Each run of more than 100000 events should be flagged by the muon desk shifter ([[DataQualFlag][Shift Online Data Quality Flags]), to indicate whether the data is usable by each segment (MDTBA, MDTBC, MDTEA, MDTEC, RPCBA, RPCBC, TGCEA, TGCEC, CSCEA, CSCEC):
  • GREEN: At least 90% of the detector segment is performing well, has nominal operating conditions (LV, HV, Gas), and the data looks good
  • YELLOW: At least 90% of the detector segment has nominal operating conditions (LV, HV, Gas), but it looks like it might have bad calibrations, and could be fixed by reprocessing.
    In the case of muons, a yellow shift online flag should be put if the detector situation was unclear for reasons other than low statistics, typical examples are if the LV, HV etc. status in DCS was UNKNOWN due to a OPC server down or such.
  • BLACK: The segment was disabled or no data was taken from it
  • GREY: Data quality cannot be assessed (e.g. if there are not enough statistics)
  • RED: Bad data quality or no data is received from at least 10% of the detector, or detector was in STANDBY state (e.g. with HV not at nominal level)
The flag can be entered for each segment for each luminosity block separately. So a typical run might be flagged red at for some luminosity blocks for some segments if beam was being ramped, but then green later, after stable beams flag was set and the detector HV was ramped up to nominal.

Please enter a comment to explain your choice of flag, unless you are flagging green.

Procedure to entering Flags to the Database:

To set the muon desk shifter data quality ('SHIFTONL') flags for recent runs:

  • Go to the "Last runs in the ATLAS partition" section of the MuonSpectrometerWhiteBoard. Check the run you want is listed, and for that run click on the boxes (any of the boxes will do) in the SHIFTONL column. This will open a new browser window with the DQ flagging interface.
  • Next you must set the colours you want, before then saving changes to the database. You can set a flag colour for e.g. MDTBA, by clicking on the column header titled 'MDTBA'; alternatively you can set the same flags for multiple segments by clicking on one of the higher-level headers, e.g. 'MDT' or 'Muons'. Clicking on such a column header brings you to a new page, where you must select the colour you want to flag. You should also enter a Luminosity Block range (or leave range boxes blank if you're flagging the whole run with the same colour), and you must enter a comment to explain the choice of flag (unless you're flagging green).
  • Next click 'Save Change' (but this button does not actually save the change into the database). You will be taken back to the page from which you can click on a header again, to enter a flag for a different detector segment or lumi block range.
  • Once you've selected flags for all the subsystems and luminosity block ranges in the run, click on the 'UPDATE DB' button. You will then be asked for a password, enter 'Muons', and then the new flags will be stored in the database.
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Topic revision: r1 - 2011-04-13 - MarcellaCapua
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