system did not recover normally
after the power outage due to a bad transducer and controller on R3. The
failed components have been replaced and the system in now operational.
Because the gas flow was off for an extended period of time, air has
contaminated the detectors and they require purging. Since the extent of
the contamination is unknown, so is the purge time.. The O2 absorbs
electrons and results in smaller amplitude signals. I am guessing ~6
hours, but this time could be longer or shorter for some sectors than
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(email) jacobsg at jlab.org
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