ID |
Date |
Author |
Type |
Category |
Subject |
51
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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 |
* 18On+ emittance scans at present ion source settings: complete today.
* 18On+ frequency measurements: Thursday.
* 17O source gas: open end of Thursday.
* 17On+ frequency survey: Friday.
* 17On+ emittance scans at idealized source settings: Monday.
* Development completion: Tuesday.
* 18O4+ setup for beam schedule: Wednesday. |
52
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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 for the two constants. |
Attachment 1: grab.rh2790.png
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Attachment 2: Picture_16.png
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Attachment 3: Picture_17.png
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53
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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. |
Attachment 1: grab.Jj2874.png
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Attachment 2: grab.fz2878.png
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Attachment 3: grab.ND2931.png
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Attachment 4: grab.pH2935.png
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Attachment 5: grab.oY2939.png
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54
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Wed Jul 8 17:58:02 2009 |
Damien Gallop | Routine | General | 18O1+ emittance scan |
Here we go. A/q = 18 FC6 = 141.0nA MB = 2078G @ 130.2A |
Attachment 1: grab.QR2996.png
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Attachment 2: grab.dm3000.png
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55
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Wed Jul 8 18:12:25 2009 |
Damien Gallop | Routine | General | 18O2+ emittance scan |
A/q = 9 FC6 = 50.0nA MB = 1470.8G @ 90.8A |
Attachment 1: grab.LL3034.png
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Attachment 2: grab.Yj3038.png
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56
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Wed Jul 8 18:20:43 2009 |
Damien Gallop | Routine | General | 18O3+ emittance scan |
A/q = 6 FC6 = 49.5nA MB = 1201.4G @ 73.1A |
Attachment 1: grab.Pc3095.png
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Attachment 2: grab.Oi3099.png
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57
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Wed Jul 8 18:38:21 2009 |
Damien Gallop | Routine | General | 18O4+ emittance scan |
A/q = 4.5 FC6 = 29.5nA MB = 1041.8G @ 62.4A |
Attachment 1: grab.Cb3157.png
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Attachment 2: grab.wO3161.png
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58
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Wed Jul 8 18:47:43 2009 |
Damien Gallop | Routine | General | 18O5+ emittance scan |
A/q = 3.6 FC6 = 12.5nA MB = 931.8G @ 55.3A |
Attachment 1: grab.IW3188.png
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Attachment 2: grab.kW3192.png
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59
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Wed Jul 8 18:57:09 2009 |
Damien Gallop | Routine | General | 18O6+ emittance scan |
A/q = 3 FC6 = 5.5nA MB = 851.5G @ 50.1A |
Attachment 1: grab.cb3228.png
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Attachment 2: grab.un3232.png
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60
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Wed Jul 8 19:07:15 2009 |
Damien Gallop | Routine | General | 18O7+ emittance scan |
A/q = 2.57 FC6 = 0.25nA MB = 790.0G @ 46.2A
Not enough intensity for an emittance scan. |
Attachment 1: grab.ca3306.png
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61
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Wed Jul 8 19:13:15 2009 |
Damien Gallop | Routine | General | 18O8+ emittance scan |
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+?). |
Attachment 1: grab.Ah3293.png
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Attachment 2: grab.ed3302.png
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Attachment 3: grab.Nc3298.png
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62
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Wed Jul 8 19:51:33 2009 |
Damien Gallop | Routine | General | 18On+ summary for the day |
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+. |
Attachment 1: grab.TF3397.png
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Attachment 2: grab.fu3402.png
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Attachment 3: grab.Tk3406.png
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63
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Thu Jul 9 16:07:56 2009 |
Damien Gallop | Routine | General | 18O8+ frequency scans |
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)
13.1023GHz => 1epA (unstable)
13.1695GHz => 10epA (unstable)
13.1672GHz => 20epA (unstable) stripchart attached
13.006GHz => .7epA stripchart at 17:24 attached
First, optimize current versus frequency and amplitude. Unfortunately at 5dB the beam blinked out. Go fishing, then find it again. Attached is stripchart at 17:30, where I was optimizing, then switched bias to Normal, then watched beam blink out. Then stripchart at 17:49 shows beam back again, reverse bias on the left and normal bias on the right: ~10epA. RF settings also attached. Minutes later, beam is still on. FTR, the original RF is appended at the end.
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Attachment 1: grab.hM6579.png
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Attachment 2: grab.OC6749.png
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Attachment 3: grab.pj6791.png
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Attachment 4: grab.Zw6832.png
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Attachment 5: grab.ko6836.png
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Attachment 6: grab.xu6426.png
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64
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Fri Jul 10 09:55:25 2009 |
Damien Gallop | Routine | General | 18O8+ beam overnight |
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). |
Attachment 1: grab.N10241.png
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65
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Fri Jul 10 11:46:55 2009 |
Damien Gallop | Routine | General | 18On+ frequency scans & resonances |
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. |
Attachment 1: Picture_18.png
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66
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Fri Jul 10 11:47:07 2009 |
Damien Gallop | Routine | General | 18On+ frequency scans & resonances |
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. |
Attachment 1: Picture_18.png
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133
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Fri Sep 11 23:42:45 2009 |
Keerthi | Other | General | MCIS turbo pump |
MCIS TP1 is not running well. Needs investigation as soon as S1219 is completed.
Later... TP1 failed completely, and we are running without it. Starting late Saturday night, DRAGON began to observe a certain instability. We correlated it to MCIS:COL0, which skims total current continuously. It is pretty evident that the source is now toggling between two adjacent plasma modes, due to the somewhat higher vacuum at MCIS. Vacuum was something in the 7-8e-8 Torr range before, but has settled out at some 1.25e-7 Torr now. General consensus is to continue running like this, as it is a minor effect, as you can see below (blue trace). DMG |
Attachment 1: mcis_multi-state.png
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138
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Tue Sep 15 19:46:21 2009 |
Keerthi | Routine | General | Supernanogan emittance scans |
090915_1915ILTEMIT.txt = 17O +3, 4.4uA new tune, scanner offset +10V, scanner scale 100nA , 100x50 matrix
090915_1929ILTEMIT.txt = same as above with 200x100 matrix
090915_1949ILTEMIT.txt = after tune tweaking (not optimal; for reference only) |
Attachment 1: grab.w23925.png
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Attachment 2: grab.L23930.png
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Attachment 3: grab.J23942.png
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Attachment 4: grab.K23948.png
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Attachment 5: grab.N23902.png
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Attachment 6: grab.f23908.png
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Attachment 7: grab.C23914.png
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Attachment 8: grab.v23919.png
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Attachment 9: grab.y24035.png
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140
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Wed Sep 16 12:12:04 2009 |
Keerthi | Routine | General | 17O+3 emittance sacns |
090916_1156ILTEMIT.txt 17O+3 good settings 50x100 , 333nA Scale, ~4uA
090916_1206ILTEMIT.txt 17O+3 good settings 100x200 , 333nA Scale, ~4uA |
142
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Wed Sep 16 12:26:51 2009 |
Keerthi | Routine | General | 17O+3 emittance with changed steering |
090916_1222ILTEMIT.txt Changed the MCIS steering to center the beam in the EL. 17O+3 ~5uA, 50x100 |