After accessing the OLIS cage and opening the 18O source gas valve, I restarted the Supernanogan source last evening around 18:00 ( just to the left of -15h on the attached stripchart), with the line set up for 18O4+. The beam on FC6 grew nicely overnight. MCIS pressure moved from ~6.5e-8 to ~7.1e-8 Torr since the 18O source gas bottle was opened last evening.