[Clas12_rgb] analysis of timelines and proposition of runs to calibrate
silvia at jlab.org
silvia at jlab.org
Tue Feb 18 09:28:38 EST 2020
Dear all,
I have looked at the timelines for the various subsystems, made slides
with the relevant plots and my own proposition of runs to calibrate.
The slides are here:
https://clasweb.jlab.org/wiki/images/9/94/Timeline_spring_check.pdf
My conclusions, for which I'd like the feedback of the detector contact
people, are:
- we need to calibrate FTOF for 6223 6286 6351 6420 6546, and then as a
consequence recook and redo timing calibrations for the same runs for
CTOF, CND, FTCal, etc.
- FTCal energy calibration is drifting, I don't know if the 5 runs
mentioned are enough or not
- CTOF needs also run 6189 to be recalibrated.
- ECal looks very good timing wise, while the SF drifts by about 4% from
the start to the end of the run.
- There are some weird features concerning the CD; jumps in reconstructed
vertex position, and a sudden increase in particle rates per trigger in
the CD from run 6420, the first run at 10.2 GeV. The rise is too high, in
my opinion, to be physics related, and there is no change in the FD rates.
I didn't include the CND in this analysis because we think there may be
issues with how the monitoring plots were filled, and we are discussing
with the monitoring crew.
Please let me know your comments/suggestions.
Best regards,
Silvia
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