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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Paul Carriere <carriere@jlab.org><br>
<b>Sent:</b> Wednesday, June 25, 2025 7:09:17 AM<br>
<b>To:</b> Katherine Wilson <kwilson@jlab.org><br>
<b>Cc:</b> Megan McDonald <megan@jlab.org>; Michelle Oast <weinmann@jlab.org><br>
<b>Subject:</b> C100 WG serialization </font>
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<p dir="ltr" style="line-height:normal; margin:0px 0px 16px"><span style="font-family:system-ui; font-size:17px; color:rgb(0,0,0)">Hi Katherine,</span></p>
<p style="line-height:normal; margin:0px 0px 16px"><span style="font-family:system-ui; font-size:17px; color:rgb(0,0,0)">Megan McDonald is helping me conduct a post-mortem analysis on the recently completed C100R-03 cavity string assembly. This is the first
hermetic C100 cavity string—a milestone largely attributable to improved lapping procedures for the cavity Nb55Ti flanges, the introduction of a fly-cutting operation on the small flange (enhancing flatness and surface finish), and the replacement of the knife-edge
seal on the waveguide warm window with an internal weld.</span></p>
<p style="line-height:normal; margin:0px 0px 16px"><span style="font-family:system-ui; font-size:17px; color:rgb(0,0,0)">Anyways, I was hoping you could help me with a historical item related to the waveguides. While reviewing historical records of the, I noticed
that there were no “G” series waveguides installed in the original C100 CM builds, only “F”. However, these G serial numbers appear in the C100R builds. Based on older PRs related to Calorstat, it looks like two purchase requests were released in 2010—one
by you and one by Ed Daly—for additional waveguides (quantities of 58 and 12, respectively). I've compiled the details in the spreadsheet snip below for reference.</span></p>
<p style="line-height:normal; margin:0px 0px 16px"><span style="font-family:system-ui; font-size:17px; color:rgb(0,0,0)">My question is: were the “G” series waveguides part of your original PR but never installed in the original C100 cryomodules—and instead
later used in the F100 series?</span></p>
<p style="line-height:normal; margin:0px 0px 16px"><span style="font-family:system-ui; font-size:17px; color:rgb(0,0,0)">Thanks for your insight,</span></p>
<p style="line-height:normal; margin:0px 0px 16px"><span style="font-family:system-ui; font-size:17px; color:rgb(0,0,0)"><b>Dr. Paul Carriere</b><br>
Jefferson Lab – SRF Fabrication Engineer<br>
757.269.7645</span></p>
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