(Janos C., Gerardo M.)

Old ion pump body was removed and replaced with a refurbished model type (Galaxy).  The annulus system was pumped down while the replacement took place.
After the 4-1/2" flange was torqued, the ion pump volume was added to the rest of the annulus system.  The aux cart pumping down the annulus system worked for 3 hours to get the pressure down, after pressure reached 4.5x10^-05 Torr, the ion pump took over the pumping with no problem, then after 20 minutes the aux cart and "can" turbo were removed.  System back to normal.