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</style><article id="node-475148" 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/3402319" rel="bookmark">RC Report for Saturday, April 23</a>
</h1>
</header><div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3402319" class="lognumber" data-lognumber="3402319">3402319</a>. Submitted by <a href="https://logbooks.jlab.org/user/vasulk">vasulk</a> on <time datetime="2016-04-23T11:19:15-0400" pubdate="pubdate">Sat, 04/23/2016 - 11:19</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>vasulk</td></tr></table></div>
<div class="logentry node-content">
<p>Over the past day there have been a few major interruptions of beam delivery. The first began around 10:46 in the morning<br />
due to IOC problems. Then when accelerator began to restore, the beam was suffering from BLA trips, which required a<br />
new calibration of the BLA system. Unfortunately, as this procedure was in progress, the thunder storms came through the<br />
area and caused the C100 RF in SL to trip multiple times. During Swing shift, the BLA calibration was completed and there<br />
were some issues with the 1st and 4th pass separators. Beam was finally back in Hall A around 19:40 and production was<br />
resumed on the LH2 target. Altogether beam was done for about 9 hours between 10:46 and 19:40.</p>
<p>From Swing shift to early Owl shift, beam production running went smooth until the XA/X1 raster power supply failed again.<br />
Unfortunately, we were unable to get a hold of Bill Gunning on Owl shift to come in and replace the failed power supply.<br />
Bob Michaels was contacted and suggested that we use the remaining X power supply and double the raster size. The<br />
relevant ELOG and Halog entries are below. A total of about two hours was lost on Owl shift due to the raster power supply.</p>
<p><a href="https://logbooks.jlab.org/entry/3402177">https://logbooks.jlab.org/entry/3402177</a></p>
<p><a href="https://logbooks.jlab.org/entry/3402183">https://logbooks.jlab.org/entry/3402183</a></p>
<p><a href="https://logbooks.jlab.org/entry/3402184">https://logbooks.jlab.org/entry/3402184</a></p>
<p><a href="https://logbooks.jlab.org/entry/3402204">https://logbooks.jlab.org/entry/3402204</a></p>
<p><a href="https://logbooks.jlab.org/entry/3402227">https://logbooks.jlab.org/entry/3402227</a></p>
<p>Here is the raster size from the carbon hole target after the changes: <a href="https://logbooks.jlab.org/entry/3402214">https://logbooks.jlab.org/entry/3402214</a></p>
<p>Bob Michaels came in this morning and found the spare power supplies: <a href="https://logbooks.jlab.org/entry/3402318">https://logbooks.jlab.org/entry/3402318</a></p>
<p>In the meantime, Bill Gunning called the Counting House this morning, and he is available if we want him to come<br />
into the lab. If an opportunity presents itself, such an extended accelerator down period, then we will have him<br />
replace the X1/XA power supply.</p>
<p>Since 09:15, the accelerator is having issue with a vacuum valve. An expert has been called and should be here now<br />
to fix the issue. Last estimate was that beam would be back soon.</p>
<p>Once beam is recovered, we will check the beam spot and resume production. On Swing, we plan to take 2-3 hours of<br />
15 cm dummy target data at 40 uA, and then resume production on LH2 for the rest of the weekend.</p>
<p>Issues:<br />
1) Raster X1/XA power supply failure. A plan is in place as a work around, but if an opportunity presents itself, we will<br />
take an access to replace the failed power supply.</p>
<p>2) New BCM receivers were found to be saturated above 40 uA from the BCM calibration completed on Thursday. Yesterday<br />
before before beam was restored on Swing shift, I adjusted the gain on the receivers from 39 to 19 to avoid the saturation.<br />
If we have time later today, we will ramp the current to provide a mini-BCM calibration of the new receivers against the Unser.<br />
The new receivers are not critical for GMp, since we have three analog signals U1, D1 and D3 that work up to 65 uA.</p>
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