Understanding Data and MC Analysis Differences
Explore the differences between data and MC analysis through a series of elog notes and images relating to total charge distribution, trigger conditions, and effects of HV changes on events collected in a scientific experiment setting. Gain insights into variations in event rates, trigger conditions, and equipment adjustments impacting event characteristics.
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Presentation Transcript
Trying to understand the differences between data and MC Analysis-elog note n. 5 (A. Capone, P. Fermani) All events Total charge distribution (ADC channels) for the same OM in May and in July Run 0499 Run 1090 22/01/14 KM3 Steering Committee - LNS - Antonio Capone 1
On 22 June there is a change ! Run 499 08/05/2013 Run 760 Run 840 Run 845 Run 847 22/06/2013 Run 1011 Run 1050 Run 1090 Run 1409 30/09/2013 Total charge distribution (ADC channels) for OM=1 from May to September 22/01/14 KM3 Steering Committee - LNS - Antonio Capone 2
Since 22/06 Q trigger at L1 is set if has Q>500 Before run 846 the L1Q trigger condition was Q>1000 22/01/14 KM3 Steering Committee - LNS - Antonio Capone 3
Total Charge distribution for events collected with Random trigger (magenta) and for all events (black) G. De Bonis Analyss-elog n. 6 22/01/14 KM3 Steering Committee - LNS - Antonio Capone 4
Info from the NEMO-elog The Q>500 change has increased the L2Q trigger (plg2 SC+Q) that, after the change, has the same rate as the L2 SC+SC, so in the total charge distribution, for "all events" we find the two kind of events with the same rate. T. Chiarusi NEMO-elog 666 22/01/14 KM3 Steering Committee - LNS - Antonio Capone 5
One effect of the H.V. change Analysis-elog note n. 7 (G. De Bonis) Since run 847, not only the trigger change but also the OM HV have been changed: in general decreased. Before this change sometime we saw very long events ("fragmented"). saturation Very long events ! Run 499 Run 1390 ! ! ! Figure,2, ,Waveforms,of,the, long ,hits,from,run,1390,(each,color,denotes,a,different,hit).,Only,linear, scale,is,shown,because,there,are,no, very,long ,hits.,, ! Figure,1, ,Waveforms,of,the, long ,hits,from,run,499,(each,color,denotes,a,different,hit).,Top:,log,scale, for,the,X,axis;,Bottom:,linear,scale,for,the,X,axis., Very,long ,hits,are,present.,, ! ! !! After the HV change no more "saturation" and no more "very long events" 22/01/14 KM3 Steering Committee - LNS - Antonio Capone 6
