<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">FYI, we’ll have an access starting at 8:30 Monday morning, if there is work to be done for this channel or otherwise.<div class="">-Justin<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Mar 3, 2019, at 11:12 AM, Colin Gleason <<a href="mailto:gleasonc@jlab.org" class="">gleasonc@jlab.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div dir="ltr" class="">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 class=""><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" class="">somov@jlab.org</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<a href="https://logbooks.jlab.org/entry/3662239" rel="bookmark" target="_blank" class="">Suspicious channel in the inner FCAL ring</a>
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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" class="">somov</a> on <a href="https://logbooks.jlab.org/entries?start_date=1551577607&end_date=1551584807&book=HDCCAL&book=HDLOG&book=HDTRIGGER" target="_blank" class="">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 class=""><tr class=""><th class="">Logbooks: </th><td class=""><a href="https://logbooks.jlab.org/book/hdccal" target="_blank" class="">HDCCAL</a> <a href="https://logbooks.jlab.org/book/hdlog" target="_blank" class="">HDLOG</a> <a href="https://logbooks.jlab.org/book/hdtrigger" target="_blank" class="">HDTRIGGER</a></td></tr><tr class=""><th class="">Entry Makers: </th><td class="">somov</td></tr></tbody></table></div>
<div class="gmail-m_-3656217748012522736logentry gmail-m_-3656217748012522736node-content"><p class="">There is one suspicious (dead) channel in the inner FCAL ring. This channel has rather large current (about 4 mA).<br class="">
I noticed the problem starting from run 61357 (may be it happened earlier). Colin, please check this channel on Monday,<br class="">
likely we'll need to replace the base.</p>
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<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>
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</blockquote></div><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div dir="ltr" class="gmail_signature"><div dir="ltr" class=""><div class="">Colin Gleason</div><div class="">Postdoctoral Fellow<br class="">Indiana University <br class="">Department of Physics</div></div></div>
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