Revision as of 17:11, 18 December 2014

December 18, 2014 FDC+CDC meeting

Connection

CDC update

amp vs n

time vs n

time

time
- Early straws are from HVB C8: roc 28, slot 15, channels 48-71; ring 8 straws 53-60, ring 9 straws 62-69 and ring straws 61-68
FDC update (Lubomir, Vlad)
- latest runs with no field: Vlad's plots, FCAL&TOF trigger, drift time for package 1 and 4
Other: electronics, engineering

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 = Minutes =
-Participants: Naomi (CMU), Beni (Switzerland) Mike, Dave, Curtis, Chris, Simon, Vlad, and Lubomir (JLab).
+Participants: Naomi (CMU), Beni (Switzerland), Mike, Dave, Curtis, Chris, Simon, Vlad, and Lubomir (JLab).
 == CDC update ==
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 - Mike: trying to explain the factor of 4 higher gains (both with cosmics and with beam) now as compared to the tests at CMU. Mike found that the CO2 gas factor is now 0.77 instead of the recommended 0.74 but this could not explain the above factor of 4. HV change (Naomi) is also very unlikely since you need at least 150V for that. Most likely the factor of 4 is coming from the electronics/analysis and Naomi is now setting up the DAQ with the prototype straws to figure this out. Beni: when the CDC was in the EEL126 it was tested only with a scope by Anatoly, but not with the DAQ.
-- Naomi discussed some plots (linked above) showing that the signals from 24 channels (one connector) are coming earlier than the rest by about 30-40ns, as
+- Naomi discussed some plots (linked above) showing that the signals from 24 channels (one connector) are coming earlier than the rest by about 30-40ns, as seen from the fADC125 data. NO idea what's the reason for that.
 == FDC update ==