We looked at the time difference between phototube pairs, for events where two phototubes fired. We would like to confirm that the total time difference between two readings is not too large.
In the figure below I plotted the time difference for Phototube #1 - Phototube #2 Phototube #2 - Phototube #3 . . . for run #1227.
One can see that the total time difference for a series of pairs does not exceed ~10ns
The script may be found under: /adaqfs/home/adaq/apex/ipom/cer/cer_2pmt_calib.C
time difference between phototube pairs