Helium spraying this afternoon has been inconclusive - intermittent response has been sufficient to keep us interested but we were not able to pinpoint any source. Maybe leakage through the annulus and orings.

We decided to try starting up the BSC10 RGA.

After finding and resurrecting the computer and controller we found that the controller would not power up. Retreived another unit from YMID, installed it, and found filament emission error on startup.

Documentation shows the last operation of this RGA was in 2008.

We will continue on Monday. I am starting to wonder if this can just be a very saturated system as we were vented for 3 months while the cartridge install was performed. For this period the iLIGO stack in BSC10 was exposed to the purge air.

Kyle,Gerardo,John