Minutes-6-12-2014

June 12, 2014 FDC+CDC meeting

Agenda

1. Gas system
2. DAQ (Beni)
3. CDC status (Mike)
4. Engineering (Bill)
   • new cathode measurements [1] (Lubomir)
5. Electronics (Chris, Nick)
6. Readiness review (Beni, Lubomir)
   • Wiki Page
7. Other

Instructions for Bluejeans meeting connection

FDC meeting ID: 290664653

Minutes

Participants: Curtis (CMU), Bill, Beni, Dave, Eugene, Chris, Nick, Simon, Sergey Furletov, Fernando, and Lubomir (JLab).

Gas system

- The new gas control box has arrived and yesterday Scott replaced the faulty one at the FDC mixing tank. When doing this Scott was following the settings in the procedure where the channels for CO2 and Ar are swapped. However, as it turned out after the meeting, he also followed the cables on the back of the box and swapped them too, in result the gas mixture didn't change (there was some confusion during the meeting).

- Several times during the past week the HV tripped both in FDC and CDC, and we think it could be correlated with the change of the atmospheric pressure. We need to measure, record and archive the absolute pressure since the gas properties scale as E/p (filed/pressure). Dave will look for solution.

- The rates of filling the FDC and CDC mixing tanks are very similar now but they are supposed to be 0.6 vs 0.8 l/min. We suspect some leakage, maybe in the relief valves. We are going to do some tests tomorrow with Scott to figure this out.

DAQ

- Beni got the DAQ working! Bryan Moffit helped him. It is working now with 4 CDC and one FDC crate. In the FDC crate in addition to the "slow" F1TDCs, Beni has also one fast F1TDC for the trigger scintillators.

- Beni's plans: taking data with the CDC and setting the readout window, then doing the same with the FDC, then increasing the number of the crates.