<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
<!--
html{color:#555555;}body{line-height:1.5;font-family:'Trebuchet MS','Helvetica Neue',Arial,Helvetica,sans-serif;font-size:87.5%;}h1{font-size:1.6em;}h2.field-label{display:inline-block;font-size:1em;padding-right:5px;min-width:10em;margin:0.3em;}.problem_report{line-height:1.5;max-width:60em;}fieldset.problem_report.resolved
legend{background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAy0lEQVQ4jWP8//8/AyWAiZACd3f3/xYWFrht+f//P1a84t3e/0obff4rbfT5D1GGXR0LuoEr3+/7X3W4n2gvwA0gVSOKAcqbfPGGpImJCU45JgYGBoa7fpsZ22wLSbadgYGBgRE9GrF55Vf2BYbHjx8zYjWB0ljAcAGGExkZ/0MtwuoCggmJEBh4AzBS4pMnT/7fuXOH4dKlSwwnT56EiwcGBv43MDBgMDExYdDX12eQkZGBhAlyiC5YsOA/AwMDUXjLli3/iYoFQgAA+pSxZrXofD0AAAAASUVORK5CYII=);background-repeat:no-repeat;padding-left:18px;}fieldset.problem_report.needs_attention
legend{background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABmJLR0QA/wD/AP+gvaeTAAAA9ElEQVR42sWTvUoDQRSFv9wMKWxSBVmzdhZJIwTWv9pyLWxTpbE1kBeJPoLxBazzBgGFKNqlHXAhsITUw1y7sMpmjER0YJrDPWcO556BPzhjYPJjlhfT82LUpxcK6Lo5U0JMgcu56tXy7BQajeBDpkAcAEdz1W6uyrLdYieK2DMmKCArcqczpH/ddc0msy+OkyQJC4h3N0ynx+Q5ALtUNs5q5U+8e+R+VPFi4kjk3NZqd++qUK+TZVnYwSfAOyvejeLXt/2qVG/dYoG1dqseBNco27bs/wXKWhIDB8AhcFLAH4Bn4Al4AUqT7RVC++6mv/JVPwDi3VGzomYvyAAAAABJRU5ErkJggg==);background-repeat:no-repeat;padding-left:18px;}.problem_report div.field-items{display:inline-block;}div.date-vitals p{font-size:87.5%;}a{text-decoration:none;}.Readme a:link,.Readme a:visited,.Readme
a:active{color:red;}
-->
</style>
</head>
<body id="mimemail-body" class="elog-logentry-notify">
<div id="center">
<div id="main">
<style>
<!--/*--><![CDATA[/* ><!--*/
div.field-vitals{
margin: 0.5em 0;
}
div.field-vitals .field-type-taxonomy-term-reference {
margin: 0.1em 0;
}
article.comment {
padding-left: 10px;
}
article.comment.odd {
background-color: #EEEEEE;
}
article.comment.even {
background-color: #DDDDDD;
}
div.node-content.logentry table{
width: auto;
border-collapse: collapse;
border-spacing: 0;
border-width: 1px;
}
div.node-content.logentry th{
border: inherit;
}
div.node-content.logentry blockquote{
background-color: #FFFFFF;
}
div.node-content.logentry caption{
font-size: 1em;
font-weight: normal;
}
table.field-vitals{
margin-top: 1em;
margin-bottom: 1em;
font-size: 87.5%;
}
table.field-vitals th{
vertical-align: middle;
text-align: left;
width: 15%;
padding: 0.1em;
}
table.field-vitals td{
vertical-align: middle;
text-align: left;
width: auto;
padding: 0.1em;
}
table.field-vitals td li {
margin-left: 0;
list-style-type: none;
list-style-image: none;
}
table.downtime {
width: 30em;
margin-bottom: 1em;
border: 1px black dotted;
}
table.downtime th {
text-align: center;
}
table.downtime td {
text-align: center;
}
tr.caption th {
border-bottom: none;
}
table.downtime tfoot{
background-color:#EEEEEE;
}
div.field-name-body{
margin: 1em 0;
font-size: 110%;
}
div.date-vitals p{
margin: .1em 0;
}
article div.ctools-collapsible-container{
margin-left: -5px;
clear: both;
}
#comment-form{
margin-left: 5px;
border: graytext outset medium;
-moz-border-radius: 15px;
border-radius: 15px;
padding: 1em;
}
div.comments-form-box {
margin-top: 2em;
margin-bottom: 5em;
}
h3.comment-title {
/* display: none; */
}
p.author-datetime{
font-weight: bold;
}
/*--><!]]>*/
</style><article id="node-909335" 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/3836354" rel="bookmark">RC Daily Update</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3836354/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3836354/delete?destination=email/send">Delete</a></li></ul></div>
