Swiched off all the pumps and ion gauge for oven installation.

Keerthi found and fixed a couple more vacuum leaks last night. Present vacuum at IOS:IG1 = 4.4e-7 Torr. Electrical and water services installation in progress right now.

Later... Most of the services installed. Water tested: mostly OK, but persistent leaks on fiddly source body seals. Let Keerthi adjust these tomorrow. Power supplies wiring mostly done. A couple of source body connections await, plus primary power work by electricians. All in all, it's taking shape.

4He2+ "alpha" CUSP source under vacuum: IOS:IG1=7.3e-7 Torr. Electrical installations today.

I3 development source also at vacuum: 2.7e-6 Torr, which is better than when we started. TP gauge: 1.0e-7 Torr.

Later... Begin leak checking. Note: IOS:BP1 needs servicing. Its base pressure is ~30mT.

* Gas inlet on backplate already plugged off. Tighten. OK. Improvement in IOS:IG1.

 No other leaks found at this time.

Today we installed the CUSP "alpha" source on the MWS port at OLIS. It is vacuum-tight. Looking good. Also we installed remaining components on the prototype I3 source yesterday and pumped overnight. Vacuum there is good too. Next week is looking like a marathon source week. I also understand that a new target for ISAC tested well at the ISAC Test Stand today. A hat trick.

Pumps were switched off last night. IOS was vented to Ar and swiped clean this morning. MCIS ready for disembarking from F-cage. IOS:IV0 defeated so that we could vent the IM with IOS as one volume.

Later... Supernanogan cart is parked at its service dock. TP1 & 2 are up.

All turbos in the OLIS and MCIS are off. No controls for the MCIS. Pumps switched of by pulling the CG cable.

All the gate valves are off. All bypass are removed

After their EOB with 17O3+ yesterday, DRAGON switched to 21Ne4+ running for charge distribution studies. Keerthi changed over the source gases for that around 08:30 yesterday. Things went well. Beam intensity dropped off and leveled off overnight. I tweaked up the source just now. Current at H2:4 moved from xe-10 to ~1.5enA. A stripchart is attached. Orange trace is H2:4, and green is COL0, which reflects total beam from the source.

Later around 11:00... a controls event happened. Cleared all SPs, etc. Of course that turned off the source. Restart okay. 3.8enA on FC6. Beam observed to H:5 (energy change in progress). RF screenshot attached, and also what the Compare utility displays right now.

Later... around evening... DRAGON experimenters reported that delivered beam couldn't possibly be 21Ne, based on certain charge ratios they see and calculate. A couple of hours OTP with ICR to discern masses, in particular 20/21/22 series at +1 and +4 positions. We are pretty confident that 21Ne4+ (A/q=5.25) is sitting at ~1160G or so. Previous running had been at some 1170G, which we believe is the next peak up. (It later was found to be 16O3+, i.e. A/q=5.333.) Based on that setup, ICR attempted to get beam through the line. They got it as far as the front of the DTL, but that was it. Then they returned it to the higher field value and sent it through, but no joy for DRAGON.

Next day, Wednesday: Keerthi did careful mass scan and A/q re-calibration. Then Sophia looked at the situation. When she was done and the experimenters online by ~midday, the separator was reported sitting at 1160.75G. Separator field chart for the period is attached below; red is field, green is A/q. The run concluded uneventfully somewhere around 21:00 on Wednesday evening.

DRAGON declared EOB at around 08:00 today. Source and beam were switched to 21Ne4+ for calibration studies.

Beam and energy changes continued over the weekend. The ICR reports that things are going swimmingly, and that the users are happy. Scaler counts are up some 30% or so from Tuesday. All good. A source and line touch-up Wednesday (Remembrance Day) morning and a tuning effort following an energy change during the day on Wednesday produced strong and stable beam running.

Attached is a stripchart of the last day or so of running. The thick blue trace is the DRAGON scaler. The fine green trace is a source collimator, representative of total beam from the source and its stability. The spikes are periodic Faraday cup readings.

Beam ran well overnight. Last evening Vacuum Group diagnosed and repaired a catastrophic leak in the ILT cross region. You can see in the attached plot how venting that section caused elevated pressures in IOS, most likely due to the direction in which IOS:IV7 is installed. Most often it is the IOS section that is vented, and the neighbouring sections remain at high vacuum. So this gate valve would be installed looking downstream so that venting on the upstream side would tend to close the valve even harder. Yesterday was one of those rare times when the pressures were reversed, leaving only the spring tension of the valve maintaining vacuum in IOS. Pretty good, actually.

