[d2n-analysis-talk] z_react Check Via Focal Plane Cuts [Positive Polarity]

[David Flay]

Hey Brad,

Attached are the same plots I sent along last time concerning the focal
plane cuts and their subsequent effect on z_react.  This time, for
positive polarity run 20620 (p = 1.27 GeV, E = 5.89 GeV, rastered beam 2 x
2.6)

Looking at this plot, the positions of the foils (plot 1) line up with the
nominal positions, just like negative polarity.

The focal plane cuts reveal a behavior similar to that of the negative
polarity plot I showed a few days ago.

Concerning a check of rastered beam [optics] runs compared to unrastered
beam runs, the unrastered runs are few and far between and have very low
statistics, such that even chaining them together doesn't allow me to make
a good estimation of the carbon foil widths (using a Gaussian fit).

Speaking of widths, you'll also see that the positive polarity widths are
slightly smaller (~3mm) compared to that of the negative polarity widths
(~5mm) [for the three main peaks -- both values I obtained from a quick
Gaussian fit, seen in the plots -- compare the first two plots].  I think
this may be due to the reduced statistics I have here, as I've chained
together only two runs in the positive polarity configuration, which
combine for ~80k events, compared to the one negative polarity run of
~190k events.

Dave

-------------------------------------------------
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://quarks.temple.edu
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