[Hallb-engineering] (no subject)

George Jacobs 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 

George Jacobs
12000 Jefferson Ave.
Newport News, VA 23606

(cell) 757-876-0480
(pager) 757-584-7115

(email) jacobsg at jlab.org


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