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<p class="MsoNormal"><span style="font-size:11.0pt">Hi all, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I don’t know if anyone had looked at the high current data taken at the last day last week, but the results on efficiency are quite interesting and at the opposite of our assumption so far specially regarding
HV current drop. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><a href="https://hallaweb.jlab.org/wiki/images/9/9f/LH2_high_beam_current_data.pdf">https://hallaweb.jlab.org/wiki/images/9/9f/LH2_high_beam_current_data.pdf</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The link shows the plots for <o:p>
</o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">Slide 1: LH2 @ 15 uA (production) and @ 20, 25, 30 34.5 uA (GEM studies)<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">Slide 2: LD2 @ 12 uA (production) and @ 34.5 (GEM studies)<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">In all cases GEM efficiency increases with beam current specially clear for the 4 modules of the last layer contrary to what we have been assuming so far.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Even for LD2 @ 34.5 almost 3 times the rate of production data at 12 uA, the efficiency are significantly higher for 6 of the 8 chambers.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">This is one more clue that when it comes to GEM efficiency, there is more to the story than gain drop in the GEMs and this need to be understood. There are al lot of GEM studies that need to be analyzed beyond
GEM current vs. beam current<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I don’t know if the GEM current were recorded during these high current runs. I am anticipating that we will discuss these findings tomorrow<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Best regards <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></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><span style="font-size:11.0pt">From:</span></b><span style="font-size:11.0pt"> Sbs_gems <sbs_gems-bounces@jlab.org>
<b>On Behalf Of </b>Holly Szumila-Vance<br>
<b>Sent:</b> Tuesday, February 15, 2022 1:55 PM<br>
<b>To:</b> Sbs_gems@jlab.org<br>
<b>Subject:</b> [Sbs_gems] SBS GEM Meeting Wednesday at 10:30am<o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt"><span style="font-size:12.0pt;color:black">Dear all,</span><span style="color:black"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black">We will have our weekly<span class="xapple-converted-space"> </span>GEM<span class="xapple-converted-space"> </span>commissioning<span class="xapple-converted-space"> </span>meeting<span class="xapple-converted-space"> </span>tomorrow
Wednesday 16, February at 10:30 am with the agenda:</span><span style="color:black"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="color:black"> <o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:12.0pt;color:black">- Sean, Zeke, Anu, Holly: update on the BB<span class="xapple-converted-space"> </span>GEMs</span><span style="color:black"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="color:black"> -Negative pulses<o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="color:black"> -NIM article interest?<o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black">- Anu, John & Thir: update the UVa<span class="xapple-converted-space"> </span>GEM<span class="xapple-converted-space"> </span>layers for GEn-RP</span><span style="color:black"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black"> -APV inventory</span><span style="color:black"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="color:black"> <o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="color:black">-Zeke: Update on INFN<span class="apple-converted-space"> </span>GEM<span class="apple-converted-space"> </span>layers for GEn-RP<o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black"> </span><span style="color:black"> <o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black">-DAQ updates</span><span style="color:black"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;color:black">Connection details:</span><span style="color:black"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black">=============</span><span style="color:black"><o:p></o:p></span></p>
<p class="p1" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black">Join ZoomGov<span class="apple-converted-space"> </span>Meeting:</span><span style="color:black"><o:p></o:p></span></p>
<p class="p1" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1610639586-3Fpwd-3DTnJoQ3Y5a29xR2RnNDl5eHhqVGRxdz09&d=DwMGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=NNRUDg2C8cJitJ467evUCKcfCgAu8FJaa8E-U6WOa6I&m=kyA1wnDrtE2Rry4-nZ2V7aszhYGTrE1KMIlBuEorsbKeY1-cich7_lOPsQQjo3Ce&s=nTrlsNrMFBVvHik5y3CH9L14Ry_mtoLNS-hJgKh4mvU&e="><span style="color:#954F72">https://jlab-org.zoomgov.com/j/1610639586?pwd=TnJoQ3Y5a29xR2RnNDl5eHhqVGRxdz09</span></a></span><span style="color:black"><o:p></o:p></span></p>
<p class="p2" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;color:black">Meeting<span class="apple-converted-space"> </span>ID: 161 063 9586</span><span style="color:black"><o:p></o:p></span></p>
<p class="p1" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black">Passcode: 316022</span><span style="color:black"><o:p></o:p></span></p>
<p class="p1" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<span style="color:black">Agenda:<span class="apple-converted-space"> <a href="https://hallaweb.jlab.org/wiki/index.php/Meeting_2022_02_16">https://hallaweb.jlab.org/wiki/index.php/Meeting_2022_02_16</a></span>
<o:p></o:p></span></p>
<p class="xmsonormal" style="margin:0in;margin-bottom:.0001pt;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;caret-color: rgb(0, 0, 0);word-spacing:0px">
<span style="font-size:12.0pt;color:black">=============</span><span style="color:black"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;color:black">-Holly</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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