 Wed Jul 8 17:47:26 2009, Damien Gallop, Routine, General, 18O4+ emittance scans 
|
First up is a check scan of 18O4+. There is a definite vertical offset compared to earlier today. Otherwise, it correlates well enough. The same beam
taken with a greater vertical offset follows, together with the modified emittance panel. |
|
Wed Jul 8 16:12:51 2009, Damien Gallop, Routine, General, Mass scan in progress
|
A mass scan from A/q of zero to 25 is in progress. Data file (large): masscorr_mcis_090708.txt.
The source is optimized for 18O4+. Fishing for 18On+ states and their emittance scans to follow. Attached is one screenshot of the Gabe's Calibrate interface.
I ran it several times with different peak selections from the same data. I entered into the EPICS mass correlation program a best average of the calibrations |
|
Wed Jul 8 11:52:54 2009, Damien Gallop, Routine, General, Supernanogan development run plan for the remainder of this set
|
* 18On+ emittance scans at present ion source settings: complete today.
* 18On+ frequency measurements: Thursday.
* 17O source gas: open end of Thursday. |
|
Wed Jul 8 10:57:46 2009, Damien Gallop, Routine, General, 18O4+ emittance scans 10x
|
Tune saved as 090708_1200.snapmcisfc6. I settled on the 15.486GHz
optimal frequency, and tweaked that for effect. Then I ran a few emittance scans. During that process, I noticed that the beam intensity had stepped down
and up a few times. So I tweaked the frequency again to return 30enA on FC6. Note that in this process the beam shifted slightly in the horizontal plane. |
|
Wed Jul 8 09:34:58 2009, Damien Gallop, Routine, General, 18O4+ frequency optimization
|
Starting frequency: 15.7864GHz => 870pA on FC6 Step size: 1MHz. Selected peaks shown. There were many smaller resonances in-between also.
Strong peaks at:
15.8594GHz => 7.5nA |
|
Wed Jul 8 09:22:07 2009, Damien Gallop, Routine, General, 18O4+ beam growth overnight
|
After accessing the OLIS cage and opening the 18O source gas valve, I restarted the Supernanogan source last evening around 18:00 ( just to the left
of -15h on the attached stripchart), with the line set up for 18O4+. The beam on FC6 grew nicely overnight. MCIS pressure moved from ~6.5e-8 to ~7.1e-8
Torr since the 18O source gas bottle was opened last evening. |
|
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 |
|
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 |
|
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 |
|
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. |
|
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+. |
|
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. |
|
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. |
|
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 |
|
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). |
|
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 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 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 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. |
|
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! |