The MWS delivered 18O overnight, mostly onto FC6. Sophia complained about source stability this morning. It definitely could be improved. Yesterday Keerthi did some online tweaking of the RF power for stability, with little improvement. The IOS pressure today is about 2e-6 Torr, so I believe the 18O pressure is too high for good operation, although the brightness is great. The base pressure is about 4e-7 Torr. Tuning is in progress. Given an opportunity, I would like to try one or all of the following:

1. Tweak RF power

2. Change 18O gas delivery to use the calibrated leak

3. Leak check the IOS section. Vacuum Group knows we would like to do this on short notice.

Later... Marco denied time for a look-see, even when they are ruminating. I had stripped various things against beam current, and did not find a strong correlation except separator field. It is blazin' hot around here today, and for sure equipment is having a hard time. I had hoped to turn off the magstab program for a few minutes and see where things go. Marco's reply was, they are happy with the beam as it is. Done deal.