<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Hi Dasuni,</div><div><br></div><div>do you see differences of fluxes for different neutron energies?</div><div>Specifically, below or above 1 MeV, and below or above 10 KeV ?</div><div><br></div><div>mauri</div><div><br></div><br><div><div>On Nov 5, 2010, at 9:17 AM, cristian peña wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hi,<br><br>I think this cut is only for electrons, so they might be something else that goes below the floor. I think last plot is showing only neutrons for example.<br><br>Thanks,<br>Cristian<br><br><div class="gmail_quote">
2010/11/5 Will Brooks <<a href="mailto:brooksw@jlab.org">brooksw@jlab.org</a>><br><blockquote class="gmail_quote">
<div text="#000000" bgcolor="#ffffff">
Hi, <br>
<br>
These are very nice results. <br>
<br>
To my eye, however, it looks like there are less hits originating
in the detector, and more hits originating in the beam dump. It is
as if the simulating is ignoring your instructions to stop the hits
at 10 cm before floor level. What do you think? <br>
<br>
Thanks, <br>
<br>
- Will<div><div></div><div class="h5"><br>
<br>
<br>
On 11/4/10 11:12 PM, Dasuni Kalhari Adikaram Mudiyanselage wrote:
</div></div><blockquote type="cite"><div><div></div><div class="h5"><br>
<div class="gmail_quote">Hello,<br>
<br>
I came up with some unexpected outcome with simulations in 64
bit machines. Simply, there is some additional neutron
contribution in 64-bit mode than 32-bit.<br>
<br>
Here with I’m sending you some figures that compare the new
nominal configuration in 32-bit and 64-bit modes.<br>
<br>
*Note that 10 million initial electrons were considered in each
case.<br>
*No floor particles are included. (i.e. electrons passes
y<-610cm are cutoff.)<br>
<br>
Figure 1: TOF and DC hits (Vertex plots Vy Vs. Vz)<br>
- Gives the counts of all the particles that hit the
detectors. (No energy threshold is applied) <br>
- It is clear that there is a ~50% additional background in
TOF and DC3.<br>
- And ~25% additional background in DC1.<br>
<br>
Figure 2: Energy dist. Of TOF hits<br>
- The energy distribution of TOF hit (in log scale) tells us
the, this additional particles carrying a neutron mass.
(~940MeV)<br>
<br>
Figure 3: Vertex plot for neutrons only.<br>
<br>
And also we saw a smaller
increase in neutron flux when we simulating the test run
conditions in 64 bit machines.<br>
<br>
Looking forward for your comments and ideas to solve this
Problem.<br>
<br>
Sincerely,<br>
Dasuni<br>
</div>
<br>
-- <br>
Dasuni Adikaram<br>
Graduate Research Assistant<br>
Old Dominion University<br>
Physics Department<br>
4600 Elkhorn Ave<br>
Norfolk, VA 23529<input type="hidden"><input type="hidden"><br>
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