[d2n-analysis-talk] TDC/ADC entries

posik at jlab.org posik at jlab.org
Tue Mar 30 09:59:02 EDT 2010


Hi Brad,

   So I am now looking at the re-timed multi-hit TDCs as cuts on the BB
cerenkov ADCs and I just want to make sure that I understand this
correctly. I checked all of my Ndata.variable_name that I get from my
code with what I would get from using T->Draw("Ndata.variable_name")
and the hits and entires I see in each variable agree. What I noticed
is that when I go to plot say the cer TDCs, I loop over all hits on
each PMT for each event. What I find is that the entires in the TDC
histograms are greater than the number of events that I am replaying.
Is this because for event i, it is triggering more than one TDC (ie if
the particle were to strike the corners of four adjacent mirrors)? 
Below is a plot of the re-timed TDCs with some of the TDCs having more
entries than events. This is from run 2060 and I replayed 100k events.

Thanks
Matt
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