[d2n-analysis-talk] Trigger Offset for S1, S2m Paddles?

[David Flay]

On Fri, Aug 27, 2010 at 10:52 AM, David Flay <flay at jlab.org> wrote:

> Hey Brad,
>
> I was poking around the source code, and I've found an interesting
> quantity in the THaScintillator class: a data member called fTrigOff,
> which eventually finds its way into the ROOTfile as L.s2.troff (for S2m,
> for instance).  It's labeled as a 'trigger offset for paddles.'  Looking
> at the source code, it shows up in the ReadDatabase method (after it's
> been initialized to 0):
>
>  while ( ReadComment( fi, buf, LEN ) ) {}
>  // trigger timing offsets
>  {
>    int cnt=0;
>    while ( cnt<fNelem && fgets( buf, LEN, fi ) && ! strchr(buf,'[') ) {
>      char *ptr = buf;
>      int pos=0;
>      while ( cnt < fNelem && sscanf(ptr,"%lf%n",&fTrigOff[cnt],&pos)>0 ) {
>        ptr += pos;
>        cnt++;
>      }
>    }
>  }
>

to elaborate on this -- from THaScintillator.h:

   Double_t*   fTrigOff;     // [fNelem] Induced offset of trigger time from
                                     // diff between trigger and retiming.
                                     // Visible in coincidence data.




-- 
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David Flay
Physics Department
Temple University
Philadelphia, PA 19122

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e-mail: flay at jlab.org
            flay at temple.edu

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