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The Online Monitor Lizard Checklist

When you take a noise run, check the following plots. Interesting things should be put into the logbook.

Quick hints:
  • The links below take you to the plots for the current run. Statistics will improve as the run proceeds.
  • To see plots from old runs, click 'File Browser' under the picture of the lizard.
  • Use Opera or Chrome for best results.
  • To save plots, click the small down-arrow icon in the corner of the pane to save an image.

0. Make sure OM is keeping up with the data.

About 2 minutes after the first event is recorded, the Lizard should update. Make sure that the "Last Event Processed" window is up-to-date, with the current run number and a recent time stamp.

If it isn't, try reloading the web page. If that fails, try the OM troubleshooting page. If that fails, call the on-call Online Monitor Expert

1. Watch for bad data warnings!

corrupt_data.png

If you see this, call DAQ experts immediately.

2. Bad Channel Check.

http://ubdaq-prod-near2.fnal.gov/Lizard/#/tpc/mapccc/h_bad

Note in particular the total number, shown at the bottom of the view: "Shown: 122"
This value will replace the lazy_noise procedure.
Write this number in the log, appended as a comment to the entry you made for the run. Use the radio 'Value' and '(b) Reference' buttons to flip back and forth to the reference run to see which channels are changing. If many channels have turned bad suddenly (change is more than ~10 channels from the last run) then inform warm electronics experts.

3: Timing sanity checks

http://ubdaq-prod-near2.fnal.gov/Lizard/#/headers

This shows some timing information, indicating whether crate data is correctly synchronized. These plots should all look like vertical bands, centered on zero or -1. If this looks unusual, inform DAQ experts.

4. Occupancy Sanity Checks

http://ubdaq-prod-near2.fnal.gov/Lizard/#/tpc/mapccc/h_occupancy

All channels should look identical. If any cards are showing lower or empty (other than crate 1 cards 4,5,6,7 and crate 9 card 4) then we have a serious readout problem. Investigate and inform DAQ and/or warm electronics experts.

5. Poke around

There are lots of interesting plots you can get from the navigation bar on the left. Investigating all of the mapccc plots is worthwhile. You can click on channels to see what individual channels are doing. Learn about your detector! More thorough instructions on use of the Lizard are available from the main Wiki page.