[d2n-analysis-talk] BB cer TDCs

[MATTHEW R POSIK]

Ok, I will try this, but I don't think it is the Ndata.DBB.BBcerT%02d cut
that is making the cerenkov sum vanish when I "OR" the TDCs. I tried a
variety of things and one was using just DBB.BBcerT%02[0] TDC hits and when
applying the "OR" ed beamline side TDCs the sum still look ok, but when I
applyed the "OR" ed farside (farthest from beam) TDCs with out the beamline
side TDCs, the cerenkov sum vanished.

  However, since BB.cer.asum_c was only a single element, I did not use an
index on it, so I guess I could try BB.cer.asum_c[0]. But then I do not know
why using the "OR" ed BB.cer.t[ ] TDCs on the unindexed chernkov sum would
work?

-Matt
On Fri, Jan 29, 2010 at 12:03 AM, Brad Sawatzky <brads at jlab.org> wrote:

> Hi Matt,
>
> There are only 'Ndata.DBB.BBcerT%02d' hits in the DBB.BBcerT%02d[]
> array.  If you index out of bounds you'll get weird results.
>
> Modify your loop so that you build your cut this way:
>  for(nhit=0; nhit<Ndata.DBB.BBcerT%02d; nhit++) { ... }
> Note that this will not add any cut if there are no hits in that
> particular TDC channel.
>
> Also, be very careful that you add an explicit index to every array type
> variable in all of your cuts (and that includes arrays with only one
> entry).
>
> -- Brad
>
> On Thu, 28 Jan 2010, posik at jlab.org wrote:
>
> > Hi All,
> >
> >  So I was playing around with the Big bite TDCs today and forming a cut
> > that incorporates all the multi-hits for each TDC, so that I can apply it
> > to the cerenkov ADC signals.
> >
> >   The multihit TDC cut loops over all tdc-hits and accepts only a certain
> > timing peak. ie
> >
> >     for(Int_t nhit=0;nhit<6;nhit++){ //loop over multihit TDC
> >                if(nhit==0){
> >
>  tdc_ct=Form("(DBB.BBcerT%02d[Ndata.DBB.BBcerT%02d]<%f&&DBB.BBcerT%02d[Ndata.DBB.BBcerT%02d]>%f)",pmt,pmt,tdc_hi,pmt,pmt,tdc_low);
> >                 }else{
> >                    tdc_ct+=
> >
> Form("||(DBB.BBcerT%02d[Ndata.DBB.BBcerT%02d-%d]<%f&&DBB.BBcerT%02d[Ndata.DBB.BBcerT%02d-%d]>%f)",pmt,pmt,nhit,tdc_hi,pmt,pmt,nhit,tdc_low);
> >                 }
> >             }
> >  where pmt is the pmt that you are looking at and tdc_hi and tdc_lo are
> > the high and low ranges of the timing peak.This is shown below in the
> > plot multi_tdc.png. The blue histo is the raw TDC and the red is the
> > multi-hit cut TDC, there seems to be some background/noise in some of the
> > higher chans (>400), this can be removed by using an extra cut
> >
> >   ("DBB.BBcerT%02d<400",pmt) where pmt is the pmt you are looking at.
> >
> > Next I wanted to look at the cerenkov ADC sum, so I plot this and start
> to
> > apply multi-hit TDC cuts defined above to the sum by "OR" ing the TDC
> cuts
> > for each TDC, something like:
> >
> >  tdc_cut1 || tdc_cut2 || tdc_cut3 || ect
> >
> > However when I begin to "OR" the TDCs and apply them to the ADC sum, the
> > sum goes to zero. And yet applying the individual TDC cuts to the
> > individual ADCs, they seem ok.
> >
> > What I think may be happening is that I am using THaCherenkov class to
> > produce the ADCs (each individual ADC, ped subtracted ADC, gain corrected
> > ADC and the ADC sum) and I am using the DBB class for the TDCs. I was
> > wondering if it is possible that the two classes are some how conflicting
> > when I try to "OR" the DBB TDCs. As a curiosity I tried to use the
> > THaCherenkov TDCs(only single hit) and they leave me with a signal when
> > "OR" ing them together. You can see the cerenkov ADC sum using the
> > THCherenkov TDCs below(bb_cer_sum.png).
> >
> > I was wondering if anyone had any input on this issue?
> >
> > Thanks
> > Matt
>
>
>
> --
> Brad Sawatzky, PhD <brads at jlab.org>  -<>-  Jefferson Lab / Hall C / C111
>  Ph: 757-269-5947 -<>- Pager: 757-584-5947 -<>- Fax: 757-269-7848
> The most exciting phrase to hear in science, the one that heralds new
>  discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov
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-- 
Matthew Posik
Email: posik at temple.edu
Temple University Physics Dept.
Office: BA-319
Office #:  215-204-1331
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