 Mon Jun 22 20:28:37 2009, Damien Gallop, Routine, General, Preparations for 16O2+ delivery 6x
|
In anticipation of 16O2+ delivery mid-week, we checked 16O2+ production from the Supernanogan source. No problem. We did have to use the tightest slit
settings to achieve a low enough current for the user. Here are emittance scans, normal and with our test booster amplifier inline respectively. Subsequently
we set up the line to match into the RFQ. Bias is at 16.32KV. Then we returned the mass selection to 16O7+ for the night. A final emittance scan of 16O7+ |
|
Tue Jun 23 10:33:43 2009, Damien Gallop, Routine, General, Effects of RF on charge state
|
Today is the last day of this set of Supernanogan Development. The source ran at 16KV overnight, in anticipation of 16O2+ delivery later today. I expected
more bias sparking, but it appears that it sparked off only once. So I will condition at a higher bias later today. Meanwhile, the operators reported touching
up the tune with the magnet and the RF. Perhaps we are seeing some temperature effect on the source, so I will be looking at effects of RF on 16O7+ for |
|
Tue Jun 23 15:02:38 2009, Damien Gallop, Routine, General, 16O2+ on FC6
|
We now have about 80nA of 16O2+, using the same source parameters as before. Keep a watch for a while, then tune the source to match user's needs, somewhere
in the 10nA range.
Here is a stripchart of the 16O2+ beam for the last half-hour or so., and also the stripchart of it juxtaposed with 16O7+ earlier. Also a first |
|
Tue Jun 23 16:48:00 2009, Damien Gallop, Routine, General, 16O2+ on FC6 after source tuning
|
After a first round of source and line tuning for good current with minimum RF power, we have about 8nA of 16O2+ on FC6. Here is an emittance scan of
that. Present RF settings are 15.438GHz and -1.0dB with less than 1W of RF power. Bias is 16.32KV. Let's do some bias conditioning for a bit. |
|
Tue Jun 23 18:04:30 2009, Damien Gallop, Routine, General, MCIS HV conditioning to 20KV
|
Supernanogan bias for this run is 16.32KV. After we were finished with source tuning, etc., we conditioned up to 20KV. Then beam was returned and 16O2+
tuned saved as 090623_1730.snapmcisfc6. Next step: Prepare MWS for dual operation. Source open now for source gas installation. Then Keerthi will
develop a daul-mode tune, where the B1A bender only need be switched on or off to run either the MCIS or MWS source. |
|
Wed Jun 24 10:27:23 2009, Damien Gallop, Routine, General, 16O2+ tune ready for Sophia and Marco
|
See ISAC elog entry today. Keerthi
developed a dual-mode tune last night, so that we can run the MWS at will if so desired. Save file: 090624_0930.snapmcisfc6.
Emittance scans done. Overnight FC6 also attached. Sophia took the beam at 10:00. |
|
Mon Jun 29 10:35:35 2009, Damien Gallop, Routine, General, 16O2+ pilot beam to TACTIC in progress
|
We handed over a 16O2+ beam on Wednesday morning to Sophia for TACTIC setup. On our side, everything went well. TACTIC switched to RIB on Saturday night.
See ISAC elog entry. We remain on standby
for pilot beam. Schedule switched to development tomorrow morning. Attached is a stripchart of our beam for the last several hours. As good as it gets! |
|
Tue Jun 30 09:33:00 2009, Damien Gallop, Routine, General, Supernanogan Development begins today for two weeks
|
Supernanogan development starts today. The TACTIC run, which ended around 08:30 today, appears to have been a success. TACTIC used our beam for setup
and pilot, then took 8Li from downstairs. Marco is doing some EOB checks now. We will begin at 10:00. First part of our run plan will be to compare the
present 16O2+ beam with how it looked when we started, and identify what might have changed. |
|
Tue Jun 30 10:30:17 2009, Damien Gallop, Routine, General, Initial development setup
|
Setup teething pains... The Start button on the emittance panel worked this time. But ICR called, requesting a few minutes more for Marco. No problem.
When I went to restart the scan, the button no longer worked. Restarting X11 made no difference. However, there is a significant update available for X11,
so I am installing it now. I perceive that it works, yes, significantly faster than its predecessor. Good, all good. |
|
Tue Jun 30 10:56:26 2009, Damien Gallop, Routine, General, 16O2+ emittance scans 6x
|
The first emittance scan sort of got interrupted; it auto-restarted just before the previous scan had finished. I thought the resulting plot was somewhat
interesting. The emittance isn't half-bad either. A better scan follows. TACTIC took beam again for a while this afternoon to shake down a timing discrepancy.
