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Maurik,<br>
<br>
Thanks for nice pictures and clearing this up, at least for me. One
thing I am still<br>
not clear about if these two cases will go through the SVT system.<br>
<br>
Stepan<br>
<div class="moz-cite-prefix">On 7/23/14 12:55 PM, Maurik Holtrop
wrote:<br>
</div>
<blockquote
cite="mid:884EBC42-2637-40D7-BC6C-E7FD2B59D131@physics.unh.edu"
type="cite">
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Hello All,
<div><br>
</div>
<div>I took a quick look with GEMC to probe the edge where the
full energy beam electrons hit the edge of the SVT vacuum
system. </div>
<div><br>
</div>
<div>To the electron side (right) we grace the edge if the
electron is at theta=7.8 degrees, phi=172.7 degrees. This causes
a hit on the edge of the second column from the right, in row 2.
So the last column is not accessible, see figure 1.</div>
<div><br>
</div>
<div>To the positron side (left) we grace the edge if the electron
is at theta= 14.3 degrees, phi=8.3 degrees. This causes hits in
the fifth column from the left, in row 2, so the left most 4
columns don't see full energy hits.</div>
<div><br>
</div>
<div>I would speculate that the hits in Luca's that were in the
yellow region get some hits directly, and also some hits that
graced the edge and so lost some energy, thus obscuring the nice
peak.</div>
<div><br>
</div>
<div>Best,</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>Maurik</div>
<div><br>
</div>
<div>Note: for the graphs below I set the GEANT4 cutoff energy at
40 MeV, so that only higher energy tracks are shown. This cleans
up the picture a lot.</div>
<div><br>
</div>
<div><br>
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</div>
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</div>
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<div><img apple-inline="yes"
id="3467FDF8-157B-4A8A-A1A9-874D75EECF07" apple-width="yes"
apple-height="yes" src="cid:part1.03090303.08030807@jlab.org"
height="1241" width="650"></div>
<div><img apple-inline="yes"
id="399C1681-8F1D-4F6B-A749-4BE93F4965D2" apple-width="yes"
apple-height="yes" src="cid:part2.01090207.07050504@jlab.org"
height="1271" width="693"></div>
<br>
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