A/q = 3.2 Field = 837.7G FC6 = 14.5enA

A/q = 3.6 Field = 888.6G FC6 = 6.2enA

A/q = 4 Field = 936.7 FC6 = 54.0enA

A/q = 4.5 Field = 993.5G FC6 = 20enA

A/q = 5.3333 Field = 1081.6G FC6 = 110nA

A/q = 6 Field = 1147.2 FC6 = 39.3enA

A/q = 8 Field = 1324.8G FC6 = 172enA

A/q = 9 Field = 1405.0G FC6 = 55enA

A/q = 16 Field = 1873.4G FC6 = 204enA

A/q = 18 Field = 1987.1 FC6 = 161nA

Here is a summary of emittances gleaned from the aforementioned elog entries.

 18O4+ restored onto FC6 ~20enA, which seems slightly low.

There are the last couple of hours of Supernanogan Development for this set. Our run plan included 17On+ studies. Time will not permit it this time around. Also, the emittance numbers of 16O and 18O are not distinctive enough as they stand to warrant studies of the in-between mass. Keerthi will run the emittance data files through his software during post-analysis, and we'll develop our next run plan based on his conclusions.

This morning I will redo a couple of emittance scans that were not optimal yesterday. We'll start with an 18O4+ emittance check, then 18O8+, where, though I don't expect an emittance scan, I do expect to see beam. A vacuum trip on Wednesday evening probably compromised source vacuum and therefore the ability to generate the higher charge states. Here we go.

18O4+ emittance checks well.

Go fishing in the range 2.24-2.26, but no fish in this pond this time. However, there is a relatively strong beam at 2.3.

A/q = 2.3 Field = 711.2 FC6 = 110enA

No emittance scan possible.

I did a check at A/q = 2, and found a strong peak at 2.04 field 668.8 18enA, suggesting that the A/q panel calibration is slightly off for the lower masses, and in the right direction for the above to indeed be 18O8+. Good stuff.

Next stop: 18O6+.

A/q = 3 Field = 813.9G FC6 = 2.2enA

I tweaked the adjustment of the displayed A/q calibration to fit this one.

A/q = 2.571 Field = 753.5 FC6 = 50epA

A/q = 2.2857 Field = 710.5G FC6 = 100pA

A/q = 2 Field = 667.3 FC6 = ~10enA

A/q = 2.666 Field = 767.1G FC6 = 3enA

Beam switched back to 18O4+ by 11:00 as agreed. Some glitches. Here are snapshots of how it looked at handover time.

Later... Sophia prefers using all previously-saved files including ion source. Okay.

Note: For fun, Controls took away isacwserv mid-morning. The ICR did not communicate to them that I was the user... Workaround done with Keiko.

The 18O4+ run at about 5MeV/u ended this morning with reasonable success, I'm informed, despite MCIS vacuum trips, SC cryo trips and a power bump for good measure.This morning I found beam at FC6 unstable. It appeared to be toggling between plasma states. A little tweak of a few MHz up in microwave frequency not only stabilized it but also multiplied the brightness. Too bad the users didn't have this beam. Emittance scan in progress now.

Next up: 21Ne to TUDA-II. We will begin preparations for switchover to MWS operation shortly. We are discussing a run plan now.

Check beam at FC6. Still toggling. Tweak RF from 15.4790GHz to 15.4823GHz, a change of a mere 3.3MHz, and amplitude from 8.470 to 8.670dB. The RF multiplied the intensity, and the amplitude locked the plasma mode. Sweet! Striptools and final RF settings attached. Too bad we have to shut it down now. Close isolation valves, MCIS optics off, vacuum off. Prepare to access cage. Note: Bias and EL could not be turned off via EPICS.