Quick log describing effort to recover leaky IR Labs dewar.

POC Steve Zoltowski - Stevez@irlabs.com

No fix yet, so I reached out to the vendor for more ideas.

I'll post another log with a summary of what leak(s) we suspect and what the current behavior of the leak is.

Fix Effort 1 - Valve Housing Seal (attachment 1)

The fix IR Labs recommended was to look at the seal of the valve housing.
 - There was no sign of any issue with oxidation at any visible location.
 - The fluoroelastomer valve seat looks like it has crept (plastically deformed in the shape of the sealing surface underneath) but not dramatically.
 - The o-ring looked fine, but I wiped all surfaces and added a bit of Krytox to o-ring and valve seat.
 - Photos - https://photos.app.goo.gl/oa4bCxm7xaWRJZDj7

Conclusion: No change to the behavior of the leak.

Fix Effort 2 - Feedthrough Seal

I had not yet explored the seal of the feedthrough to the chamber, except to note that the screws are tight.

 - The feedthrough wire leads are plugged in within the chamber, and there is not enough slack on the leads to examine the o-ring. I removed the screws, found I had inadequate access, and replaced the screws.

Conclusion: Cleaning / reseating is deferred.

Fix Effort 3 - Window Seal

I had not yet explored the seal of the window to the chamber, except to note that the screws are tight.

 - The window looked ok during removal, and I had no reason to be concerned.
 - Removed the o-ring and wiped down o-ring and groove thoroughly with IPA. 
 - Applied Krytox to chamber-side sealing surface.
 - Wiped down chamber sealing surface.

Conclusion: No change to the behavior of the leak