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</style><article id="node-399341" 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/3326557" rel="bookmark">Present experiment status</a>
</h1>
</header><div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3326557" class="lognumber" data-lognumber="3326557">3326557</a>. Submitted by <a href="https://logbooks.jlab.org/user/jones">jones</a> on <time datetime="2015-03-15T07:57:54-0400" pubdate="pubdate">Sun, 03/15/2015 - 07:57</time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/elog">ELOG</a></td></tr></table></div>
<div class="logentry node-content">
<p>Yesterday was spent with a test plan to understand the 6 quads in the Moller beam line region. The OTR<br />
viewer was essential to accomplish this. See entry <a href="https://logbooks.jlab.org/entry/3326311">https://logbooks.jlab.org/entry/3326311</a> with pictures from the<br />
test plan. The end result was that MCC found that the last quad , MQA1H04, had the wrong polarity . See<br />
entries <a href="https://logbooks.jlab.org/entry/3326313">https://logbooks.jlab.org/entry/3326313</a> and <a href="https://logbooks.jlab.org/entry/3326314">https://logbooks.jlab.org/entry/3326314</a>.</p>
<p>During an hall entry to look into a problem with cycling a Moller quad, MQO1H03A, ( this ended up to<br />
be a problem with the wrong value in the database for cycling the magnet which was trying to make the<br />
power supply go above its limit) , a water leak was found in the HRSR Q1. The water flow was closed to<br />
Q1 and the power turned off. Probably Monday there will be an opportunity to fix this problem. I will<br />
update people when I learn more.</p>
<p>The swing shift was spent centering the carbon hole target. The end result was that the target ladder needed to<br />
be shifted by 6.5mm vertical and the beam put at 2.5mm in the horizontal. next the "raster target" or long cylinder<br />
was put in the been and various raster sizes were tried and the T3 scaler rate was monitored. At raster sizes of<br />
"1x1" and "2x2" the T3 rate was a little more than cosmic rate.<br />
It was found that at raster of "3x3" the T3 rate jumped to 4 Khz. See entry for summary<br /><a href="https://logbooks.jlab.org/entry/3326454">https://logbooks.jlab.org/entry/3326454</a> . Efforts were made to vary the incoming beam angle but no setting was better than<br />
others , though setting the 4AY and 4DY positions both to zero gave a 3 fold increase in the rate. So it was<br />
decided to have the 4AY = - .5 and 4DY = +.5 and use the "2x2" raster.</p>
<p> For owl shift the "optics" target was put in place and the optics looked good. The LH2 target<br />
was put in place and the target reconstruction looked good with no long tails.</p>
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