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MCH KNOWN ISSUES#

  • In SYNTHETIC runs, MCH global quality may depend on the replay configuration

    • in p-p replay (500 kHz) : MCH run global quality is expected to be good. If quality is bad or medium, notify the on-call via a logbook entry
    • in PbPb replay : MCH run global quality is expected to be good. If quality is bad or medium, notify the on-call via a logbook entry
    • other replay settings : MCH run global quality may oscillates between good and bad. If quality is bad or medium, notify the on-call via a logbook entry

  • In TECHNICAL runs, MCH global quality depends on the DCS state of MCH

    • if MCH state is READY : MCH global quality should be good. If MCH global quality is bad a notification via a logbook entry is enough.
    • if MCH state is BEAM_TUNING (BEAM_TU) or STANDBY_CONFIGURED (STDB_CO): MCH global quality is expected to be bad. Only the "Decoding errors" is expected to have a good quality; if this is not the case a notification via a logbook entry is enough.

  • In COSMICS runs, the low number of tracks makes it difficult to compute the efficiency for all detection elements in each cycle. Hence oscillations between good and bad status should be expected.

    • if Bad Preclusters quality: Bad Mean Efficiency vs DE(B) and Mean Efficiency vs DE(NB) show multiple bins below threshold value. This is a known issue, no need to notify.
    • if the global quality is bad continuously for more than 1 hour, please make a notification via a logbook entry.

  • FLP Infologger

    • QC plots have been disabled and will generate some errors about not-found plots that can be ignored, for instance :
      • Requested resource does not exist: ali-qcdb.cern.ch:8083/qc/MCH/QO/DecodingCheck/1709911754085/PeriodName=LHC24aa/RunNumber=548050/
      • Requested resource does not exist: ali-qcdb.cern.ch:8083/qc/MCH/QO/PreclustersCheck/1709911754085/PeriodName=LHC24aa/RunNumber=548050/
      • Requested resource does not exist: ali-qcdb.cern.ch:8083/qc/MCH/QO/DecodingCheck/1709911754085/PeriodName=LHC24aa/RunNumber=548050/