Yesterday I visited END Y and noticed that the BSC6 annulus ion pump was maxed out (red led). Also we have noticed that the pressure in the main volume has been cycling due to main ion pump voltage switching.

So, this morning Gerado and I reconnected the AUX turbo cart to the BSC 6 annulus and began pumping again. It appears the annulus had drifted up to ~1 torr. We do not know when the annulus ion pump railed - it may have been

due to a power interruption. This ion pump is not yet trended in the CDS but it looks like cabling is mostly complete. Gerardo is going to look into this.

To correct the cycling pressure in the main volume we programmed the main ion pump power supply to operate in "Fixed Voltage" mode at 5KV.