We got it back around 4pm. One more emittance scan for good measure. |
|
Tue Jun 30 17:16:25 2009, Damien Gallop, Routine, General, 16O2+ emittance scans with slits open 6x
|
| First, with upstream slits opened, then with both open. Original slit setting was 1mm. Finally, restore slits to 1mm and see if it reproduces. It does. |
|
Tue Jun 30 17:39:13 2009, Damien Gallop, Routine, General, Compare 16O2+ beam from start of run to today 6x
|
There seemed to be some small change to the beam over the week of TACTIC running. I would like to poke around a bit. The emittance plots suggest some
vertical movement at least. The two plots are the before (emittance)
and after (emittance). |
|
Thu Jul 2 11:58:18 2009, Damien Gallop, Routine, General, Supernanogan development in progress
|
Happy Canada Day!
I noticed a long-term trend in beam intensity. I have every reason to believe that the source itself is rock-solid. I think it is temperature variation
affecting the Philtek power suply on the separator magnet. What bothers me is that the stability program appears to not be compensating for this. I am |
|
Thu Jul 2 16:55:04 2009, Damien Gallop, Routine, General, RF frequency scans versus each charge state of 16O 7x
|
Let's take a look at varying frequency versus beam current for 16O2+. Starting RF values shown below. FC6 = 1.09enA.
What I did: Pan RF frequency between about 12.5GHz and 14GHz. Plasma seemed to extinguish at a frequency under 13GHz.
What I found: Two peaks on the low side, right around 13GHz. |
|
Fri Jul 3 10:03:11 2009, Damien Gallop, Routine, General, Overnight beam stability on FC3
|
| Here are some pics and data from total MCIS beam on FC3 overnight. A bit inconclusive, but there may be a temperature correlation. |
|
Fri Jul 3 10:29:15 2009, Damien Gallop, Routine, General, RF frequency scans versus each charge state of 16O cont'd.
|
16O2+ beam on FC6 = 10nA as before. Move to 16O3+ A/q = 5.33...
A frequency scan between 13 & 14GHz. I panned closer around two peaks at 13.11 and 13.12GHz. Best frequency so far is 13.1321GHz, which provides
a reasonably stable 150pA of 16O3+. |
|
Mon Jul 6 10:57:08 2009, Damien Gallop, Routine, General, Beam stability versus temperature over weekend
|
We had 16O3+ on FC6 on Friday. An IOSIOC reboot occurred mid-afternoon Friday unfortunately. Operators restored beam at about 06:00 on Saturday. Beam
came back fine. I requested FC3 in at 18:00 Saturday to get some temperature correlation with total beam. Maybe there is a correlation, but a longer stretch
is needed. Something stopped at 18:00 on Sunday. Keerthi told me this morning that he found steerers off, and switching them on restored beam instantly. |
|
Mon Jul 6 17:34:24 2009, Damien Gallop, Routine, General, 18O background studies 6x
|
Well... my browser blew away just before I submitted version one of this entry. Let's try again.
Keerthi changed the tune this morning to 10kV on the MCIS bias in order to allow the full throw of the Enzel lens power supply. (Remember, for
the moment the panel displays twice what the physical power supply is actually delivering, because it is a 10kV supply, whereas the control system expects |
|
Tue Jul 7 15:43:19 2009, Damien Gallop, Routine, General, ISIS emittance rig tests this morning
|
Keerthi and I were front and centre doing ISIS emittance rig testing this morning. He ran it, and I tried to find ways to run the data in Matlab afterwards.
Main limitation up there at the ISIS Console is lack of any ssh-enabled terminals. Keerthi's wireless laptop is okay, but this stuff pushes the poor little
thing to the edge. Plus, there were some X display issues on it. He has Matlab installed locally, but it takes a bit of a rocket scientist to run it, and |
|
Tue Jul 7 17:47:14 2009, Damien Gallop, Routine, General, 18On+ beam & emittance
|
As noted earlier, we have 17O and 18O source gas attached to the Supernanogan source chamber. Both are valved off presently. The source has been running
for a while. I set it to 18O4+ on background, which gives about 125epA on FC6. Now let's stop the source, open the bottle and try the same again.
I opened the 18O valve just around 18:00. Beam is on now, around 150pA. That's a good sign. It's growing too. Even better. The MCIS tank pressure |