<div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3836354" class="lognumber" data-lognumber="3836354">3836354</a>. Submitted by <a href="https://logbooks.jlab.org/user/bduran">bduran</a> on <time datetime="2020-08-28T13:33:26-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1598632406&end_date=1598639606&book=HCLOG">Fri, 08/28/2020 - 13:33</a></time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hclog">HCLOG</a></td></tr><tr><th>Entry Makers: </th><td>bduran</td></tr></table></div>
<div class="logentry node-content">
<p>Yesterday we had an eventful ~ 2 hour access (11am - 12:40pm) and we completed the following tasks:</p>
<p> 1) HV supply for the transport and compton ion chamber is separated to troubleshoot the ion chamber issue (<a href="https://logbooks.jlab.org/entry/3835254">https://logbooks.jlab.org/entry/3835254</a>), Jerry Kowal and his team was in charge of this (<a href="https://logbooks.jlab.org/entry/3835705">https://logbooks.jlab.org/entry/3835705</a>).<br />
2) Joe Beaufait resetted the rotation drive controllers.<br />
3) Stan, Jerry and Larry connected the spare air compressor that Walter rented. (<a href="https://logbooks.jlab.org/entry/3833255">https://logbooks.jlab.org/entry/3833255</a>, <a href="https://logbooks.jlab.org/entry/3835706">https://logbooks.jlab.org/entry/3835706</a>)<br />
4) Junhao changed the EPR RF amplifier gain setting from 70% to 40% to fix the noisy NMR (<a href="https://logbooks.jlab.org/entry/3835639">https://logbooks.jlab.org/entry/3835639</a>) (<a href="https://logbooks.jlab.org/entry/3835639">https://logbooks.jlab.org/entry/3835639</a>)<br />
5) Brad checked if the blowers are on to troubleshoot (<a href="https://logbooks.jlab.org/entry/3835710">https://logbooks.jlab.org/entry/3835710</a> <a href="https://logbooks.jlab.org/entry/3835710">https://logbooks.jlab.org/entry/3835710</a>, <a href="https://logbooks.jlab.org/entry/3835740">https://logbooks.jlab.org/entry/3835740</a>, <a href="https://logbooks.jlab.org/entry/3835740">https://logbooks.jlab.org/entry/3835740</a>) </p>
<p>At 12:40 pm, we were back in beam permit. After checking the beam positions and possible scraping on reference cell (He3) (<a href="https://logbooks.jlab.org/entry/3835696">https://logbooks.jlab.org/entry/3835696</a>, <a href="https://logbooks.jlab.org/entry/3835702">https://logbooks.jlab.org/entry/3835702</a>) we resumed data taking with this target. An NMR @2:08pm gave 35.8% <a href="https://logbooks.jlab.org/entry/3835727">https://logbooks.jlab.org/entry/3835727</a> and pNMR: 35.27% <a href="https://logbooks.jlab.org/entry/3835735">https://logbooks.jlab.org/entry/3835735</a>. After consulting with JP and Brad, we decided to start data taking with PolHe3 with transverse spin. After verifying the beam positions and no scraping (<a href="https://logbooks.jlab.org/entry/3835752">https://logbooks.jlab.org/entry/3835752</a>, <a href="https://logbooks.jlab.org/entry/3835792">https://logbooks.jlab.org/entry/3835792</a>), we took data with PolHe3 transverse until the accelerator went down at 9:35pm due to weather-caused RF trips. At 7:38pm another NMR/pNMR measurement was performed, 35.52/35.8% respectively (<a href="https://logbooks.jlab.org/entry/3835936">https://logbooks.jlab.org/entry/3835936</a>, <a href="https://logbooks.jlab.org/entry/3835936">https://logbooks.jlab.org/entry/3835936</a>). At 8:44pm, Bill started transverse QWP optimization (<a href="https://logbooks.jlab.org/entry/3835943">https://logbooks.jlab.org/entry/3835943</a>). The beam quality during the data taking wasn't great due to mostly BLM trips at injector/HallD line and occasional Hall A/C ion chamber trips. During the down time, as a follow up to the transport ion chamber work done in the hall yesterday, Hall C ion chamber HV was power cycled (<a href="https://logbooks.jlab.org/entry/3835989">https://logbooks.jlab.org/entry/3835989</a>). We will see if this will help with the ion chamber trip problem.</p>