We are delivering a beam intensity exceeding the agreed rate. Intensity dropped off a little overnight, and it is pretty evident that it correlates with a higher vacuum in MCIS, suggesting that the 17O2 source gas flow has also dropped off. There is ample headroom presently, but the users may request a tweak after the energy change (in progress circa 09:00) and checks are complete.

Later... ICR requested a source tweak, which we did. A little increase.

Beam delivery continued through the weekend. As noted on Saturday, current dropped precipitously due to source gas pressure. We have 2.3e-6eµA this morning.

17O+3 at FC6 became 550nA.

17O hand valve found to be closed. Probable cause may be the cold weather.

After opening the valve beam came back. 2.6uA of 17+3 at FC6.

Notes by DMG 8-Nov-2009:

This valve is barely cracked. Temperature will affect it at such close settings.

Starting pressure Saturday when beam fell off: 4e-8 Torr.

Pressure today with strong beam: 6e-8 Torr.

Pressure during Saturday setup where beam began to quench: 8e-8 Torr.

Conclusion: Correct operating pressure range for Supernanogan source is tight. We removed the MWS head, anticipating this to be the case. It's so even when the slight extra pressure is entirely due to the source gas.

As noted, we handed over the beam to our users yesterday by noon. Setup to DRAGON is continuing. The report this morning that beam is great. Good.

Beam was quiet overnight. Keerthi touched up the tune this morning, and it is quieter yet and a little more of it too.

Later... Handover to Sophia occurred as scheduled. Save: 091105_1203.snapiosdragon

An IOSIOC reboot occurred sometime over the lunch hour. The usual suspects went down, plus the field stability correction power supply went to its lower limit. Reset this 'n' that and we're back. ~2e˜µA at FC6.

Later... Latest save: 091105_1449.snapiosdragon

Beam stayed up overnight nicely. Development today. RF scans in progress now.

Later... scanning done for the moment. Controls is looking at a PLC issue that has been on the books for a while. I have given the okay to turn on and off MCIS:IG1 at will.

Later aroun noon... We opened the cage and adjusted up the 17O2 flow slightly. Source is up and looking good. Optimize later.

Done for now. Some mass scans done. 1.2eµA at FC6.

Later... an initial emittance scan. Slits at 2.5mm.

Later... some tuning and another emittance scan. Slits at 5mm. 1.4eµA at FC6. EL deliberately low to balance skimmer spills. Save: 091104_1800.snapiosfc6

Let it cook for the night.

We completed 33S operation last night, and roughed in a setup for 17O. We had 17O3+ on FC6 overnight; chart attached. It grew nicely. Keerthi is working with the beam now.

As noted earlier, we have opened the OLIS cage and set up the source gases for 17O operation. It will take a while for the SO2 to pump away and for the 17O2 to equalize within the source body. Meanwhile, we have restarted the source with a preliminary 17O3+ beam on FC6. Without a doubt this will be unstable for a time, and the source may blink out also.

Beam came up nicely on  Friday, and stayed up quuietly over the weekend. Note the absence of periodic spikes in the separator field readback since the last IOC reboots.

Later... I have asked ICR to make us a nice emittance scan. (They are running beam at 8pi presently as well.)

Later... Well, nothing's ever simple. Eventually the emittance scan controls froze up, requiring an IOSIOC reboot. That of course zeroed optics. ICR recovered the beam. Attached is the final emittance scan. Slits are in at the 5mm positions.

That's it for 33S5+ development. I will switch off the source momentarily, and shut down the source gas supply.

Controls finished with IOSIOC work yesterday. ICR had restored most optics. I restarted the source last evening. As you can see below, the beam grew nicely overnight. Sometime today I will ask ICR to reboot IOSIOC and see if everything stays up now.

One more thing. The chart shows the last couple of days' running. Prior to beam-off for IOSIOC, we observed periodic spikes of about 45m each in the separator field readback. Now the readback is clean. We did not make any changes on our side. Only the IOSIOC work was done. Interesting, no?

Noon: ICR is rebooting IOSIOC right now. So far, normal whiteout plus MCIS optics is also white. CANbus page is also white, as I expect it to be.

12:15: IOSIOC is up, but 'most everything else is down. That's disappointing.

Later: Controls is looking into it. They have the optics for the afternoon. I will restart the source at the end of the day today.

Much later: Beam is on. ~3enA

Yesterday there was an IOSIOC reboot for a purpose. It was an opportunity to demonstrate to Controls that IOSIOC reboots materially affect the IOS section. Controls responded to an ICR fault report on it, and have not reported back to ICR so far. The source was off overnight and remains off now. I have informed ICR that if nothing happens this morning, I will restart the source after lunch.

Later... Jane reports that there was a problem, and it's been solved. We have to request that MCIS PVs get restored after a reboot. Done. Restart stuff. Much of IOS was already on.