<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Hmmm, that is a bit worrying.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
I think, until we understand this a bit more, we should back down the HV on just this one module by 50 V.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
I expect the reduction of efficiency to be very small because of this change. So I think we should do this soon.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Best</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Nilanga</div>
<div id="appendonsend"></div>
<div style="line-height: 1.5; font-family: "Trebuchet MS", "Helvetica Neue", Arial, Helvetica, sans-serif; font-size: 87.5%;font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr" style="line-height: 1.5; font-family: "Trebuchet MS", "Helvetica Neue", Arial, Helvetica, sans-serif; font-size: 87.5%;">
<font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Sbs_gems <sbs_gems-bounces@jlab.org> on behalf of flay@jlab.org <flay@jlab.org><br>
<b>Sent:</b> Monday, December 6, 2021 3:20 PM<br>
<b>To:</b> sbs_gems@jlab.org <sbs_gems@jlab.org><br>
<b>Subject:</b> [Sbs_gems] [New Logentry] Brief Voltage Spike on uva_xygem_2</font>
<div style="line-height: 1.5; font-family: "Trebuchet MS", "Helvetica Neue", Arial, Helvetica, sans-serif; font-size: 87.5%;">
</div>
</div>
<div id="x_mimemail-body" class="x_elog-logentry-notify" style="line-height: 1.5; font-family: "Trebuchet MS", "Helvetica Neue", Arial, Helvetica, sans-serif; font-size: 87.5%;">
<div id="x_center" style="line-height: 1.5; font-family: "Trebuchet MS", "Helvetica Neue", Arial, Helvetica, sans-serif; font-size: 87.5%;">
<div id="x_main" style="line-height: 1.5; font-family: "Trebuchet MS", "Helvetica Neue", Arial, Helvetica, sans-serif; font-size: 87.5%;">
<h1 class="x_node-title" style="font-size: 1.6em;"><a href="https://logbooks.jlab.org/entry/3957495" rel="bookmark" style="text-decoration: none;">Brief Voltage Spike on uva_xygem_2
</a></h1>
<div class="x_contextual-links-wrapper" style="line-height: 1.5; font-family: "Trebuchet MS", "Helvetica Neue", Arial, Helvetica, sans-serif; font-size: 87.5%;">
<ul class="x_contextual-links">
<li><a href="https://logbooks.jlab.org/entry/3957495/edit?destination=email/send" style="text-decoration: none;">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3957495/delete?destination=email/send" style="text-decoration: none;">Delete</a></li></ul>
</div>
<div class="x_date-vitals" style="line-height: 1.5; font-family: "Trebuchet MS", "Helvetica Neue", Arial, Helvetica, sans-serif; font-size: 87.5%;">
<p class="x_author-datetime" style="font-size: 87.5%;margin: 0.1em 0px;font-weight: bold;">
Lognumber <a href="https://logbooks.jlab.org/entry/3957495" class="x_lognumber" style="text-decoration: none;">
3957495</a>. Submitted by <a href="https://logbooks.jlab.org/user/flay" style="text-decoration: none;">
flay</a> on <time datetime="2021-12-06T15:17:32-0500"><a href="https://logbooks.jlab.org/entries?start_date=1638818252&end_date=1638825452&book=HALOG" style="text-decoration: none;">Mon, 12/06/2021 - 15:17</a></time>.
</p>
<table class="x_field-vitals" style="margin-top: 1em; margin-bottom: 1em; font-size: 87.5%;">
<tbody>
<tr>
<th style="vertical-align: middle; text-align: left; width: 15%; padding: 0.1em;">
Logbooks: </th>
<td style="vertical-align: middle; text-align: left; width: auto; padding: 0.1em;">
<a href="https://logbooks.jlab.org/book/halog" style="text-decoration: none;">HALOG</a></td>
</tr>
<tr>
<th style="vertical-align: middle; text-align: left; width: 15%; padding: 0.1em;">
Entry Makers: </th>
<td style="vertical-align: middle; text-align: left; width: auto; padding: 0.1em;">
flay</td>
</tr>
</tbody>
</table>
</div>
<div class="x_logentry x_node-content" style="line-height: 1.5; font-family: "Trebuchet MS", "Helvetica Neue", Arial, Helvetica, sans-serif; font-size: 87.5%;">
<p>Just catching up on this after the DAQ has settled back in and the HCAL HV was power cycled.
</p>
<p>At around 13:50 we had a HV spike on uva_xygem_2, see attached.</p>
</div>
<div class="x_attachment-box" style="line-height: 1.5; font-family: "Trebuchet MS", "Helvetica Neue", Arial, Helvetica, sans-serif; font-size: 87.5%;">
<div class="x_image-wrapper" style="line-height: 1.5; font-family: "Trebuchet MS", "Helvetica Neue", Arial, Helvetica, sans-serif; font-size: 87.5%;">
<img class="x_image-style-plentybig" width="960" height="316" alt="" src="https://logbooks.jlab.org/files/styles/plentybig/public/2021/12/3957495/uva_xygem_2_spike_12-06-21.png"></div>
</div>
</div>
</div>
</div>
</body>
</html>