Revision as of 17:02, 30 October 2014

October 30, 2014 FDC+CDC meeting

Connection

1. Instructions for Bluejeans meeting connection
2. FDC meeting ID: 290664653
3. To join via a Web Browser, go to the page [1] https://bluejeans.com/290664653.

Agenda

1. DAQ (Beni)
2. Electronics (Fernando)
3. CDC update (Mike)
4. FDC update (Vlad, Lubomir)
   • Chiller status [2]
   • FDC survey
   • Strip calibration
5. Commissioning Wiki Page (all)
6. Other

Minutes

Participants: Naomi (CMU) Eugene, Fernando, Simon, Dave, Tim, Chris, Nick, Mike, Sean, Beni, Cody, Sergey and Lubomir (JLab).

FDC chiller

- The chiller failed again on Tuesday (see plot attached): at 8:23am the Fluorinert temperature started increasing (blue), when it reached 25C the software interlock (green step function) stopped the LV. The temperature increased up to 48C then went down to 20C, by itself, by the time we got down in the Hall at 9:15am. The temperature change was real since it was followed by a change of up to 2 Pa in the gas pressure in the chambers (brown).

- Dave: the chiller showed initially "11: Reservoir High Temp" then " 21: Controller Error FLT T2 Sensor". After some troubleshooting we were not able figure out if the sensor or the controller has a problem, but another problem appeared: "04: CPRSR Overheat FLT". At this point, the facility people found that the compressor failed again. The original compressor failed and was replaced 2-3 months ago. Dave talked to the SMC representative: the Controller/Sensor error won't go by itself, most likely it will show up again after the compressor is fixed. Eugene agreed to order a new controller and a sensor. The parts will be here on Monday.

- Tim: facilities are replacing the compressor now. The representative from Hermitage Automation is coming at 2pm to look at the unit. We will continue troubleshooting once the compressor is replaced.

- Lubomir will discuss with Hovanes possibilities for powering off the chiller in case of a failure like this using epics.

DAQ

- Cody made changes in the f125 firmware and now the DAQ is running without any crashes or errors! All the CDC and FDC crates are read out, but right now there's no information in the FDC crates.

- Beni: David Lawrence found that the BCAL and CDC information is shifted by one event. This was later fixed by including one additional reset in the readout list.

CDC update

- Mike: CDC HV channels that were put on 100nA and 1uA scale both tripped during the photon beam alignment. Now both HV channels were switched to 10uA scale.

- Mike has a GUI that monitors the CDC rates online, using independent trigger-less readout of the crates. Mike is ready to work on a similar GUI for the FDC.

FDC update

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Commissioning

- Simon did a plugin for the FDC online monitoring, showing the strip and wire profiles as discussed last time. Wire profiles were OK, but not the strips because of some noisy channels (due to wrong dac values for example). Lubomir continued working, adding more information to the code using position and timing correlation between the two cathodes and the wires to filter out the noise. While the position correlations are OK, there are inconsistencies with the timing correlations. Due to the lack of the trigger time (not yet implemented in JANA/DANA frame) Lubomir tried to synchronize the wire timing using the f125 timing information.

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