<div dir="ltr">Hi Nilanga,<div><br></div><div>You are absolutely right, I messed up the table for M5. I will adjust the voltages as you suggest for M5 and M6</div><div><br></div><div>Best,</div><div>Sean</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Oct 15, 2022 at 12:43 AM Liyanage, Nilanga K (nl8n) <<a href="mailto:nl8n@virginia.edu">nl8n@virginia.edu</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 class="msg6922363514175517089">
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Hi Sean</div>
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Thank you for completing this analysis quickly; the results look very nice.</div>
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I have a couple of questions:</div>
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<li>Looks like there is a mismatch between your tables and plot. For example, according to the table, for M5 at 3650 V, the efficiency is 78%, but according to the plot it is 84%</li><li>I would argue that looking at your data, for M5 and M6 the suggested voltage of 3650 V is too low. I would suggest at least 3700 V for these two modules.</li></ol>
<div>Best</div>
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<div id="m_6922363514175517089divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Sbs_gems <<a href="mailto:sbs_gems-bounces@jlab.org" target="_blank">sbs_gems-bounces@jlab.org</a>> on behalf of Sean Jeffas <<a href="mailto:sj9ry@virginia.edu" target="_blank">sj9ry@virginia.edu</a>><br>
<b>Sent:</b> Friday, October 14, 2022 11:46 AM<br>
<b>To:</b> <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>
<b>Subject:</b> [Sbs_gems] [EXTERNAL] BB GEM Efficiency Results</font>
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<div dir="ltr">Hello All,
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<div>We have completed the BB HV efficiency scans. See full results here, <a href="https://logbooks.jlab.org/entry/4055432" target="_blank">https://logbooks.jlab.org/entry/4055432</a>. As listed our HV settings will be:</div>
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<div><span style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">UV Layer 0 - 3650 V</span><br style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">
<span style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">UV Layer 1 - 3600 V</span><br style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">
<span style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">UV Layer 2 - 3600 V</span><br style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">
<span style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">UV Layer 3 - 3600 V</span><br style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">
<span style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">XY Mod 4 - 3600 V</span><br style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">
<span style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">XY Mod 5 - 3650 V</span><br style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">
<span style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">XY Mod 6 - 3650 V</span><br style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">
<span style="color:rgb(49,49,49);font-family:"Trebuchet MS","Helvetica Neue",Arial,Helvetica,sans-serif;font-size:14px">XY Mod 7 - 3600 V</span><br>
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<div>These numbers have been chosen as the beginning of the efficiency plateau. They all produce above 86% efficiency Please feel free to respond if you look at the graphs and think they should be different. Generally we are comfortable with all the GEMs operating
up to 3650 V, so we can reasonably increase some of them.</div>
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<div>Efficiency plateaued a bit earlier than I expected. For example UV layer 2 was used in GMn and we found it was 84% efficient at 3600 V, meanwhile for this run we found it is 92% efficient at the same voltage. I wonder if the new CM calculations are causing
this improvement. Regardless we will run like this for now, and increase the voltage if there are any issues when we start taking production data.</div>
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<div>Best,</div>
<div>Sean</div>
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