Following the presentation by David Paneque at the previous CAL calibration meeting, and after discussion within CAL group, we recommend the list of modifications
- slide 2 - please read again the recommendations of Eric Grove posted at the CAL monitoring page
- slide 6
- for LEX8/HEX8 - change left boundary of fitting function to -2.5 sigma
- keep both methods (truncated average and fit) and set alarm on when the difference between two RMS valus is bigger than some limit (TBD)
- slide 7 - these plots are useless, to be removed; keep only the difference between pedestal for current run and the standard pedestal from database (used for data processing)
- slide 8 - add the list of outliers (RMS > 6.5). Trend the RMS for outliers and set an alarm on the unmebr of outliers
- silde 9 - chisq is difficult to use as it is too sensitive to statistics and model quality. It's better to use a difference between the fit sigma and trancated RMS
- slide 10 - not useful, becasue not sensitive to real changes
- slide 12 - useful, but would be better to express as a fractional difference (trunc - fit)/fit
- slide 13 - strange thing (in HEX8 and HEX1): truncated average has smaller RMS than fit - couldn't be correct
- verify and possibly modify truncation limits
- slide 15 - keep zoomed (right) plot with Y axis in log scale
- slide 16
- we seem to understand the reason for the difference between fit and truncated RMS
- it is becasue of shaped readout noise
- to decrease the effect significantly, let's apply the cut GemDeltaEventTime*0.05 > 100 us (may be more - depends on the event rate)
- also useful - to exclude periodic trigger events following the 4 range readout
- it is proposed to plot pedestal histograms for different bins in McIlwainL parameter (geomagnetic latitude)
- we seem to understand the reason for the difference between fit and truncated RMS
- slide 17 - increase the cut upto >500 LEX1 units for RPp and RMm histograms.
- slide 29 - plot LAC histogram in ADC scale (with binwidth =1 adc unit), connverted to energy using fixed coefficient - to avoid unphysical fluctuations.