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<div class="WordSection1">
<p class="MsoNormal">Hi John, <o:p></o:p></p>
<p class="MsoNormal">This looks great <o:p></o:p></p>
<p class="MsoNormal">Excellent results <o:p></o:p></p>
<p class="MsoNormal"><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>
<p class="MsoNormal"><b>From:</b> John Boyd <jab7bp@virginia.edu> <br>
<b>Sent:</b> Friday, December 3, 2021 3:01 PM<br>
<b>To:</b> Brad Sawatzky <brads@jlab.org>; Gnanvo, Kondo (kg6cq) <kg6cq@virginia.edu>; Liyanage, Nilanga K (nl8n) <nl8n@virginia.edu>; Bogdan Wojtsekhowski <bogdanw@jlab.org>; Bai, Xinzhan (xb4zp) <xb4zp@virginia.edu><br>
<b>Cc:</b> sbs_gems@jlab.org<br>
<b>Subject:</b> First* cluster maps of the SBS GEn-RP GEMs<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">To all,<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">This past Wednesday, I showed some very preliminary cluster maps of the GEMs on the GEn-RP stack. The plots were "hot off the press". Since then we were able to correct some issues with the setup (cable/hardware issues, decoder issues,
etc.). With those changes we have seen quite a bit of improvement. The plots are attached.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Please reference these plots for my next comments.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Layer 0 is missing because there is no Layer 0 in the setup. Layer 0 would be the INFN GEMs and they are currently not installed in the setup. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">The plots are oriented with G0 (top GEM) on the left, and G3 (bottom GEM) on the right.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Layers 1-6 are the Inline Stack and Layers 7 & 8 are Layers 0 & 1 in the Right Polarimeter stack, respectively.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">ISSUES/CONCERNS:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Layer 1: Looks okay to me. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Layer 2: <o:p></o:p></p>
</div>
<div>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l5 level1 lfo1">
G1 shows a section of low efficiency. One suggestion for the cause of this is that the MPD may be causing some issue with this efficiency. <o:p></o:p></li></ul>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Layer 3: Looks okay to me apart from some strips in G2. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Layer 4: <o:p></o:p></p>
</div>
<div>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo2">
G0 has a 12-slot APV which was determined to be faulty. This was determined through preliminary testing (libtest, etc.).
<b><i>It is disabled and shows this as expected.</i> </b><o:p></o:p></li></ul>
<div>
<p class="MsoNormal">Layer 5:<o:p></o:p></p>
</div>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3">
G3 shows some suspicious strips but everything looks okay to me. <o:p></o:p></li></ul>
<div>
<p class="MsoNormal">Layer 6:<o:p></o:p></p>
</div>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo4">
G2 has a 5-slot APV which was loose during this run. I was able to push it in and feel it connect better. I have not taken another set of runs since I did this. I believe this should resolve the issue. I will take new runs and confirm.<o:p></o:p></li></ul>
<div>
<p class="MsoNormal">Layer 7:<o:p></o:p></p>
</div>
</div>
<div>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l4 level1 lfo5">
G2 has a 12-slot APV which was presumed to be faulty. The guess is that it is loose.
<b><i>It is a "lower" GEM in the layer and the 12-slot backplane is "hidden". We cannot access the APVs to try and push it in.
</i></b> It was not disabled and thus you can see some hits.<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l4 level1 lfo5">
G3 has a dead sector. This was known from the past.<o:p></o:p></li></ul>
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<p class="MsoNormal">Layer 8:<o:p></o:p></p>
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<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo6">
G3 has a dead sector. This was also known in the past. <b>Layers 7 and 8 were lined up in this fashion so that the dead sectors will overlap (if you put them back to back the dead sector is in the same place).</b><o:p></o:p></li></ul>
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<p class="MsoNormal">All in all, the layers look good. This also is in line with the previous summary that out of the 704 APVs in this setup, 1 is faulty (disabled) and 2 are suspicious/loose. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">We will continue to take more data and check back in on the status of the setup.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">John Boyd<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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