 Wed Jul 8 09:22:07 2009, Damien Gallop, Routine, General, 18O4+ beam growth overnight 
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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. |
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Wed Jul 8 09:34:58 2009, Damien Gallop, Routine, General, 18O4+ frequency optimization
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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 |
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Wed Jul 8 10:57:46 2009, Damien Gallop, Routine, General, 18O4+ emittance scans 10x
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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. |
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Wed Jul 8 11:52:54 2009, Damien Gallop, Routine, General, Supernanogan development run plan for the remainder of this set
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* 18On+ emittance scans at present ion source settings: complete today.
* 18On+ frequency measurements: Thursday.
* 17O source gas: open end of Thursday. |
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Wed Jul 8 16:12:51 2009, Damien Gallop, Routine, General, Mass scan in progress
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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 |
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Wed Jul 8 17:47:26 2009, Damien Gallop, Routine, General, 18O4+ emittance scans
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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. |
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Wed Jul 8 17:58:02 2009, Damien Gallop, Routine, General, 18O1+ emittance scan
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| Here we go. A/q = 18 FC6 = 141.0nA MB = 2078G @ 130.2A |
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Wed Jul 8 18:12:25 2009, Damien Gallop, Routine, General, 18O2+ emittance scan
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| A/q = 9 FC6 = 50.0nA MB = 1470.8G @ 90.8A |
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Wed Jul 8 18:20:43 2009, Damien Gallop, Routine, General, 18O3+ emittance scan
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| A/q = 6 FC6 = 49.5nA MB = 1201.4G @ 73.1A |
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Wed Jul 8 18:38:21 2009, Damien Gallop, Routine, General, 18O4+ emittance scan
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| A/q = 4.5 FC6 = 29.5nA MB = 1041.8G @ 62.4A |
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Wed Jul 8 18:47:43 2009, Damien Gallop, Routine, General, 18O5+ emittance scan
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| A/q = 3.6 FC6 = 12.5nA MB = 931.8G @ 55.3A |
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Wed Jul 8 18:57:09 2009, Damien Gallop, Routine, General, 18O6+ emittance scan
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| A/q = 3 FC6 = 5.5nA MB = 851.5G @ 50.1A |
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Wed Jul 8 19:07:15 2009, Damien Gallop, Routine, General, 18O7+ emittance scan
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A/q = 2.57 FC6 = 0.25nA MB = 790.0G @ 46.2A
Not enough intensity for an emittance scan. |
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Wed Jul 8 19:13:15 2009, Damien Gallop, Routine, General, 18O8+ emittance scan
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A/q = 2.25 FC6 at reverse bias MB = 736.9G @ 42.9A
Not enough intensity for an emittance scan. Possibly on the edge of A/q=2.3 (23Na10+?). |
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Wed Jul 8 19:51:33 2009, Damien Gallop, Routine, General, 18On+ summary for the day
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The 18O source gas bottle is online. The ion source was optimized for 18O4+ and kept the same throughout. Emittance scans of each charge state of 18O
were attempted. Visible scans were found for all states up to 6+. At least one more set of scans is desireable. Present beam is 18O4+. Next up: RF frequency
survey with 18On+. |
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Thu Jul 9 16:07:56 2009, Damien Gallop, Routine, General, 18O8+ frequency scans 6x
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Keerthi did some 18On+ frequency scans this morning. He observed 18O8+! I am attempting to repeat it myself now. Reverse bias on FC6.
Peaks at:
13.0277GHz => 1epA (unstable) |
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Fri Jul 10 09:55:25 2009, Damien Gallop, Routine, General, 18O8+ beam overnight
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Here is a striptool of 18O8+ beam (magenta trace) last evening from about 18:00 to 22:30 when there was a large power bump coincident with a plane
crash in Richmond last night. Before the trip, beam current was about 20epA on FC6 (normal bias). |
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Fri Jul 10 11:46:55 2009, Damien Gallop, Routine, General, 18On+ frequency scans & resonances
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The Supernanogan was restarted this morning, after last night's power bump. 18O4+ on FC6, cooking for about an hour. Looks very good. Keerthi is doing
frequency scans today to find best resonances. Time permitting, he will do this over a range of 18O charge states. At some point over the weekend (my guess
is tomorrow evening), he will open the 17O source gas bottle to the system. |
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Fri Jul 10 11:47:07 2009, Damien Gallop, Routine, General, 18On+ frequency scans & resonances
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The Supernanogan was restarted this morning, after last night's power bump. 18O4+ on FC6, cooking for about an hour. Looks very good. Keerthi is doing
frequency scans today to find best resonances. Time permitting, he will do this over a range of 18O charge states. He is also developing a dual-mode (MCIS/MWS)
IOS tune. At some point over the weekend (my guess is tomorrow evening), he will open the 17O source gas bottle to the system. |
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Mon Jul 13 09:49:52 2009, Damien Gallop, , , 18O4+ tuning to TIGRESS today
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As per our agreed deal last week, today is reserved for Supernanogan tuning to TIGRESS. Development will resume tomorrow.
There was a power bump overnight that knocked out many systems, including OLIS. The ISAC elog mentions something about it here.
It seems that Keerthi restarted the source. (Note to self: Write an ION with brief restart instructions for the Supernanogan.) 18O4+ beam was left on FC6, |