Compton BCM

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User name rsholmes

Log entry time 11:33:05 on September 06, 2009

Entry number 288266

keyword=Compton BCM

I checked the BCM in the following Compton runs both in the French and
FADC DAQ. X means it looked bad, OK means it looked good, - means run
was not analyzed for that DAQ.

Run French FADC
18900 X -
18905 X -
18910 X -
18916 X -
18920 X -
18924 X -
18927 X -
18928 X -
18929 X -
18930 OK -
18931 OK -
18932 OK ? (FADC DAQ: Response seen but looks noisy and strange)
18933 X -
18934 OK - (Very short)
18935 OK OK
18936 OK -
18939 X -
18940 X OK
18941 X OK
18942 X OK
18943 X -
18944 X -
18945 X -

According to the Compton logbook, the runs in which the BCM looks OK in
the French DAQ are precisely those which are "photons only" and not
"photons and electrons" or "photons + electrons + coincidences".

So it may be something in the electron DAQ, or conceivably the electron
decoding, is corrupting the BCM data.

BCM looks OK in most of the FADC runs that have been analyzed but strange
in one; many runs have not been analyzed for FADC.

A copy of this log entry has been emailed to: paschke@jlab.org, souder@phy.syr.edu, camsonne@jlab.org