What Does the CRT Do?

Adding the CRT to Run Control

Monitoring the CRT's Performance

  1. Watch out for alarms from your current partition! The CRT can trigger an alarm if its Fragment size ~= data rate gets too small.
  2. From the Main Run Control window for any partition, open the Trends window TODO: picture
  3. At the top-right corner of the Trends window, open the Selection Tool window TODO: picture
  4. There is a list-tree of DAQ "nodes" on the left side of the Selection Tool window. Click on the black arrow next to CRT to expand the tree into a list of CRT board readers. TODO: picture
  5. Click on crt0 and drag down to crt4. All 4 CRT board readers should now be selected.
  6. You can select a metric to view in the pull-down window to the right of the list tree. The default metric, Average_Fragment_size_double, is good for monitoring the CRT because it is proportional to the number of CRT boards that were included in an average data event. Click the Add button to get the metric you've selected to plot for all 4 CRT board readers.
  7. Watch for size-48 and size-0 Fragments on the plot at the bottom of the Selection Tool. Size-48 Fragments seem to generally be empty for all systems I've worked with.
  8. If any CRT board reader's Average_Fragment_size_double goes below 48, contact CrtExperts!
  9. Check out the beginning of CRTAdvancedOp to learn one more test for whether we can at least trigger on the CRT. The expert might ask you to do this.

How to Get Help

  • Contact the CrtExperts by phone or on Slack according to the severity of the problem.
  • If there is a CRT-related problem when running, please mention the CRT in the end-of-run comments window. This will help CrtExperts track down the problem later.
  • Write CRT messages on the e-log (TODO: link). There might be useful information about recent CRT maintenance there too.
  • During beam data-taking, the CRT is not essential to our trigger conditions. So, if the CRT has problems and no other systems are affected, please keep running and send a Slack message to the CrtExperts. If the CRT is affecting other components while beam is available, please ask Rob about starting a new run without the CRT out of the run and contact the CrtExperts.
-- Main.anolivie - 2018-11-02
Edit | Attach | Watch | Print version | History: r4 < r3 < r2 < r1 | Backlinks | Raw View | Raw edit | More topic actions...
Topic revision: r1 - 2018-11-02 - AndrewPaulOlivier
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    CENF All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2022 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
or Ideas, requests, problems regarding TWiki? use Discourse or Send feedback