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.

Continuing from Supernanogan. Source touch-up last evening.

Commissioning and development continue.

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

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.

Source switchover began at ~15:00.

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.

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.

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.

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.

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.

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.

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

Yesterday we handed over a 85Rb beam to ICR. It will be used for a LEBT run using the Polarizer line. Beam stayed on FC6 overnight. Note the source spark at around midnight, after which the bias current readback was higher. Real or artifact?

Later... Beam status over last couple of hours. Looks like tuning has begun.

85Rb on FC6 overnight. After restarting the source yesterday following development, the beam intensity came back, but it's slightly unstable compared to before. Mag stability program is active.

Later... Work with the source for a while. Improved. Stripchart attached. Time will tell. Save: 101102_14:30.snapiosfc6. Turn it over to ICR now.

The source stayed up steadily over the weekend, with 85Rb on FC6. Not a lot of current, but pretty good for a first pass. More development today. Source settings shown below. As previously noted, the 2.5mm slits are selected. Also, the present IOS tune is for effect, not by the book.

Next up: Try some variations on the source setup.

MWS source switchover yesterday was successful. Leakchecking went well. A small leak on the intermediate section sealed with a snug on the two bellows fixing bolts. The microwave window required cleaning. It tested leak-tight. All good. Pumpdown curve to come. Meanwhile, source was restarted last night. First 85Rb is on FC6 presently. Although OLIS has run Rb beam in the past using the SIS, this is a milestone for the MWS. Development to proceed today.

Later... Here is the pumpdown curve to last night. Base pressure reached less than 3e-8Torr, which is a very good pressure for the MWS. Prepare to shut down leak detector, which has been pumping on the roughing line overnight.

Later... First piece of a comprehensive mass scan. Brings a tear to my eye. Save: 101029_1125.snapiosfc6

Later... Scans completed. Data file. Among other things, the following isotopes were observed:

A/q	Current	Isotopes
14	1.5e-09	14N
15	6.0e-11	15N
16	1.3e-08	16O
17	6.0e-10	17O
18	6.5e-09	H2O, 18O
19	1.7e-07	19F
20	1.3e-09	20Ne
21	7.0e-10	21Ne
22	1.4e-10	22Ne
28	4.2e-09	28Si
29	2.0e-09	29Si
30	4.2e-06	30Si, 60Ni+2
31	1.9e-08	31P
32	4.2e-07	32S
33	1.0e-09	33S
34	3.3e-09	34S
39	7.5e-10	39K
41	5.0e-11	41K
44	1.0e-10	44Ca
45	1.6e-10	45Sc, 90Zr+2
46	6.5e-08	92Mo+2
47	3.2e-10	47Ti
48	7.0e-10	48Ti
51	3.0e-10	51V
53	9.4e-10	53Cr
60	6.5e-11	60Ni
67	4.0e-10	67Zn
69	1.3e-10	69Ga
85	6.5e-10	85Rb
87	2.3e-10	87Rb

Spreadsheet
Scans Details

Attached is a separate scan in the region of 40 to 45, done in two directions. Data file (raw).

Leave 85Rb on FC6 for the weekend, or as long as it lasts! !1.3nA presently with 2.5mm slits in. I have increased the support gas flow slightly.

A controls issue with IOS:BIAS was found yesterday. Controls people resolved it today. MWS source was switched over and prepared for Rb beam. Leakchecking done: tight. Source should pump for a little while longer before energizing. At present, leak detector is attached to the IOS roughing line. Pic attached with IOS:BP1 alternately online and offline.

Note: Source gas hand valve is CLOSED.

A controls issue with IOS:BIAS was found yesterday. Controls people resolved it today. MWS source was switched over and prepared for Rb beam. Leakchecking done: tight. Source should pump for a little while longer before energizing. At present, leak detector is attached to the IOS roughing line.

Later... Noticed that MCIS:TP2 was tripped off. After a couple of tries, it restarted okay. Hmm...

The experiment ran overnight, smoothly, by the looks of it. Beam is on FC6 now, so they're likely done. EOB studies on Mg beam to commence shortly, with source teardown and switchover to Rb beam to follow..

Emittance scans in progress, first at as-delivered settings: 5mm slits. Save: 101027_1102>snapiosfc6

Emittance scans at 26Mg then 24Mg.

Next, go fishing for 85/87Rb in background. Not a lot of fish in this pond... Double-check tune at 24Mg: perfect.

Next up: comprehensive mass scan. Then most likely we will take down the source for clean-up and switchover to Rb beams. Abort due to technical difficulties.

Next up: I just noticed a readable beam at A/q=13.33. Well, that's odd. (We are running 40Ar support gas in the source.) Let's see if it's reproducible. Yep.

Now... IOS bias keeps tripping... Time to investigate... The FUG keeps blowing fuses on reset. But in local mode, it starts and runs just fine. We conclude that its CANBUS card is driving the FUG at full chat on reset. Anyway, F/R#4925.