[d2n-analysis-talk] Scintillator Timewalk

[David Flay]

On Mon, Mar 1, 2010 at 5:39 PM, Brad Sawatzky <brads at jlab.org> wrote:

> Could you replot with finer binning along the tdc axis?  Place a cut on
> single tracks, T3 triggers only (no edtm, no T4, etc), and find out what
> the units are on the TDC axis.  It would be nice to know if the two
> peaks are ~10ns apart, or 10ps apart...  If it's ps then it is either a
> bug or a binning artifact.
>

The plots I sent before already had one-track and trigger cuts.

I'm binning at 1000 bins in the TDC axis, but I don't see much of a
change... going higher (10,000 bins) I get this error message:

Error: Symbol G__exception is not defined in current scope
scint_timewalk.C:364:
Error: type G__exception not defined
FILE:/home/dflay/d2n_analysis/d2n/replay/scripts/LHRS/./scint_timewalk.C
LINE:364
*** Interpreter error recovered ***

which doesn't make sense to me...

But, in the meantime, here are the finer binned plots -- they look slightly
better, however I'm not absolutely certain. I changed to the 'colz' option
to see if I can get any idea of the number of events populating the main
band w.r.t. that fainter band at the higher TDC values -- it seems that the
higher TDC value 'band' is much less in statistics, if anything.

http://www.jlab.org/~flay/scint_timewalk/


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

office: Barton Hall, BA319
phone: (215) 204-1331

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

website: http://www.jlab.org/~flay <http://www.jlab.org/%7Eflay>
             http://quarks.temple.edu
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