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CPV#

Technical runs#

If you see "Number of entries has not changed in the past cycle" but run is still ongoing then most probable reason is that PHS bacome busy. You can check with ECS shifter and inform the on-call if he is not informed yet. If PHS is not busy but you see this message then inform the on-call.

Message "Cold (hot) 3G cards (N/X)" is tolerated if plots look like reference.

Good plots: alt text

The plots represent number of digits seen in each channel. It should be more or less populated. In case when it is very different from reference please inform CPV on-call.

[QC on EPN] Error occurance#

Good plot:

alt text

If plot is not OK then put a log entry and call the oncall during morning and afternoon shift. No need to call at night if there are no other issues. No need to put bad flag for run if there are no other issues.

Minimal duration after SOR before taking any action required by these instructions: 10 min

Known issues#

  • In PEDESTAL runs QC plot "Pedestal sigma distribution M3 is bad". Acording to expert, noise conditions in CPV depend on general environment in ALICE, therefore, from time to time CPV pedestals can become wider which is reflected in QC-CPV calibration run plot with the message "Number of bad pedestal sigmas in module M3 (sometimes in M2) is larger than the upper limit". This is a known issue, can be ignored, but make a log entry when it happens. See: https://ali-bookkeeping.cern.ch/?page=log-detail&id=45015

  • In PHYSICS runs Red messages on QC Plot "Digit Map in M4". Problem with high voltage is preventing this module from running normally. Experts are trying to recover. No need to report. Run quality must be setted to "good" if there are no problems with other modules. See: https://ali-bookkeeping.cern.ch/?page=log-detail&id=53523. Quality aggregator is also expected to show bad quality for Digit oocupancy check and CalibDigit amplitude check.