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</style><article id="node-1031612" class="node node-logentry contextual-links-region article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3958588" rel="bookmark">UVA XY GEM -1, 12 slot back plane MPD (fiber 1/ MPD port 3) was replaced</a>
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</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3958588/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3958588/delete?destination=email/send">Delete</a></li></ul></div>
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Lognumber <a href="https://logbooks.jlab.org/entry/3958588" class="lognumber" data-lognumber="3958588">3958588</a>. Submitted by <a href="https://logbooks.jlab.org/user/adr">adr</a> on <time datetime="2021-12-07T23:34:30-0500" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1638934470&end_date=1638941670&book=HALOG&book=SUPERBIGBITE">Tue, 12/07/2021 - 23:34</a></time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/halog">HALOG</a> <a href="https://logbooks.jlab.org/book/superbigbite">SUPERBIGBITE</a></td></tr><tr><th>Tags: </th><td><a href="https://logbooks.jlab.org/tag/gem">GEM</a></td></tr><tr><th>Entry Makers: </th><td>adr, gautam, ewertz, xbai</td></tr></table></div>
<div class="logentry node-content">
<p>We replaced the MPD as it was decided this could be the most likely the cause for the low efficiency in XY GEM -1 we have been seeing for the last several hours (See the following 50K replay for reference. Look at module 7 <a href="https://logbooks.jlab.org/entry/3958530">https://logbooks.jlab.org/entry/3958530</a>).<br />
This MPD reads out the 12 slot back plane of the UVA XY GEM 1.</p>
<p>We made sure MPD lib test is coming out all well for the new MPD plus all the other MPDs as well. We also made sure DAQ is running fine and all the raw APV frames looks good (except fiber 14 - APV 11 which is coming out with a high baseline value close to 1400 ADC but at this point we can't hold the experiment from proceeding just because of a single APV. So we will have to investigate this further later on).</p>
<p>A new pedestal file has been uploaded to the DAQ (with run no: 12649).</p>
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