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The temperature in the hall is not uniform. Heat rises. Temps on the
top levels of the space frame and forward carriage are higher than
those at lower levels. During CLAS6, large recirculation fans were
used to minimize this temperature gradient. These fans are no longer
used in the hall.<br>
<br>
We should monitor the temperature of the air tank on top of the Fwd
Carriage. We can then determine how the temperature of the
electronics varies with the temperature of the cooling air .<br>
<br>
George<br>
<br>
<br>
<div class="moz-cite-prefix">On 8/7/2018 4:56 PM, Amrit Yegneswaran
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1997648082.16099899.1533675411572.JavaMail.zimbra@jlab.org">
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<div style="font-family: tahoma,new york,times,serif; font-size:
14pt; color: #009900">
<div>valery,<br>
</div>
<div>as marc's email yesterday suggested, keeping the roll up
door open increases the temp in the hall.<br
data-mce-bogus="1">
</div>
<div>tyler looked into the matter today and noticed that the
hall temp goes up by 5 F.<br data-mce-bogus="1">
</div>
<div>(tyler will send a detailed report after the dsg meeting
tomorrow)<br data-mce-bogus="1">
</div>
<div>so for now the options are:<br data-mce-bogus="1">
</div>
<ol style="list-style-type: undefined;">
<li>ask that the roll up door be kept shut, as much as
possible . <br data-mce-bogus="1">
</li>
<li>increase air flow by about 5%<br data-mce-bogus="1">
</li>
<li>increase threshold by another 3 C.<br data-mce-bogus="1">
</li>
</ol>
<div>in reality we have <span id="transmark" style="display:
none; width: 0px; height: 0px;"></span>3C3+3C2+3C1 +3C0
options!<br data-mce-bogus="1">
</div>
<div>amrit<br data-mce-bogus="1">
</div>
<div><br>
</div>
<hr id="zwchr" data-marker="__DIVIDER__">
<div data-marker="__HEADERS__"><b>From: </b><a class="moz-txt-link-abbreviated" href="mailto:vpk@jlab.org">vpk@jlab.org</a><br>
<b>To: </b><a class="moz-txt-link-abbreviated" href="mailto:dsg-rich@jlab.org">dsg-rich@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:vpk@jlab.org">vpk@jlab.org</a><br>
<b>Sent: </b>Tuesday, August 7, 2018 4:00:04 PM<br>
<b>Subject: </b>[Dsg-rich] [New Logentry] RICH high
temperature interlock came off again.<br>
</div>
<div><br>
</div>
<div data-marker="__QUOTED_TEXT__">
<div id="center">
<div id="main">
<h1 class="node-title"><a
href="https://logbooks.jlab.org/entry/3584622"
rel="bookmark" target="_blank"
data-mce-href="https://logbooks.jlab.org/entry/3584622"
marked="1" moz-do-not-send="true">RICH high
temperature interlock came off again.</a><br
data-mce-bogus="1">
</h1>
<div class="date-vitals">
<p class="author-datetime">Lognumber <a
href="https://logbooks.jlab.org/entry/3584622"
class="lognumber" target="_blank"
data-mce-href="https://logbooks.jlab.org/entry/3584622"
marked="1" moz-do-not-send="true">3584622</a>.
Submitted by <a
href="https://logbooks.jlab.org/user/vpk"
target="_blank"
data-mce-href="https://logbooks.jlab.org/user/vpk"
marked="1" moz-do-not-send="true">vpk</a> on Tue,
08/07/2018 - 15:58.</p>
<table class="field-vitals">
<tbody>
<tr>
<th>Logbooks:</th>
<td><a href="https://logbooks.jlab.org/book/rich"
target="_blank"
data-mce-href="https://logbooks.jlab.org/book/rich"
marked="1" moz-do-not-send="true">RICH</a><br
data-mce-bogus="1">
</td>
</tr>
<tr>
<th>Entry Makers:</th>
<td>vpk</td>
</tr>
</tbody>
</table>
</div>
<div class="logentry node-content">
<p>We have the same situation today around noon: high
temp interlock (N5 and 6) switched RICH off lv and hv.<br>
I increased (+2C) the high limits at these sensors. It
is still acceptable for the front-end electronics.</p>
</div>
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<pre wrap="">_______________________________________________
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<pre class="moz-signature" cols="72">--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7021
(cell) 757-876-0480
(email) <a class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
(website) <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a></pre>
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