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<u><b>Hovhannes & Jon:</b></u> Started looking at efficiency maps,
which is a 2d plot of physics angles theta(scattering) vs.
phi(azimuthal). This will involve looking at regions of phi for
efficiency dependence and normalizing to the bin(s) of maximum
efficiency. Jon will do this for the parallel runs.<br>
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<u><b>Whitney:</b></u> Will prepare a table for Cerenkov information.
This will list date, run#, HV, iron plate(s) in/out, ...<br>
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<u><b>James:</b></u> Will start doing a consistency of the energy cut
(E > 1.2 or 1.3GeV) check for the parallel runs.<br>
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<u><b>Anusha:</b></u> Looking at elastic e-p coincidence data from CH2
(no magnetic field) 5.9GeV runs. Made plots of x, y, and P diff (=
measured - predicted) as function of slow raster x & y. Sees
correlations for x & y. Tried switching the sign on the slope of
the SR. This improved the y-diff, but not the x-diff. Hovhannes pointed
out that the SR is not calibrated for this period and that could affect
the reconstruction. Will look into this.<br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Ep_Elastics">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Ep_Elastics</a> <br>
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<u><b>Hoyoung:</b></u> Did the packing fractions for the parallel runs.
Correcting with the carbon data made the 4.7GeV parallel data give
reasonable packing fraction values, averaging about 60%. The 5.9GeV
parallel data gives varying packing fractions. This can be accounted
for with the fact that the HMS DC was having gas problems, which
affected the efficiencies<br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/hclog/0903_archive/090308152706.html">https://hallcweb.jlab.org/hclog/0903_archive/090308152706.html</a><br>
<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Hykang">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Hykang</a><br>
Mark mentioned that Anusha has a way for correcting this and Hoyoung
will talk with her about using it. <br>
Should have the dilution factors within about a week.<br>
For those who don't know, Hoyoung will be going to basic training soon
for his civil service and will return around May. Seonho will keep us
informed/updated.<br>
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