(Travis S., Jordan V., Randy T., Gerardo M.)
Wednesday afternoon we had the opportunity to remove and replace the annulus ion pump body for BSC8 annulus system. To reach the ion pump body we used the scissor lift that Randy moved near the chamber.
No issues were encountered on the removal or installation of the ion pump body. The annulus ion pump system was evacuated and we left it pumping down with an aux cart and a small "can" turbo. On this system we used a noble diode pump, which required us to replace the controller for a positive one. Setpoints were set on the aux cart and at the end of the day the annulus system had reached below 5.0x10-05 Torr.
I powered on the ion pump yesterday morning. After pumping with both the ion pump and aux cart overnight, the IP current began decreasing, so I isolated the aux cart this morning. Ion pump was able to hold pressure no problem, so we disconnected the aux cart and brought it over for the HAM1/2 annulus pumpdown.