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User name V. Sulkosky
Log entry time 12:36:47 on October24,2007
Entry number 209443
This entry is a followup to: 209404
keyword=Added Delay to S1 (RHRS)
Checked the S1 and S2 signal that arrives at the Retiming module. For
cosmics the delta-T was typically between 12-15 ns, which is reflected
in the TDC spectra for cosmics.
The delta-T between cosmics and beam is about 14 ns. Hence with beam,
There is only a few ns to spare between the S1 and S2 timing, and it's
likely S1 can and does make the self-timing.
I have added an additional 10 ns delay to the S1 cable going into the
RT module. So the delta-T between S1 and S2 with cosmics is at least 21 ns. This should give us about 7-8 ns of breathing room with beam.
The self-timing of S2-R will need to be checked with beam.