[d2n-analysis-talk] BB cer TDCs

[posik at jlab.org]

Hi Brad,

  So I was looking at the multi-hit Cerenkov TDCs. The first thing that I
did was to just plot

DBB.BBcerT03, This is the sum of all the indexed TDC #3
DBB.BBcerT03[i], where i goes from 0 to 10

These plots can be seen in TDCvHit_pmt3_1849.png. The black is the indexed
sum, the red is the 0th index.

Another way I seen that you looked at the TDCs is to plot it as follows:

DBB.BBcerT03[Ndata.DBB.BBcerT03-i] where i runs from 1 to 10 and
Ndata.DBB.BBcerT03 is the TDC chan that got a hit. In the plot
below(TDCvHit_pmt3_1849_ndata.png, The histo with
DBB.BBcerT03[Ndata.DBB.BBcerT03-10] is the blue and as i approaches Ndata,
the peaks approach the black histo which is the sum of the indexed TDC.

So when using TDC cuts do I want to make cuts using the TDC[0,1,ect] as in
the first plot or do I make cuts to each of the TDC[Ndata,Ndata-1,ect] as
in the second plot?

Thanks
Matt
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