Source ran nicely overnight. ICR team set up a tune into the Polarizer line. Experiment setup is scheduled to start tomorrow morning.

Beam was used yesterday. Mostly idle overnight. Looks like a plasma mode change happened at around 19:00 yesterday. It happens. Or perhaps just an artifact again. Shortly after, beam was moved to 87Rb, which is where it is right now. Once again, another milestone first at OLIS: 87Rb from the MWS.

Natural abundance of Rb: Rb-85   ( 72.165% ) Rb-87  ( 27.835% )

Later... Beam switched back to 85Rb.

The 85/87Rb run from the MWS ended last evening as scheduled. The Supernanogan source was brought online (~21:30 Sunday?) and a 12C2+ beam established, first for ICR training then for DRAGON setup.

A good 12C2+ beam was established yesterday from the Supernanogan source, driven by background pressure only; no source gas actively injected. Beam intensity was not sufficient, so we switched to the MWS. 12C2+ from the MWS sat on FC6 for the night, and grew over the time. Plan today: increase the intensity one way or another.

Later... We're going with the Supernanogan for this one. CO source gas set up via MWS gas manifold. Differential pressure over variable leak provides low enough flow. RF scan in progress presently ~15:00.

12C2+ beam established yesterday from the Supernanogan. Tuning to DRAGON began last evening and is continuing presently.

We noticed that MCOL0 no longer has a valid reading. A quick trar suggests it stopped reading at around 17:00 yesterday, right around the beam hand-off time. Also, after working fine since Controls adjusted it a couple of weeks back, the MCIS:RFS water flow meter began toggling its state again around the same time, and a defeat was required to run the RF.

We are back to running a Rb beam using the MWS. The run started last Thursday, November 18th. The previous Rb run ended on Monday, November 8th, at which point a 12C2+ beam was established, using both sources; the Supernanogan was selected for final delivery to DRAGON. Users reported excellent beam. That run ended last Monday, November 15th, after which time source development ensued. Among other activities, the Supernanogan plasma chamber was opened and cleaned following the 12C run.

Last day of 85Rb delivery. Save: 101124_1400_snapiostitan. Next up: 12C2+ for SEBT commissioning. We took a few minutes earlier to see if this is available with the source as-is. No such luck. Plan is to shut off mid-afternoon, and prepare to switch over to 12C2+ operation from the MWS.

Source switchover began at ~15:00.

Some start-up teething pains last night. Decision: Go with the Supernanogan for now. ~20enA on FC6. Save: 101125_1148.snapiosdragon. Also, a CANBUS card on IOS:YCB1A failed this morning and was replaced by Controls.

Supernanogan is online. MCIS:TP3 is off. It should be on. It is required for best production of higher charge states.

Commissioning and development continue.

Continuing from Supernanogan. Source touch-up last evening.

Accelerator development continues. Save: 101201_2157.snaiosvault. Today's agenda: emittance scans. Attached: overnight beam plus a preliminary horizontal emittance scan 101202_0951ILTEMIT.txt.

Later... First good scan 101202_1016ILTEMIT.txt.

Next... Second scan 101202_1016ILTEMIT.txt with FC at lower gain, due to lots of red in the first scan. Too noisy.

Next... Third scan 101202_1041ILTEMIT.txt, first the raw pic, then filtered a couple of ways.

Scanner parked, and beam on FC6 again. There is interest in doing a vertical scan. This will require physically moving the emittance rig to the perpendicular face of its diagnostics box. Awaiting decision.

Last moments of beam development for SEBT commissioning. Attached is an FC6 plot and the present optics and 1mm slits. Decision was to not do a vertical emittance scan at this time, but proceed with 15Kr development, up next. Before we shut off, one last emittance scan coming up.

Later... Emittance scan with 2.5mm slits (default position setting used) in progress... Done. 101203_1017ILTEMIT.txt. Looks a little boxy... Both raw and cleaned-up versions attached.

Next: Emittance scan with 5mm slits... Done. 101203_1039ILTEMIT.txt. Looks a little more boxy... Both raw and cleaned-up versions attached.

Next: Repeat scan with original 1mm slits and scanner settings... Done. 101203_1104ILTEMIT.txt. It reproduced. Both raw and cleaned-up versions plus scanner panel attached.

Next: Quick look at 16O beams before shutting off...

The previous 12C2+ development run from the Supernanogan ended Friday morning. Starting Friday afternoon, the Supernanogan was prepared for an upcoming SEBT development using krypton beams. The source was ready overnight. There were some teething pains over the weekend. An A/q=5.71 beam is sitting on FC6 presently. The beam schedule shows an experiment change on Thursday morning.

Later... Some notes about krypton.

Naturally occurring isotopes:
Kr-78   ( 0.35% , 2.0E+21 ) Kr-80   ( 2.25% ) Kr-82   ( 11.6% ) Kr-83   ( 11.5% ) Kr-84   ( 57.0% ) Kr-86   ( 17.3% )

Some A/q values:

• 40/7 = 5.7143
• 80/14 = 5.7143
• 82/14 = 5.8571
• 82/15 = 5.4667
• 83/15 = 5.5333
• 84/15 = 5.6
• 86/15 = 5.7333

Keerthi's mass scans from Saturday:

1. Background scan
2. Krypton scan (note multi-peaks in A/q = 5.7 to 5.75 range)
3. FC6 at A/q=7.3333

Development should continue today. Looks like Supernanogan went through a plasma mode change overnight and settled into a new mode.

Beam development started yesterday. Looks like the HERACLES run, which started Thursday, ended yesterday morning.

Source development in preparation for Au beam in progress.

Development continues in the search for gold. A=197 Present A/q=5.94, which suggests 197Au+33. It could also be a tail of 12C+2. We'll see.

Development and the quest for gold continue.

Later... Mass scans in region of 197Au33 A/q=5.97, with graph of all theoretically possible charge states in the same A/q region. The thing to note in that last graph is how clean is the region (just left of A/q=6) where 197Au33 is predicted.

Later... Panning for gold ended prematurely due to a decision to end. The reason cited was DSB:MB14.