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| | = Minutes = | | = Minutes = |
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| − | Participants: Bill, Dave, Mark, Simon, Beni, Eugene, and Lubomir. | + | Participants: Fernando, Bill, Dave, Chris, Nick, Simon, Beni, Eugene, Glenn, and Lubomir. |
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| − | == New results from the oxygen studies == | + | == Final results from the oxygen studies == |
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| − | - Latest results linked above, starting from configuration #19: applying vacuum grease (Apiezon (L)) on two EPDM O-rings in the testing chamber resulted in a record low oxygen of 50ppm. Without Apiezon with the same configuration we had 405ppm. It means we had significant oxygen contribution from the bottom cathode surface against the top O-ring on the spacer, that was eliminated with the grease. It turned out, however, the grease reacted with the EPDM swelling it and making it inelastic, but at the same time sealing the surfaces. We repeated the same experiment with Viton (that doesn't react with Apiezon) and got 70ppm oxygen. Based on this we decided to use Viton with Apiezon for the production. | + | - |
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| − | - Oxygen estimate for the full package: Based on the latest tests one has to count not the number of the O-rings but the "bad" surfaces. The Lexan, plastic surfaces and the Hysol-ed ones are considered good. That's why we have one bad surface (bottom of the cathode) in the testing package and in the production cell we have 4. Assuming 40ppm comes from the supply gas, one bad surface contributes 30ppm, so with the same flow of 220ccpm we will have 120ppm. Therefore at 80ccpm per cell or 480ccpm total for the package, we expect 330ppm (0.03%).
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| | == Production == | | == Production == |
Revision as of 15:29, 26 April 2012
April 26, 2012 FDC meeting
Agenda
- Final results from the oxygen studies (Lubomir)
- Production Construction Tracking (Dave)
- Production status
- Third package refurbishment status
- Third package tests (Lubomir)
- Engineering update (Bill)
- Electronics update (Chris)
- Tests with first package at 126 (Beni)
- Other
