[d2n-analysis-talk] PR Calib Update

[David Flay]

Hi all,

I've been working on a new calibration data set all week, and I have what
I think looks like a nice new set of calibration constants.

I calculated new calibration constants at each major momentum in the LHRS.
 This results in the first 4 plots attached.

I then plotted E/p vs. p for the electrons, which is seen in the 5th plot.
 We see a dependence on p which more closely resembles what we initially
expected -- and to me, reminds me a lot of what I see in my Geant4
simulation at first glance, but that needs some more work to confirm this
fully.

Also, the 6th plot shows the standard deviation of each electron
distribution, sigma, plotted as: sigma/p vs. p.  This plot was fit to f(x)
= a_0 + a_1/sqrt(x).  Here, a_1 gives the 'resolution' of the PR.  In this
data set, it comes out to ~14%.

I have constructed 28 new 'db_L.prlN.dat.X' files (N = 1,2; X =
{1,...,14}) to account for the new calibration constants.  The DB and
StartType.pl Perl script have been updated.  I'll send the patches along
soon.

(Brad -- would you rather me just send this to you, and you can put it on
CVS?)

In any case, the new calibration looks good.

Thanks,

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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