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User name Bob / Kurtis
Log entry time 17:00:50 on July 1,2010
Entry number 329311
keyword=new trigger T6, and timing adjustments
Working with Bogdan too ...
The R-HRS Gas Cerenkov was brought to L-HRS and AND'd with
the T4. Reminder, T4 is the coinc. of S2m-L and S2m-R.
To check the timing, we made T4 be (temporarily) the "or".
This signal is 80 nsec wide and we put the gasC-R in the
middle of it. This is trigger T6.
Note, T6 will be the "gold plated" trigger with (hopefully)
little jitter and no need for re-timing, says Bogdan.
Next, we checked that T6 arrives at the trig. super (TS)
40 nsec later than T3 (R-HRS S2m trigger). Since had previously
aligned all triggers T1 - T5, we now need to delay T1 - T5
by 40 nsec. Kurtis will be left with the task of organizing
these delay cables.
Meanwhile, this means reducing the gate delays by 40 nsec.
This was easy to do with the gate generator that feeds all
the ADCs except gasC-L and we did it. For gasC-L it will be
necessary to delay the analog signals by about 40 nsec.
Before any timing adjustments of T1, Kurtis and I checked once
again the timing of the gate for gasC-L. The gate is 80 nsec
wide, and the middle of it occurs 56 nsec before the start of
the gasC-L analog signal. Bogdan said this should be 60 nsec,
so I guess it's pretty good, and provides a starting point.