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Hi, <br>
<br>
It looks like a great study.<br>
<br>
Another item worth considering to explore is the length of the
collimator (unless you already did this). We are mainly interested in
reducing the larger-angle tracks. If you're using a short collimator,
it might be more effective to make a longer one (or two shorter ones).<br>
<br>
The conclusion on point 3 is difficult because of the statistical
fluctuations. It may be higher priority to make two collimators of
different diameters.<br>
<br>
Thanks, <br>
<br>
- Will<br>
<br>
<br>
On 6/7/10 2:41 PM, Larry Weinstein wrote:
<blockquote cite="mid:4C0D3D6E.90005@odu.edu" type="cite">Dear TPE
Folks,
<br>
<br>
I need comments ASAP so Dave can order the materials. There is a long
lead time for these.
<br>
<br>
Here are the results of Dasuni's simulations for a) lead vs tungsten
for a 2 cm radphi-wall collimator, b) lead vs tungsten for the moller
catcher and c) different diameters for the radphi wall collimator.
<br>
<br>
Two points about the table:
<br>
1) each line represents the results of 10 million incident electrons.
You need to average the occupancies for each run type and sum the
lepton flux (last column). This was done to gove us a better idea of
the statistical uncertainties in the results.
<br>
2) When comparing the radphi wall collimator diameters, you need to
normalize to the lepton flux (last column).
<br>
<br>
My conclusions:
<br>
1) 2 cm is best for the radphi wall collimator. 1.8 cm is almost as
good.
<br>
2) tungsten is much better than lead for the radphi wall collimator
<br>
3) I am not sure whether we need tungsten for the Moller catcher
<br>
<br>
Please comment ASAP.
<br>
<br>
- Larry
<br>
<br>
<br>
<br>
<br>
<br>
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