Hi,
While I was checking some calibration thing, I wanted to know if the old
BB calibration holds for the new data. In that purpose, I wrote an
application CheckBbCalib, you can get it in brahms_app/do_app/bb
It works this way:
./CheckBbCalib -i <some data file> -r 3994 -H bbCal.root -e 10000 -M <SQL server>
The data file should of course contain some raw BB data and you should be
able to connect to a database (rcas0005.rcf.bnl.gov is the official
SQL server).
The histogram file contains 3 histos:
a 2d histo with calibrated ADC vs tube number
(1-44 for left, 51-86 for right)
a 1d histograms with hit statistics when calADC > 0.7 MIP energy and
10 < TDC < 4000
a profile showing delta Time vs tube number
This delta time is defined as
timeRef - time
where
timeRef : calibrated time of the reference tube
time : calibrated time of a given tube
(picked up the time determination procedure in Yury's thesis)
As far as I could see, the equations written in this thesis and
in BrBbRdoModule disagree but maybe I misinterpreted the parameter
deltaTdc (before or after slewing?)
Unless there are some errors in this application, the old calibration
looks ok for the ADC gain 0 but wrong for the timing. But BB experts
should maybe take a look at the way I define delta Time in the
application.
You'll find an attachment showing what I get for run 3994.
Ciao
Djam
--
Djamel Ouerdane ------------------------------------------o
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