[Pansophy] Cold FPC Incoming Inspection Documents

Mon May 24 12:27:35 EDT 2021

Hi Mircea,

Thank you for the feedback. I'll implement the following changes to the documents (below in red)

Thanks,
Naeem

________________________________
From: Mircea Stirbet <stirbet at jlab.org>
Sent: Monday, May 24, 2021 11:30 AM
To: Naeem Huque <huque at jlab.org>; Danny Forehand <forehand at jlab.org>; Kirk Davis <kdavis at jlab.org>; Katherine Wilson <kwilson at jlab.org>; John Hogan <hogan at jlab.org>; Chris Dreyfuss <dreyfuss at jlab.org>; pansophy <pansophy at jlab.org>; Jacob Harris <jharris at jlab.org>
Cc: Mircea Stirbet <stirbet at jlab.org>; John Hogan <hogan at jlab.org>
Subject: Re: Cold FPC Incoming Inspection Documents

Hello,
These two documents still require some work, wander if these could be ready for upload in Docushare by tomorrow. Here you have some suggestions:

a) Vacuum leak checks on cold couplers, are mode demanding: during plastic bag check, the two N2 valves should be open, inside plastic bag to check at the same time the cold ceramic area. Then, if a leak is identified during plastic bag checks, the "bad" cFPC should be identified, eventually leak location properly documented,  to eventually sent it back to vendor to have it repaired or replaced.
Add a step to open the valve, and instructions for He spray leak check if a leak is detected

b) Incoming inspection in the cold ceramic area should be done after all external surfaces ( including cold ceramic protection cup and CF100 holes have been cleaned and checked) to be conform with external particulates requirements. This step is just before inspecting the internal coupler volume.
Will move the particulate count to before the electrical check and removal of the cap. Add a step to wipe down the assembly before the cap is removed

c) More details should be specified related with cold bellows inspections: SS transport protection should be removed, checked for particulate and should be damage free.
Will add a step to wipe down the protection bracket prior to re-install. Won't add a particulate count step here, but may do one on the first article inspection

d) If the two couplers (pair on the same test waveguide)  passed incoming inspection requirements, storage options should be better specified: if the cold couplers are stored in the N2 cabinet, the cold ceramic projection cups should not be not installed. If the cold couplers are stored on test stands ( this option is can be considered for a limited number of test stands ), the Pongy bolt,  cold ceramic protection cup should be installed, there is a certain bolting pattern for CF100 flange, the internal coupler volume as well as the cold ceramic cup should be kept under N2 over-pressure.
I don't plan to store these in the cabinets, instead preparing them before strings and storing temporarily. I'll add steps for the reinstalling the RF bolt and pressurizing with N2. Steps for storing in the N2 cabinet will also be added as an option.

e) Incoming inspection traveler should provide a link to vendors QA files.  And these vendor QA files should be checked BEFORE the couplers are shipped to the partner labs. It was a common practice during XFEL as well as for LCLS-II coupler activities
I won't have this has part of the HE procedure. Documents will be in the INV folders

f) Lets try to avoid using optional  in incoming inspection wordings. Is a risky, confusing term. And FE onset is till not properly understood and under control. We have to collect, process and use as much data we can during incoming inspection work ( this remark extend to SRF related activities, not only for power couplers).
Uploading the data files for the particulate checks is optional. I'll specify that a file is needed if there is an NCR. This was as per Danny's request

For sure there are more aspects to be considered. Have a look on the attached traveler / procedure, I developed based on my experience with couplers, in particular with LCLS-II couplers. There is a kind of order in performing incoming inspection on this type of couplers, and my  advice is to follow what we already know and have been proved to be adequate.

Take care and be safe,
Mircea.

________________________________
From: Naeem Huque <huque at jlab.org>
Sent: Saturday, May 22, 2021 11:27
To: Danny Forehand <forehand at jlab.org>; Kirk Davis <kdavis at jlab.org>; Mircea Stirbet <stirbet at jlab.org>; Katherine Wilson <kwilson at jlab.org>; John Hogan <hogan at jlab.org>; Chris Dreyfuss <dreyfuss at jlab.org>; pansophy <pansophy at jlab.org>; Jacob Harris <jharris at jlab.org>
Subject: Cold FPC Incoming Inspection Documents

Hello Everyone,

The inspection traveler and procedure for the HE cold FPCs are attached. Please let me know if you have any comments. I'll be sending them out for docushare approval by the end of Tuesday

Thanks,
Naeem

Naeem Huque
Staff Engineer
Superconducting Radiofrequency (SRF)
Jefferson Lab
12000 Jefferson Ave
Newport News
VA, 23606
Cell: 217-721-5422
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