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<div><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">Just to clarify, the total 800 capacitors would not be needed by the 10<span><sup>th</sup> of January.</span></span></div>
<div><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">But there would need to be a significant number done before then so they would be able to start the installation.</span></div>
<div><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">After that, the fabrication work and the installation work can run in parallel.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Amrit Yegneswaran <yeg@jlab.org><br>
<b>Sent:</b> Thursday, December 15, 2022 11:10 AM<br>
<b>To:</b> Dsg-hallc_nps@jlab.org <dsg-hallc_nps@jlab.org>; Aaron Brown <ambrown@jlab.org><br>
<b>Cc:</b> Fernando Barbosa <barbosa@jlab.org>; Patrizia Rossi <rossi@jlab.org><br>
<b>Subject:</b> Re: met with Bogdan</font>
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<div class="x_elementToProof"><span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0); background-color:rgb(255,255,255)">so 800 caps in ~10 days!</span></div>
<div class="x_elementToProof"><span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0); background-color:rgb(255,255,255)">almost twice the rate of the french!<br>
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<div class="x_elementToProof"><span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0); background-color:rgb(255,255,255)">(this is a challenge even for our wonder woman!)<br>
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<div class="x_elementToProof"><span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0); background-color:rgb(255,255,255)">(in the mood i am the cushion would be useful for those who didn't plan on this)<br>
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<div class="x_elementToProof"><span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0); background-color:rgb(255,255,255)"><br>
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<div class="x_elementToProof"><span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0); background-color:rgb(255,255,255)">mindy if you can please start and interlace it with your JEF-FCAL work.</span></div>
<div class="x_elementToProof"><span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0); background-color:rgb(255,255,255)">i think FCAL stuff is not needed till may 2023</span></div>
<div class="x_elementToProof"><span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0); background-color:rgb(255,255,255)">you can decide how to proceed.<br>
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<div class="x_elementToProof"><span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0); background-color:rgb(255,255,255)">contact me if you have a problem.<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Dsg-hallc_nps <dsg-hallc_nps-bounces@jlab.org> on behalf of Aaron Brown via Dsg-hallc_nps <dsg-hallc_nps@jlab.org><br>
<b>Sent:</b> Thursday, December 15, 2022 10:59 AM<br>
<b>To:</b> Dsg-hallc_nps@jlab.org <dsg-hallc_nps@jlab.org><br>
<b>Cc:</b> Fernando Barbosa <barbosa@jlab.org><br>
<b>Subject:</b> [Dsg-hallc_nps] met with Bogdan</font>
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Hi Amrit and Mindy, </p>
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Tyler and I spoke to Bogdan this morning regarding the addition of a capacitor to the PMT divider bases for NPS. </p>
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It looks like they have found that the frequency band of the low voltage amplifier is too large and is generating noise. </p>
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The thought is to chop the frequency band by adding a capacitor (~500 pF) on the output of the divider base (think low-pass filter). </p>
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The attached photo shows the output of the divider base with a capacitor already installed. </p>
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Approximately 150 dividers have been equipped with capacitors already. </p>
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The dividers with the capacitors already installed will be tested before the holiday shutdown. </p>
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If the test goes well, they would like to start installing capacitors on the remaining divider PCBs. </p>
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There are ~800 capacitors that will need to be installed. </p>
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These are already on-hand (Chris Stanislav has them). </p>
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This would be time sensitive work. </p>
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The French team will be returning to the lab around January 10, 2023 to complete installation/instrumentation. </p>
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They can install between 40 and 50 PMTs (including dividers and shielding) per day, so there would need to be at least 50 to 100 completed before January 10. </p>
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This would provide a kind of cushion between their install rate and the availability of completed dividers. </p>
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I’m not sure what Mindy’s work load looks like at the beginning of next year, but does it seem like this is something DSG can do?
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-- Aaron</p>
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