<p>MCC was ready to send beam at 1:07am. After a long downtime, we asked for harp scans to check the beam profile ( <a href="https://logbooks.jlab.org/entry/3836043">https://logbooks.jlab.org/entry/3836043</a>, <a href="https://logbooks.jlab.org/entry/3836053">https://logbooks.jlab.org/entry/3836053</a>) and following that, checked the beam positions for PolHe3 at no target (<a href="https://logbooks.jlab.org/entry/3836067">https://logbooks.jlab.org/entry/3836067</a>). Before we started running with PolHe3 another NMR/pNMR measurement was done @1:45am: 37.4%/37.2% (<a href="https://logbooks.jlab.org/entry/3836071">https://logbooks.jlab.org/entry/3836071</a> <a href="https://logbooks.jlab.org/entry/3836066">https://logbooks.jlab.org/entry/3836066</a>). When scraping check was done at 1:47am, we resumed data taking with PolHe3 transverse. We took data until 05:10am when SL RF went down because of iocch2a being unresolved (<a href="https://logbooks.jlab.org/entry/3836159">https://logbooks.jlab.org/entry/3836159</a>), this was followed by SL 2K cold box trip as it's unable to handle heat load changes with only half the SL up. </p>
<p>The accelerator has been down since 05:10am. At today's MCC morning meeting, the expected down time was expected as at least 5-6 hours. We had an update at 10:57am: they were able to reboot and restore IOCCH2A and regain control over the SW linac signals. There is an LHe overflow from SL return and they're setting up the system for the overflow recovery which will likely won't happen before tomorrow morning (<a href="https://logbooks.jlab.org/entry/3836302">https://logbooks.jlab.org/entry/3836302</a>). Fairly soon we had another update 11:07am indicated the situation doesn't look as bad as they initially thought. However, based on my conversation with crew chief this still means a couple of hours down time even if the pumpdown attemp is successful (<a href="https://logbooks.jlab.org/entry/3836308">https://logbooks.jlab.org/entry/3836308</a>). At 12:18pm, the pumpdown attempts have started <a href="https://logbooks.jlab.org/entry/3836334">https://logbooks.jlab.org/entry/3836334</a>.</p>
<p>Melanie's AFP loss test on Briana at 270 deg @10:13am : <a href="https://logbooks.jlab.org/entry/3836289">https://logbooks.jlab.org/entry/3836289</a></p>
<p>At 10:51am today, Junhao took an escorted access to test the impact of the EPR RF amplifier on NMR signal (<a href="https://logbooks.jlab.org/entry/3836301">https://logbooks.jlab.org/entry/3836301</a>, <a href="https://logbooks.jlab.org/entry/3836329">https://logbooks.jlab.org/entry/3836329</a>). Since the expected downtime is a couple of more hours and we'd like to take advantage of it for Simona's SoLID Cherenkov work and Junhao's possible EPR RF test we asked for a full survey which was finished at 12:18pm. Simona is in the hall for her SoLID Cherenkov work.</p>
<p>Target temperature test @1:31pm : <a href="https://logbooks.jlab.org/entry/3836349">https://logbooks.jlab.org/entry/3836349</a></p>
<p>We will have an RC Meeting at 4:15 pm</p>
<p>Bluejeans remote connection information:<br />
To join the Meeting:<br /><a href="https://bluejeans.com/861439920">https://bluejeans.com/861439920</a><br />
To join via Room System:<br />
Video Conferencing System: bjn.vc -or-199.48.152.152<br />
Meeting ID : 861439920<br />
To join via phone :<br />
1) Dial: +1.408.740.7256 (US (San Jose))<br />
+1.888.240.2560 (US Toll Free))<br />
+1.408.317.9253 (US (Primary, San Jose))<br />
(see all numbers - <a href="http://bluejeans.com/numbers">http://bluejeans.com/numbers</a>)<br />
2) Enter Conference ID : 861439920</p>
</div>
<div class="attachment-box">
</div>
</article> </div>
</div>
</body>
</html>