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<p class="MsoNormal">Hi all, <o:p></o:p></p>
<p class="MsoNormal">I think we should be clear on what we are discussing here! <o:p>
</o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo3">What I saw on the logbook looks like a spark from me and I don’t really think it is something to worry about. We expect that with GEMs unless there is a specific pattern with that
spike and in that case we should take ab look and try to understand. I would suggest that GEM expert look at the chart and come with a clear conclusion on that
<o:p></o:p></li></ul>
<p class="MsoListParagraph"><o:p> </o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo3">Reducing HV for 50 V because of APV saturation is a discussion that we had yesterday , so I will not repeat the argument here but let’s try not to mix issues and solution we apply
to try to address. <o:p></o:p></li></ul>
<p class="MsoListParagraph"><o:p> </o:p></p>
<p class="MsoNormal">Best regards <o:p></o:p></p>
<p class="MsoNormal">Kondo<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Sbs_gems <sbs_gems-bounces@jlab.org> <b>On Behalf Of
</b>David Flay<br>
<b>Sent:</b> Monday, December 6, 2021 3:46 PM<br>
<b>To:</b> Liyanage, Nilanga K (nl8n) <nl8n@virginia.edu>; sbs_gems@jlab.org<br>
<b>Subject:</b> Re: [Sbs_gems] [New Logentry] Brief Voltage Spike on uva_xygem_2<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Thanks Nilanga,<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Zeke and I will do that before we start the next run. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Best regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">David <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">----------------------------------------------------------------</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">David Flay, Ph. D.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Hall A/C Staff Scientist<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Thomas Jefferson National Accelerator Facility<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Office: CEBAF Center, C119<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">----------------------------------------------------------------<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> Liyanage, Nilanga K (nl8n) <<a href="mailto:nl8n@virginia.edu">nl8n@virginia.edu</a>><br>
<b>Sent:</b> Monday, December 6, 2021 3:37 PM<br>
<b>To:</b> David Flay <<a href="mailto:flay@jlab.org">flay@jlab.org</a>>; <a href="mailto:sbs_gems@jlab.org">
sbs_gems@jlab.org</a> <<a href="mailto:sbs_gems@jlab.org">sbs_gems@jlab.org</a>><br>
<b>Subject:</b> [EXTERNAL] Re: [Sbs_gems] [New Logentry] Brief Voltage Spike on uva_xygem_2</span>
<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Hmmm, that is a bit worrying.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">I think, until we understand this a bit more, we should back down the HV on just this one module by 50 V.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">I expect the reduction of efficiency to be very small because of this change. So I think we should do this soon.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Best<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Nilanga<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> Sbs_gems <<a href="mailto:sbs_gems-bounces@jlab.org">sbs_gems-bounces@jlab.org</a>> on behalf of
<a href="mailto:flay@jlab.org">flay@jlab.org</a> <<a href="mailto:flay@jlab.org">flay@jlab.org</a>><br>
<b>Sent:</b> Monday, December 6, 2021 3:20 PM<br>
<b>To:</b> <a href="mailto:sbs_gems@jlab.org">sbs_gems@jlab.org</a> <<a href="mailto:sbs_gems@jlab.org">sbs_gems@jlab.org</a>><br>
<b>Subject:</b> [Sbs_gems] [New Logentry] Brief Voltage Spike on uva_xygem_2</span><span style="font-size:9.5pt;font-family:"Trebuchet MS",sans-serif">
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.5pt;font-family:"Trebuchet MS",sans-serif"> <o:p></o:p></span></p>
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<h1><span style="font-size:12.0pt;font-family:"Trebuchet MS",sans-serif"><a href="https://logbooks.jlab.org/entry/3957495"><span style="text-decoration:none">Brief Voltage Spike on uva_xygem_2
</span></a><o:p></o:p></span></h1>
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<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-size:6.5pt;font-family:"Trebuchet MS",sans-serif"><a href="https://logbooks.jlab.org/entry/3957495/edit?destination=email/send"><span style="text-decoration:none">Edit</span></a><o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-size:6.5pt;font-family:"Trebuchet MS",sans-serif"><a href="https://logbooks.jlab.org/entry/3957495/delete?destination=email/send"><span style="text-decoration:none">Delete</span></a><o:p></o:p></span></li></ul>
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<p class="xxauthor-datetime" style="mso-margin-top-alt:1.2pt;margin-right:0in;margin-bottom:1.2pt;margin-left:0in">
<b><span style="font-size:5.5pt;font-family:"Trebuchet MS",sans-serif">Lognumber <a href="https://logbooks.jlab.org/entry/3957495">
<span style="text-decoration:none">3957495</span></a>. Submitted by <a href="https://logbooks.jlab.org/user/flay">
<span style="text-decoration:none">flay</span></a> on <a href="https://logbooks.jlab.org/entries?start_date=1638818252&end_date=1638825452&book=HALOG">
<span style="text-decoration:none">Mon, 12/06/2021 - 15:17</span></a>. <o:p></o:p></span></b></p>
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<b><span style="font-size:9.5pt">Logbooks: <o:p></o:p></span></b></p>
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<span style="font-size:9.5pt"><a href="https://logbooks.jlab.org/book/halog"><span style="text-decoration:none">HALOG</span></a><o:p></o:p></span></p>
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<b><span style="font-size:9.5pt">Entry Makers: <o:p></o:p></span></b></p>
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<span style="font-size:9.5pt">flay<o:p></o:p></span></p>
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<p><span style="font-size:6.5pt;font-family:"Trebuchet MS",sans-serif;color:white">Just catching up on this after the DAQ has settled back in and the HCAL HV was power cycled.
</span><span style="font-size:6.5pt;font-family:"Trebuchet MS",sans-serif"><o:p></o:p></span></p>
<p><span style="font-size:6.5pt;font-family:"Trebuchet MS",sans-serif">At around 13:50 we had a HV spike on uva_xygem_2, see attached.<o:p></o:p></span></p>
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