[John, Gerardo, Chandra]

John wanted to spray some helium for himself, so we spun the x-beam manifold back up and sprayed all BSC7 conflats again, in addition to IP6 isolation GV and GV4 triple flange. He sprayed He at a KF connection at the leak checker and found a e-9 Torr-L/s range leak, which could have been what Kyle and I detected last week while testing GV7.

John noticed the BSC7 annulus ion pump's reading on front display was not clear i.e. the green LED lights were fading into 6 mA + range rather than clear-cut lit vs. non lit. He tapped on the pump and power cycled the controller a few times. It seems to be reading clearly now at 2 mA. We thought if there was an internal o-ring leak and the annulus ion pump wasn't working properly, that annulus space could be the source of pressure rise in x-beam manifold. We connected an aux turbo cart to that pump and accidentally partially vented the annulus space and then pumped it back down. No change in volume pressure though, which leads us to believe that there is no internal o-ring leak. The AIP is pumping on its own again at 2 mA.

We left the x-beam manifold turbo running and valved out for the night. IP6 is valved back in. While IP6 was valved out during leak checking, its power supply read 172 uA. When valved in, it reads 520 mA. IP5 on y-beam manifold reads about 90 uA (valved in), so we still may conclude that the reason for the pressure rise in x-beam manifold when isolated compared to y-beam manifold is due to difference in IP pumping speed. When IP6 is valved out, we expect it to read even better than IP5 valved in. One thing we didn't check is the IP flange above the gate valve. We should leak check that flange while the IP is valved in. We've sprayed it a few times now, but we always keep the IP valved out during leak checking. When IP is reopened we detect some He in -9 range (no surprise), but.....