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.

The previous 18O4+/8+ run to TUDA-II finished midday yesterday. OLIS was prepared for 17O delivery from the Supernanogan source. Leak checking was done last night. The big offender was a failing metal seal on IOS:TP7. The pump will have to be replaced. Meanwhile the pressure is sufficient for 20nA of 17O3+ with 2.5mm (middle selection) apertures inserted. Present agreement is to leave TP7 as-is for this run.

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.

I alsmost want to write, see yesterday's entry! Source ran quietly with no interruptions. FTR, the separator stability program is also percolating along nicely. It was taking hits from nearby EMI until I added a ferrite split core to its USB cable at the computer end.

The Supernanogan was on overnight quietly. FC6 went in this morning. (Didn't check if fingers were involved.) I  now notice a strange pulsing in our Stripchart. See what you think. Note: field and A/q max scales are orders of magnitude higher than real life.

Later...At around 14:00 I added ferrite cores to the field probe cable at the CANbus interface box. That clipped the high side of the pulses completely. If I play very carefully with the field range, I can get small artifact-looking pulses to appear since I installed them (see 17:16 chart). In the meantime, I found that, contrary to appearances, the field stability program was not really regulating. A remote reboot of the server cured it.

Beam stayed on quietly overnight, as did the separator stability program. Periodic pulsing continues to occur. No explanation has been proffered so far. Adding ferrite cores appeared to clamp the high spikes, but high spikes reappeared around midnight. There does not appear to be any real effect on the beam or separator.

Beam was quiet overnight. I noticed a slow drift that seemed to follow the source pressure. My best guess is that our source gas "regulator" is a little coarse at these flows. Save: 091028_0935.snapiosfc6

The source stayed up quietly overnight with about 4enA on FC6. Once in a while a little burp occurs, visible as small beam and vacuum spikes. I have tweaked the RF frequency up a little for better centre of range.

I had optimized the RF yesterday, but the source went into a dual-mode toggling regime. It is hairline to find a nice point. I also found that it responds better if frequency is approached from high to low.

Later... After some tweaks earlier, beam is looking pretty good, a solid 3enA at FC6.

BTW, we are still running with the same SO2 gas settings as before, i.e. the calibrated leak valve just barely cracked open. Under the circumstances, it's a sweet spot for us.

Later... Another blip on the field probe at 16:15. Coincidentally the beam took a little hit. Here are the Stripcharts (tight zoom and normal zoom).

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

On Friday we left 33S5+ on FC6. The separator magnet power supply tripped at some point for unknown reason. The operators turned it on again overnight. Keerthi tweaked and tuned early this morning and just recently. Beam is back to FC6, but displayed A/q is off, though the actual beam is correct.

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.

Switch on source for stats. Source lit up perfectly. Slight adjustment on RF frequency.

High resolution zero to 25. Save file: masscorr_mcis_090817-highres.txt

Ack! Elog server went down at ~17:00!!!

18O4+ emittance scan at 22.44kV and slits open: 090817_1707ILTEMIT.txt

Note that in preparation for this scan I steered beam in X then in Y onto FC3 and FC6 respectively, looking for all beam through each slit. There was flat-topping evident in both directions for both cups. I would like to repeat the study for well-defined X beam through each slit by scanning with the 1mm slit and noting the drop-off at the tails. For what they're worth, I am appending the stripcharts for each cup. Data files are here:

mcis_strip_steering_fc3_090817.dat

mcis_strip_steering_fc6_090817.dat

I have begun a mass scan from 0 to 25. It will be a while. Data file: masscorr_mcis__0-25_090714.txt. 25nA of 18O4+ restored to FC6.

I found these files about the MCIS in Geoff folders in M:\ISIS\Geoff-110715\OLIS\SuperNanogan

The source is on. There is background beam on FC6 presently, less than yesterday. That's probably a good thing. Let it cook for a bit, then check the tune. Note: EL is off, as yesterday.

MCIS was running with background only. Prepare to open SO2 source gas...

MCIS:IG1 = 5.4e-8 Torr

TP1 = 13W

TP2 = 10W

Status: Leak valve closed, line valve open.

Bump leak valve carefully... but not carefully enough. Pressure bump, and back to 6e-8. I am using line valve as a needle valve. Pretty touchy, but it works.

 IOSIOC whiteouts and other funny things... I will ask assistance from ICR.

MCIS:IG1:= 7.4e-8 Torr with line valve barely cracked.

Well, it turns out that ICR is having trouble with other ion gauges in apparently unrelated sections. Interesting. Meanwhile, MCIS:IG1 trippd off and EPICS will not allow a reset. MCISIOC looks white... restart it.

Later... Controls + ICR have rebooted PLC1IOC and PLC2IOC, and perhaps others. Anyway, stuff is working again. Beam is on to MCIS:FC1 and IOS:FC3.

Later... Still no beam visible on FC6. But IG1 has crept up to ~2e-7 Torr. Open cage and adjust down. It's just about the smallest increment I can make, but it's a big step down. Meanwhile, The readback for IOS:MB field went crazy for a moment. I have it on a Stripchart, below.

Later... Liftoff. We now have 200epA on FC6 at 13.10GHz. Let it sit for a bit. Other possible resonances at 13.17, 13.24, 13.27, 13.34GHz.

Source started. 33S5+ beam on FC6 using gas flow determined yesterday. At first blush, it appears we need a slightly higher flow. But for now we will spend some time optimizing with what we have. We may open and adjust the flow later.

Later... This flow is okay for now. It requires a *really* fine control, which we do not have at present. 3enA with 10W of power. One source spark about a half hour ago. Mainly it knocked off the separator PS. Spill characteristics are slightly different also.

We discussed whether or not to leave the Supernanogan in the OLIS Faraday cage, and decided no, because the up-coming runs will use the MWS at 42 and 52kV respectively, higher than the MCIS HV rating. Bonus: We have more working room in the cage. The cart is out and parked. Services are connected and up.

Run Plan:

• Remove MCIS cart.
• Set up for leak-checking MWS gas manifold.
• Pump manifold through IOS volume.
• Repair leaks as necessary.
• Pump.
• Start MWS with 21Ne beam.

 Beam to scheduled user at 08:30 Friday. TUDA-II safety commissioning is planned for Thursday. Sophia will need beam prior in order to set up into SEBT.