 Wed Jul 15 10:27:18 2009, Damien Gallop, , , 18O4+ overnight and emittance check 
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Repeat emittance scan of present 18O4+ beam. It compares okay (somewhat broader emittance numbers) with yesterday's scan. Also attached is FC6
beam overnight. Nice. |
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Wed Jul 15 09:20:26 2009, Damien Gallop, , , Supernanogan development in progress
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Proposed run plan for this time:
Document TIGRESS tune.
18O4+ emittance scan.
Mass scan A/q = 0 to 25.
Repeat 18On+ emittance
scans at present RF frequency.
16On+ emittance scans at present frequency.
Plot 16On+ & 18On+ emittance on one graph.
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Tue Jul 14 15:19:51 2009, Damien Gallop, , , MCIS mass scan
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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. |
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Tue Jul 14 09:47:14 2009, Damien Gallop, , , 18O4+ tuning to TIGRESS this morning 7x
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We have a change of schedule. Due to circumstances, Sophia will continue tuning to TIGRESS this morning. Sgan Development will resume this afternoon.
Details: The beam path through the TIGRESS chamber is clear presently, and no detectors are mounted. It is the perfect time to send a nA pilot
beam to the end of the line. TIGRESS intends to install electronics starting at noon. Sophia expects to have tuning comfortably completed by then also. |
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Mon Jul 13 17:41:04 2009, Damien Gallop, , , Supernanogan development Monday morning
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As noted, Keerthi was called to restart the source after a power bump. He continued Supernanogan development through the night (can you imagine?!?).
He made some great progress. Here is a partial summary of his findings.
Actions taken: frequency scans across the entire range from 12-16GHz for each charge state of 18O. |
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Mon Jul 13 17:19:29 2009, Damien Gallop, , , MCIS vacuum trip at ~15:30
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An MCIS vacuum trip occurred somewhere around 15:30. Sophia observed a drop-off in beam. The cause looks like the PLC-related business that we have experienced
many times before. This fault has not manifested itself for quite a while, since Controls firewalled the MCIS portion of the network on March 30th. |
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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, |
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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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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 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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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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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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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 19:07:15 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 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 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 18:38:21 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 18:20:43 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 18:12:25 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 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 |