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HI Sean</div>
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Thanks for sending out the plan.</div>
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I would like to add one more thing: </div>
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here at UVa we have built the new HV divider boards with the resistance 3 times smaller than those on the UV chambers right now. These HV boards will significantly reduced the gain drop issue, and the efficiency for the UV chambers will stay close to 90% during
production. One question is whether pedestal noise would go up. </div>
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Vimukthi and Huong are starting to test these boards. They plan to get them fully tested using high intensity x-rays by January 5, or earlier.</div>
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If everything looks good by then, I suggest we replace the HV board of UV layer 4 before it is installed.</div>
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We can replace the boards of the other 3 layers, while they are in the stack.</div>
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Best</div>
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Nilanga</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Sbs_gems <sbs_gems-bounces@jlab.org> on behalf of Sean Jeffas <sj9ry@virginia.edu><br>
<b>Sent:</b> Wednesday, December 22, 2021 8:46 AM<br>
<b>To:</b> Sbs_gems@jlab.org <sbs_gems@jlab.org><br>
<b>Subject:</b> [Sbs_gems] [EXTERNAL] UV Layer 4 installation update</font>
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<div dir="ltr">Hi All,
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<div>Here is the list of tasks needed to install the UV layer in the hall. Barring any unforeseen issues the layer swap should happen on
<b>January 6th</b>. I have also attached a picture below where you can see the state of the UV layer. It has everything ready except for the APVs, which will be taken out of the hall on January 3rd.</div>
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<td style="overflow:hidden; padding:2px 3px; vertical-align:bottom; font-weight:bold; border:1px solid rgb(204,204,204)">
Schedule</td>
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Parallel Task 1</td>
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Parallel Task 2</td>
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1/3/2022</td>
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Put 3-slot BPs in UV layers in BB</td>
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<div style="float:left">Move UV to the test lab and set up HDMI cables</div>
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1/4/2022</td>
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Pedestal and comsic test on UV layer</td>
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1/5/2022</td>
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Resolve any issues</td>
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1/6/2022</td>
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Swap J0 with the UV layer</td>
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1/7/2022</td>
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Resolve any issues</td>
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1/8/2022</td>
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Weekend</td>
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1/9/2022</td>
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Weekend</td>
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1/10/2022</td>
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Resolve any issues</td>
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<div>Best,</div>
<div>Sean</div>
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