Difference between revisions of "Minutes-7-24-2014"
| Line 13: | Line 13: | ||
FDC meeting ID: 290664653 | FDC meeting ID: 290664653 | ||
| − | |||
| − | |||
= Minutes = | = Minutes = | ||
| Line 29: | Line 27: | ||
Fernando wanted more tests with more cards and HV modules to see if this is a problem with a particular module/HV crate or a common feature of this CAEN system. | Fernando wanted more tests with more cards and HV modules to see if this is a problem with a particular module/HV crate or a common feature of this CAEN system. | ||
| − | - Mike found that for the channels with no signals in the fADC but visible on the scope | + | - Mike found that for the "problematic" channels (with no signals in the fADC but visible on the scope) one can actually see something (noise or signal) in the fADC but with a huge DAQ offset of 0xd000. It is not clear yet what is the quality of the signals. |
== FDC update == | == FDC update == | ||
| − | - The first track going through all the 24 chambers is shown above. It was obtained with Beni's horizontal muon trigger. So far within 4 hours run we found only two such events. There are few more with muons partially crossing the FDC system. Still, this one event help a lot to fix the geometry, the translation table and some bugs in the code. Important is that we see signals from all the cells and all the planes within a cell, upper, down strips, and a wire, crossing at the same point, meaning we have 100% efficiency. | + | - The first track going through all the 24 chambers is shown above. It was obtained with Beni's horizontal muon trigger. So far within 4 hours run we found only two such events. There are few more with muons partially crossing the FDC system. Still, this one event help a lot to fix the geometry, the translation table and some bugs in the code. Important is that we see signals from all the cells and all the planes within a cell, upper strips, down strips, and a wire, crossing at the same point, meaning we have 100% efficiency. The space points in the plot are the avalanche positions obtained from the cathodes only and fitted with a 3d line. Next step is to use the drift time information to find the actual hit positions. |
== Electronics == | == Electronics == | ||
| − | - | + | - Chris and Nick worked on the CDC testing the "problematic" channels. Most likely the problem is in the 3M connector (but could be somewhere else), so Chris is going to exercise to see if one can open and fix such connector. |
| − | - | + | <!-- |
== Engineering == | == Engineering == | ||
Revision as of 12:53, 25 July 2014
July 24, 2014 FDC+CDC meeting
Agenda
- DAQ (Beni)
- CDC status (Mike, Beni)
- FDC status First Track through all packages (Lubomir)
- Electronics (Chris, Nick)
- Cathode scan (Luke)
- Other
Instructions for Bluejeans meeting connection
FDC meeting ID: 290664653
Minutes
Participants: Sean (NU), Luke, Chris, Mike, Simon, Beni, Fernando, Eugene, and Lubomir (JLab).
DAQ
- Beni: DAQ doesn't want to crash now, so it's difficult to troubleshoot the problem. Will start big run over the weekend with the new (nonflammable) cable to record the trigger time.
CDC update
- Beni studied the CDC noise once again (all the results are linked above): using a scope on one channel (#4 connector C6) with a stand alone DC power. He made measurements in different conditions: turning on/off LV/HV the power for the crates itself and also ramping the HV. He was looking for is 60Hz noise and 200kHz bursts with tens of MHz within the bursts. The conclusion: the 60Hz comes when powering the south HV supply (connected to the card). The 200kHz bursts come when rumping up the HV and stay when the HV is up. Fernando wanted more tests with more cards and HV modules to see if this is a problem with a particular module/HV crate or a common feature of this CAEN system.
- Mike found that for the "problematic" channels (with no signals in the fADC but visible on the scope) one can actually see something (noise or signal) in the fADC but with a huge DAQ offset of 0xd000. It is not clear yet what is the quality of the signals.
FDC update
- The first track going through all the 24 chambers is shown above. It was obtained with Beni's horizontal muon trigger. So far within 4 hours run we found only two such events. There are few more with muons partially crossing the FDC system. Still, this one event help a lot to fix the geometry, the translation table and some bugs in the code. Important is that we see signals from all the cells and all the planes within a cell, upper strips, down strips, and a wire, crossing at the same point, meaning we have 100% efficiency. The space points in the plot are the avalanche positions obtained from the cathodes only and fitted with a 3d line. Next step is to use the drift time information to find the actual hit positions.
Electronics
- Chris and Nick worked on the CDC testing the "problematic" channels. Most likely the problem is in the 3M connector (but could be somewhere else), so Chris is going to exercise to see if one can open and fix such connector.
