EMC

In general the global aggregator should catch the majority of issues that can occur during a PHYSICS run. Below is a description of all plots and what to look out for, as issues might not always be caught by the automatic checkers. If the aggregator or the instructions below indicate BAD quality for at least 2 cycles, please create a logbook entry and call the oncall immediately.

Number of triggers per Time Frame

good quality	bad quality
Trigger rate appox. const with minor fluctuations	Trigger rate dropping by several events / timeframe or to almost 0

• The number of physics triggers per Time Frame must stay constant while the run is ongoing. In case the number of trigger went down significantly call the EMCAL on-call.
• The number of trigger per Time Frame depends on the interaction rate and is currently expected to be around 17

Raw Data Error

Green: good quality	Red: bad quality

• This histogram shows what category of data corruption error is coming from which data link of the detector
• Ignore entries in the Minor ALTRO error column until further notice
• Call EMCAL oncall for errors in any other column

Payload Size/events

good quality	bad quality	empty

• If "Data OK" is shown, everything is fine.
• If some of the DDL presents entries that are larger than the others, a red message will appears: please call EMCAL oncall.
• DDLs 21, 22,36 and 39 are expected to be empty
• If the plot is empty, and EMCAL is included in the data taking, call EMCAL oncall.

Bunch minimum amplitude

good quality	bad quality

• One peak should be visibile for all supermodules around 0 if EMCAL is in data taking.
• If the peak moves to the range 20-50 "Min raw amplitude (ADC)" for any supermodule, or a second peak appears for any supermodule in that range , call EMCAL oncall
• If the plot is empty, and EMCAL is included in the data taking: please call EMCAL oncall

Occupancy plots: Acceptance losses

Missing acceptance (low-E)	Missing acceptance (high-E)

• In case counts in a certain detector segment stop increasing the corresponding segment stops sending data. The corresponding area must be visible in both plots: call EMCAL on-call

Calibration Cell Amplitude

• no instructions for the moment.
• If the plot is empty, and EMCAL is included in the data taking, call EMCAL oncall.

Cell Time

good quality	bad quality

• We expect a gaussian peak roughly centred at 0 and smaller gaussian like peaks from from pileup every 25ns. In such cases the data is OK.
• In case a second peak appears that has at least 10% of the main peaks amplitude, call the EMCAL on-call
• If the main peak deviates from 0 by more than 100 ns call the EMCAL on-call
• If the plot is empty or no gaussian like peak is present call the EMCAL on-call

Known issues

• Do not call EMC oncall during the night for QC plots related errors for non PHYSICS runs, unless a PHYSICS run is expected next.

• An empty region is expected near the bottom-right corner for CAL (Calibration) triggers.