[Pansophy] Fw: C100 WG serialization

[Megan McDonald]

Just for record keeping

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________________________________
From: Paul Carriere <carriere at jlab.org>
Sent: Wednesday, June 25, 2025 7:09:17 AM
To: Katherine Wilson <kwilson at jlab.org>
Cc: Megan McDonald <megan at jlab.org>; Michelle Oast <weinmann at jlab.org>
Subject: C100 WG serialization


Hi Katherine,

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.

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.

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?

Thanks for your insight,

Dr. Paul Carriere
Jefferson Lab – SRF Fabrication Engineer
757.269.7645

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