Minutes-10-30-2014

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