<div dir="ltr">This looks channel looks ok now. I'm guessing it had dropped HV for a small amount of time then recovered. I will keep an eye on this channels stability and remove it if it keeps dropping HV. </div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Mar 2, 2019 at 9:50 PM <<a href="mailto:somov@jlab.org">somov@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div id="gmail-m_-3656217748012522736mimemail-body" class="gmail-m_-3656217748012522736elog-logentry-notify">
<div id="gmail-m_-3656217748012522736center">
<div id="gmail-m_-3656217748012522736main">
<h1 class="gmail-m_-3656217748012522736node-title">
<a href="https://logbooks.jlab.org/entry/3662239" rel="bookmark" target="_blank">Suspicious channel in the inner FCAL ring</a>
</h1>
<div class="gmail-m_-3656217748012522736contextual-links-wrapper"><ul class="gmail-m_-3656217748012522736contextual-links"><li><a href="https://logbooks.jlab.org/entry/3662239/edit?destination=email/send" target="_blank">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3662239/delete?destination=email/send" target="_blank">Delete</a></li></ul></div>
<div class="gmail-m_-3656217748012522736date-vitals">
<p class="gmail-m_-3656217748012522736author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3662239" class="gmail-m_-3656217748012522736lognumber" target="_blank">3662239</a>. Submitted by <a href="https://logbooks.jlab.org/user/somov" target="_blank">somov</a> on <a href="https://logbooks.jlab.org/entries?start_date=1551577607&end_date=1551584807&book=HDCCAL&book=HDLOG&book=HDTRIGGER" target="_blank">Sat, 03/02/2019 - 21:46</a>. </p>
<p class="gmail-m_-3656217748012522736last-update">
Last updated on Sat, 03/02/2019 - 21:50</p>
<table class="gmail-m_-3656217748012522736field-vitals"><tbody><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hdccal" target="_blank">HDCCAL</a> <a href="https://logbooks.jlab.org/book/hdlog" target="_blank">HDLOG</a> <a href="https://logbooks.jlab.org/book/hdtrigger" target="_blank">HDTRIGGER</a></td></tr><tr><th>Entry Makers: </th><td>somov</td></tr></tbody></table></div>
<div class="gmail-m_-3656217748012522736logentry gmail-m_-3656217748012522736node-content">
<p>There is one suspicious (dead) channel in the inner FCAL ring. This channel has rather large current (about 4 mA).<br>
I noticed the problem starting from run 61357 (may be it happened earlier). Colin, please check this channel on Monday,<br>
likely we'll need to replace the base.</p>
</div>
<div class="gmail-m_-3656217748012522736attachment-box">
<div class="gmail-m_-3656217748012522736image-wrapper"><img class="gmail-m_-3656217748012522736image-style-plentybig" src="https://logbooks.jlab.org/files/styles/plentybig/public/2019/03/3662239/fcal_scalers.png" width="960" height="925" alt="" title="Fig. 1 FCAL scalers"></div> <div class="gmail-m_-3656217748012522736image-wrapper"><img class="gmail-m_-3656217748012522736image-style-plentybig" src="https://logbooks.jlab.org/files/styles/plentybig/public/2019/03/3662239/ccal_monitor.png" width="960" height="557" alt="" title="Fig. 2 See CCAL Compton Positions on the occupancy plot"></div> <div class="gmail-m_-3656217748012522736image-wrapper"><img class="gmail-m_-3656217748012522736image-style-plentybig" src="https://logbooks.jlab.org/files/styles/plentybig/public/2019/03/3662239/fcal_hv.png" width="960" height="791" alt="" title="Fig. 3 FCAL HVs"></div> <div class="gmail-m_-3656217748012522736image-wrapper"><img class="gmail-m_-3656217748012522736image-style-plentybig" src="https://logbooks.jlab.org/files/styles/plentybig/public/2019/03/3662239/fcal_hv1.png" width="960" height="552" alt="" title="Fig. 4 HV"></div> </div>
</div>
</div>
</div>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div>Colin Gleason</div><div>Postdoctoral Fellow<br>Indiana University <br>Department of Physics</div></div></div>