[Pansophy] Fw: C100 WG serialization

Mon Jun 30 09:24:13 EDT 2025

All,

Attached is the Inventory History for the CRM1207070-0000 Waveguides for reference.

A couple of notes:

  1.  The serial numbers have a mix of ‘/’ and ‘-‘, please ignore these.  The serial numbers are written as a Batch & Serial Number combination.
  2.  Any P.O. Number with a PROJECT-FOS (Found/Fabricated On Site) is used to transfer items from one project to another, as requested, or to enter parts that are fabricated in-house.
  3.  P.O. Numbers are only entered when parts are first received for a project.

Let me know if you have any questions.

Mike Dickey
SRF Inventory Technician
Jefferson Lab
12000 Jefferson Ave
Newport News, VA 23606
(757) 269-7755

From: Pansophy <pansophy-bounces at jlab.org> On Behalf Of Megan McDonald via Pansophy
Sent: Monday, June 30, 2025 8:18 AM
To: pansophy <pansophy at jlab.org>
Subject: [Pansophy] Fw: C100 WG serialization

fyi to keep in the loop
________________________________
From: Paul Carriere <carriere at jlab.org<mailto:carriere at jlab.org>>
Sent: Monday, June 30, 2025 7:30 AM
To: Katherine Wilson <kwilson at jlab.org<mailto:kwilson at jlab.org>>
Cc: Megan McDonald <megan at jlab.org<mailto:megan at jlab.org>>; Michelle Oast <weinmann at jlab.org<mailto:weinmann at jlab.org>>
Subject: RE: C100 WG serialization

Thanks for response Katherine. And yes, there were a host of mods and engineers involved. Megan has done some digging for me on this after I sent this message and I’m to understand that no G-series WGs are in the C100 cryomodules, but there are some in the F100 cryomodule.

Also, there are WGs in the C100R cryomodule.

On a related note, I was able to chat with Ed Daly during the EIC wrap up this week and he gave me some useful insight into the fabrication process. Apparently, Calorstat partially hydroformed the bellows, plated them, then finished hydroforming because of issues of throwing power of the internal plating process, as well as the brittleness/adhension issues associated with the UHV-grade RF copper plating. Technically, this makes sense to me, but is a major pain from a supply chain perspective.  Ed mentioned that Tiffany Gainey had apparently put a report together on refurb of the WGs and I think we will face to face with her this coming week to discuss.

Thanks again;

-pc

From: Katherine Wilson <kwilson at jlab.org<mailto:kwilson at jlab.org>>
Sent: Saturday, June 28, 2025 12:30 PM
To: Paul Carriere <carriere at jlab.org<mailto:carriere at jlab.org>>
Cc: Megan McDonald <megan at jlab.org<mailto:megan at jlab.org>>; Michelle Oast <weinmann at jlab.org<mailto:weinmann at jlab.org>>
Subject: Re: C100 WG serialization

Hi Paul, interesting question.  This was an old contract that had many mods and went through several engineers, so I'm not sure I have all the files.  As far as I can tell from my old files, all the waveguides I handled are F series.  I think the best place to look to narrow this down would be the waveguide inspection travelers, which should document serial numbers and when we received (or at least inspected) them.  AND I WOULD HAVE DONE THIS IF SRF WOULD STOP LOCKING ME OUT OF PANSOPHY, MEGAN.  🙁

Unfortunately, the SOWs don't seem to specify how to serialize, so this was probably something that meant something to the vendor.  If you can narrow down the date, we can figure out the applicable contract mod.

Regards,

Katherine

________________________________

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