<div dir="ltr">Hi All,<div><br></div><div>Looks like Brad accidentally only sent this message to a few of us. Since we have so much time I think we can take at least two data points every day using cosmics. So we will try to do that.</div><div><br></div><div>Best,</div><div>Sean<br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">---------- Forwarded message ---------<br>From: <strong class="gmail_sendername" dir="auto">Brad Sawatzky</strong> <span dir="auto"><<a href="mailto:brad@swatter.net">brad@swatter.net</a>></span><br>Date: Fri, Nov 19, 2021 at 8:15 PM<br>Subject: Re: Fwd: [Sbs_gems] GEM HV scan with new resistors<br>To: Ezekiel Wertz <<a href="mailto:ewertz@email.wm.edu">ewertz@email.wm.edu</a>>, Brad Sawatzky <<a href="mailto:brads@jlab.org">brads@jlab.org</a>><br>Cc: Thir Gautam <<a href="mailto:tns.gautam@gmail.com">tns.gautam@gmail.com</a>>, Xinzhan Bai <<a href="mailto:xb4zp@virginia.edu">xb4zp@virginia.edu</a>>, Jeffas, Sean (sj9ry) <<a href="mailto:sj9ry@virginia.edu">sj9ry@virginia.edu</a>><br></div><br><br><div>We will not have any beam until Tuesday swing at the earliest, probably later.<br><br>If this scan can be done with cosmics (slowly...) Then perhaps it may be worth doing some of this over the weekend?<br><br><div class="gmail_quote">On November 19, 2021 7:01:03 PM EST, Ezekiel Wertz <<a href="mailto:ewertz@email.wm.edu" target="_blank">ewertz@email.wm.edu</a>> wrote:<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr"><div>Hi Brad,</div><div><br></div><div>I think you are on the GEM mailing list so you probably saw this discussion. At the time of the RC meeting this afternoon I thought the table of points for the efficiency scan was set in stone. But that seems less clear to me now. Anyway I know we will not be going above 3653 (4100 equiv) V and I suspect we will go down to 3385 (3800 equiv) V via the attached email. Thir is currently the GEM on-call and his number is on the whiteboard. I know Xinzhan is on some shifts over the weekend. So depending on the timing of beam return and this task he might be able to do it as well. It's not entirely clear to me if Kondo and Nilanga have come to a consensus on the best form of the efficiency scan they would want. But maybe the UVa folks have more knowledge that I am unaware of. <br></div><div><br></div><div>Zeke<br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">---------- Forwarded message ---------<br>From: <b class="gmail_sendername" dir="auto">Holly Szumila-Vance</b> <span dir="auto"><<a href="mailto:hszumila@jlab.org" target="_blank">hszumila@jlab.org</a>></span><br>Date: Fri, Nov 19, 2021 at 4:09 PM<br>Subject: [Sbs_gems] GEM HV scan with new resistors<br>To: <a href="mailto:sbs_gems@jlab.org" target="_blank">sbs_gems@jlab.org</a> <<a href="mailto:sbs_gems@jlab.org" target="_blank">sbs_gems@jlab.org</a>><br></div><br><br>
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<p class="MsoNormal"><span style="font-size:11.0pt">Hi Kondo, Nilanga, all, <u></u>
<u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I realize the voltage scan doesn’t need good alignment, but right now the alignment was showing the new HV layer with about 14% occupancy, which is why I brought up the point about making sure alignment will
be somewhat ready. Andrew says it will be, so we should be able to see in real time if we are getting plateaus.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The HV scan we completed previously consisted of running:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">3385 (3800 equiv)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">3430 (3850 equiv)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">3475 (3900 equiv)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">3519 (3950 equiv)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">3564 (4000 equiv)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">3608 (4050 equiv)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">3653 (4100 equiv)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">3697 (4150 equiv)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">3720 (4175 equiv)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Can we reduce some of these points? Should we stay below 3653V or some other limit? These values correspond to the divider before modification.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Holly<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
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</blockquote></div><div style="white-space:pre-wrap"><div>-- <br>Sent from my Android phone with K-9 Mail. Please excuse my brevity.</div></div></div></div></div></div>