Gerardo M., Kyle R.
Today we helium leak tested the new joints on IP2 between the gate valve and chevron baffle nipple, the chevron baffle nipple and ion pump and both HV feedthroughs. IP2 was de-energized during testing and was pumped only by the leak detector via flex lines connected to the 1 1/2" pump port. The helium baseline (background) was < 3 x 10-9 torr*L/sec throughout testing as an audible flow of helium was applied slowly around the joints being tested. IP2 was later energized and left isolated so as to "dry out" from its recent exposure to air.
For HAM6, only the new 2.75" CFF fiber feedthrough was tested (Fabrice M.). For this case, the leak detector was used to back the 500 l/s turbo and the helium baseline stayed < 5 x 10-10 torr*L/sec
For HAM1, all 2.75" CFF feedthroughs on the South end were tested using the leak detector to back the 500 L/s turbo. The helium background stayed < 8 x 10-10 Torr*L/sec throughout.
On HAM1, TTBOMK, only D6-1 was changed and it is a 4.5" CFF; just saying.
I told them to leak check all because we weren't sure which port that is. It was just as fast to spray He on all vs. hunting you down to point to the flange. :)