User name R. Michaels
Log entry time 03:59:58 on June 8,2004
Entry number 124938
This entry is a followup to: 124932
keyword=detector check(2) - note T0 change !!
From a long cosmic run 1041. Summary: Detectors look ok,
with two exceptions:
1) L-arm S2 TDCs -- several channels are completely empty.
2) R-arm S2 TDCs -- several channels are nearly empty.
This is because the time offset changed and went out of TDC range.
**NOTE** This may affect tracking !!
Looking at VDC TDCs I see the shifts from previous experiment:
L-arm T0 went from 1750 to now 1900. That is 150 chan = 75 nsec
R-arm T0 went from 1800 to now 1850. That is 50 chan = 25 nsec.
The L-arm shift seems a bit too large. Maybe something wrong ?
Note that retiming signal (RT) is (and should be) unplugged.
The ADC gate timings on both HRS were checked & ok today.
The ADC gate is also wider than before: 300+ nsec.
We can probably live without S2 timing info, but it might be better
to move these into a TDC 1877 with bigger dynamic range (2 usec).
In spite of the low efficiency due to the triggers, I can see
data in S2, VDC, and leadglass. There was a small problem at
first that D.evtypebits was zero. This was due to a timing
shift which was slightly outside the cut window. I adjusted this
in THaDynData. I have also updated the database file db_P.dat
(note the "P"). This is for the ParityData class. The ADC and
TDC locations for the HAPPEX detectors is set. See fig 1 for
ADCs and TDCs for the HAPPEX e-cal detector.