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</style><article id="node-521702" class="node node-logentry article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3448864" rel="bookmark">TOF Shielding Study</a>
</h1>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3448864" class="lognumber" data-lognumber="3448864">3448864</a>. Submitted by <a href="https://logbooks.jlab.org/user/eugenio">eugenio</a> on <time datetime="2016-12-20T20:03:36-0500" pubdate="pubdate">Tue, 12/20/2016 - 20:03</time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hdtof">HDTOF</a></td></tr></table></div>
<div class="logentry node-content">
<p>For the last day of the run we were able to install one configuration of TOF acrylic shielding. Run after 12:00 on Oct 20 have the TOF shielding in place. Initial results are below.</p>
<p></p><div class="image-wrapper"><img class="image-style-plentybig" src="cid:4b350bd74d6e6ce553b81037e7e34706@logbooks.jlab.org" width="960" height="720" alt="" /></div>
<p>[Text from figure]<br />
Discriminator Scalers: TOF:S:T:#:scaler_t1</p>
<p>TOF South PMTs for paddles 18, 19, 20, 21(closest to beam)<br />
paddles 18 & 19 are 6cm wide<br />
paddles 20 & 21 are 3cm wide</p>
<p>Without shielding</p>
<p> Oct-19 Oct-19 Oct-19 Oct-19<br />
00:00 00:00 23:00 18:00<br />
[MHz]<br />
Beam 200nA 300nA 400nA 500nA<br />
S:21 2.3 3.3 3.7 4.7<br />
S:20 1.6 2.2 2.6 3.6<br />
S:19 1.7 2.4 2.9 3.7<br />
S:18 0.8 1.2 1.5 2.1</p>
<p>With shielding</p>
<p> ------ Oct-20 Oct-20<br />
--:-- 18:00 18:45<br />
[MHz]<br />
Beam 200nA 300nA 400nA<br />
S:21 - 2.0 2.4<br />
S:20 - 1.15 1.5<br />
S:19 - 2.0 2.5<br />
S:18 - 1.2 1.5 </p>
<p>Shielding configuration: 2.25" thick acrylic 25cm x 25cm with beam hole<br />
shielding cover paddles 21, 20, and part of 19</p>
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