History

NDOS Commissioning Meeting 2011/08/25¶

Attendance: Jon, Rafael, Gavin, Enrique, Carl B., Zukai, Minerba, Gary, Susan, Nick, Chad, Martin, Leon

Agenda:

Next Tuesday, Aug. 30, power will be turned off at the NDSB at 9 am for about an hour for grounding studies.
Leon:
- ~20 APDs have passed all tests at CalTech
- Looking at heatsinks on APDs removed last week, there is clearly a sealing issue with the heatsinks. Pulled a vacuum on the seals, and the vacuum failed in seconds (compared to hours seen on "good" APDs).
- Before the good APDs are sent back to FNAL, would like to address this sealing issue, in case the problem is on the APD carrier board (eg).

Plots from the past week look pretty good. There are some normalization issues with some of the plots that will be addressed soon.
"Good run" cuts investigated by Susan. One curious thing she's observed in many of the distributions is a dual-peak structure which seems to correlate with time; one peak corresponds to data collected after May, the other is from data collected before. She is investigating into the root cause.
The nearline is up and running; shifters can go to the nearline website to see plots from the last 24 hours. One concern is that data are being copied to the /data2/ disk only once per day; this needs to be done more frequently. Checklist plots are a work-in-progress.

Martin:
- code for alarms for FEB temp. and drive current in IOC is ready, and IOCs will be updated tomorrow morning.
- should the GUI be updated tomorrow too? That means that no DCS experts will be around over the weekend to deal with any issues. Jon: try it out tomorrow and see how it goes. If it looks to behave reasonably, then leave it for the weekend. Otherwise, wait until Monday.

Peter:
- Andrew N. was able to successfully take control of the NDOS DAQ and run it from the Ash River CR.
- Ron fixed the problem with external timing commands on DCMs. Jon will remove instructions to shifters to "force" ET.

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