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</style><article id="node-866194" 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/3793225" rel="bookmark">RC update</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3793225/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3793225/delete?destination=email/send">Delete</a></li></ul></div>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3793225" class="lognumber" data-lognumber="3793225">3793225</a>. Submitted by <a href="https://logbooks.jlab.org/user/chandan">chandan</a> on <time datetime="2020-02-27T12:35:56-0500" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1582821356&end_date=1582828556&book=HALOG">Thu, 02/27/2020 - 12:35</a></time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/halog">HALOG</a></td></tr><tr><th>Entry Makers: </th><td>chandan</td></tr></table></div>
<div class="logentry node-content">
<p>Dear Collaborators,</p>
<p>We got beam back at 16:00 yesterday. Restored high current beam in the hall with 1% Carbon target around 17:00.<br />
Beam spot on target was 136(x)by 150(y)micrometer.<br />
Then handed over to compton people for centering beam with LASER and collimator. This went upto 7 pm.<br />
Then HallD started having BLM trips when HallA was up (<a href="https://logbooks.jlab.org/entry/3792731">https://logbooks.jlab.org/entry/3792731</a>).<br />
Around that time we were in situation to run overnight with lower current.<br />
But MCC worked with optics-on-call and solved that problem (<a href="https://logbooks.jlab.org/entry/3792853">https://logbooks.jlab.org/entry/3792853</a>).<br />
We started production around 9:10pm with FFB on, RF on, FF DAC off and BMod on.<br />
The main detector yield (>0.03 V/mciroAmp), width (regressed <800 ppm), slope (~40 ppm/micrometer) are looks good.<br />
High current raster check looks good (uniform 2D distribution of beam at target). We have about two hours of production data before 1L07-FCC lost communication.<br />
(<a href="https://logbooks.jlab.org/entry/3792834">https://logbooks.jlab.org/entry/3792834</a>).</p>
<p>In the night we have requested escorted access to reverse a change made to the Compton laser power earlier today to increase detector resolution.<br />
We got back beam at 6 am in the morning and requested for harp scan. But ioc control with the harp wire is lost. Took hall access and reboot the ioc.<br />
MCC was not able to communicate with that ioc (software issue). Fixed that around 8 am.<br />
Harp scan on 1HA1H04A and 1HA1H04B wires are performed.<br />
Established high current with 1%C target. At 8:45 am started production with Ca-48 target.</p>
<p>Last night we have decreased current ramp rate to 10 microAmp/s (per MCC's request) to avoid trips. In the morning we have requested to increase to 20 microAmp/s and they did it.<br />
The plan is to continue production.</p>
<p>We will have our usual meeting upstairs in the counting house at 3:15 PM today. Bluejeans link for remote participants: <a href="https://bluejeans.com/256205934">https://bluejeans.com/256205934</a></p>
<p>Chandan Ghosh<br />
(Hall A Run Coordinator)</p>
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