[Xrayops] Suspect Nitrogen gas cylinder

APS Experiment Hall X-ray Operations Problem List xrayops at mailman.aps.anl.gov
Fri Dec 14 16:36:31 CST 2007

Yesterday, we experienced strange behavior from our ion chamber  
readings on 1-ID and 1-BM that was traced to a bottle of nitrogen gas  
from Airgas that was hooked up earlier that day.  The readings in the  
ion chambers rose dramatically (on both beamlines) for a fixed set of  
operating conditions.  We expect the gas cylinder was contaminated in  
some way and are following up with Airgas.  We do not know if any  
other "bad" nitrogen cylinders were delivered to the APS, but users  
of recently delivered nitrogen should be aware of this situation.

Dean Haeffner

Dean R. Haeffner
Argonne National Laboratory     630 252-0126 (phone)
Advanced Photon Source          630 252-5391 (fax)
Bld. 431-A008
Argonne, IL 60439-4856

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