<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Dear targeteers,<div class=""><br class=""></div><div class="">I forgot to bring up this calculation done by Jixie at yesterday’s meeting. Probably nothing surprising, but it’s nice we have these numbers. - Sebastian<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">Begin forwarded message:</div><br class="Apple-interchange-newline"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">From: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">Jixie Zhang <<a href="mailto:jixie@jlab.org" class="">jixie@jlab.org</a>><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Subject: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><b class="">FLUKA simulation result for Hall-B polarized target</b><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Date: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">July 5, 2017 at 4:37:08 PM EDT<br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">To: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">James Maxwell <<a href="mailto:jmaxwell@jlab.org" class="">jmaxwell@jlab.org</a>>, "Kuhn, Sebastian E." <<a href="mailto:skuhn@odu.edu" class="">skuhn@odu.edu</a>>, Dustin Keller <<a href="mailto:dustin@jlab.org" class="">dustin@jlab.org</a>>, "Day, Donal B. (dbd)" <<a href="mailto:dbd@eservices.virginia.edu" class="">dbd@eservices.virginia.edu</a>><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Resent-From: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><<a href="mailto:skuhn@odu.edu" class="">skuhn@odu.edu</a>><br class=""></span></div><br class=""><div class="">
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<div class="">Dear all, <br class="">
Attached is the FLUKA simulation result for the Hall-B<br class="">
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double cell polarized target. To save your time, I paste the conclusion<br class="">
<div class=""> here. For details, please read the attachment.<br clear="all" class="">
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<div class=""><br class="">
Summary:<br class="">
1) FLUKA simulation has been performed Hall-B double-cell polarized target assuming 11 GeV beam with 10nA beam current for 90 days. I did not use 5T target field since it will not affect the radiation result in this project.<br class="">
2) The accumulated 1MeV neutron equivalent damage to silicon for area with Z<20cm and R>5cm is below 10^13. It will be safe to place detectors or electronics in this area.
<br class="">
3) Heat load in target is about 5.5 mili-watt per cm^2, or about 31.2 mili-watt for each target cell.<br class="">
4) Dose rate from activation is negligible everywhere.<br class="">
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-- <br class="">
<div class="gmail_signature">With Best Regards,<br class="">
Jixie Zhang<br class="">
757-269-7735 <br class="">
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