Revision as of 18:25, 27 August 2015

August 27, 2015 Drift Chamber meeting

Connection

Electronics
- CDC/FDC noise studies (Fernando) [2], [3],[4],[5]
CDC update (Mike, Simon, Beni)
FDC update (Luke,Lubomir)
- fall2014 vs spring2015 offsets
- Tagger Tests with Fe source: [6][7][8]
Engineering
Other

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 == Electronics ==
-- Fernando studied the noise on the CDC and FDC together using two differential probes: see scope pictures linked in the agenda. First picture shows the noise level in the two detectors is similar; FDC looks better but not by a lot.
+- Fernando studied the noise on the CDC and FDC together using two differential probes: see scope pictures linked in the agenda. First picture shows the noise levels in the two detectors are similar; FDC looks better but not by a lot. The second and third pictures show typical cosmic signals with correct timing. Last plot discussions - occasionally there are long tails in the CDC signals (~5 usec).
+The signals are still low enough (~100mV) so this is not a saturation effect (Fernando). Most likely it comes from ion tails (Lubomir), however it is not clear why it happens mostly in the CDC, is the ion-cancellation different in the two detectors?
+- Nick: all "noise-reducing" elements from the CDC were removed. Tim is informed about that but need to decide about installation of an additional Al-foil target before inserting the target back. Nick replaced one LV module in the CDC; it was giving high current without any load. This is the second problematic LV module, the first one had different issue.
+- The PR for 100 spare pre-amps was approved.
 == CDC update ==