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PHOS DQM

PHOS DQM. Yuri Kharlov DQM meeting 15 Jule 2011. PHOS status. PHOS is correctly described at the DQM Twiki https:// twiki.cern.ch/twiki/bin/view/AliceEVE/EVEDQMShifterInformation PHOS description was added to AMORE

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PHOS DQM

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  1. PHOS DQM Yuri Kharlov DQM meeting 15Jule2011

  2. PHOS status • PHOS is correctly described at the DQM Twikihttps://twiki.cern.ch/twiki/bin/view/AliceEVE/EVEDQMShifterInformation • PHOS description was added to AMORE • Questions and answer for the DQM shift trainees were provided at https://twiki.cern.ch/twiki/bin/view/AliceEVE/EVETEST • PHOS DQM plot behavour was finally understood by the PHOS experts, instructions were properly updated.

  3. PHOS DQM plot Number of hits in PHOS reflects mainly the noise status: almost all hits come from noise. Change in the noise status can be an indication or wrong FEE initialization. For a long time DQM shifters worried about a double peak at the PHOS DQM plot. In June 2011 it was noticed that double peak is correlated with event size oscillations (next slide). PHOS noise depends on readout rate. A nature of the double peak was understood, it is not a reason to call PHOS on-call expert anymore

  4. Trend plot of PHOS event size In June 2011, ALICE has operated with two trigger classes with different L2a rates: 236 s for rare events (50-100 Hz) + 3 s for min.bias trigger (1000 Hz). This periodical trigger structure is reflected in the PHOS event size.

  5. DQM open issues • Provide Thresholds and Alarms (ACORDE, PHOS, PMD, SDD) Working on it. • Verify and state if your quality flag is meaningful For the moment PHOS does not fill the quality flat. To be developed

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