 Mon Aug 10 17:42:18 2009, Damien Gallop, , , MWS 25Mg emittance scan with original settings 6x
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Finally, here is the "original" beam. Can you tell the difference (side-by-side at bottom)? I can't.
Data file: 090810_1738.ILTEMIT.txt |
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Mon Aug 10 18:06:09 2009, Damien Gallop, , , MWS 25Mg reduce intensity with PE
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So... we have had this on-going problem with intense Mg beam coating our optics. Keerthi found a good recipe last week with PE on and a somewhat large
support gas flow. We have been running with several tens of nA since. Since yesterday's trip, I have been gradually lowering the PE from my initial value
of 100V to 30V presently with about 10nA on FC6. Beam looks like it will be very stable, and the EE will maintain indefinitely like this. The first test: |
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Mon Aug 10 18:29:32 2009, Damien Gallop, , , MWS source trip & restart
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Well, so it goes. As I was penning a note for OPS, the source tripped. It easily reignited with a little extra Ne. I left the flow slightly higher, from
1.1 to 1.2ccm and the PE at 41V. |
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Tue Aug 11 09:54:28 2009, Damien Gallop, , , MWS 25Mg operation overnight & MCIS cart installation
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As noted earlier, the MWS beam dropped out at some point after yesterday afternoon's playtime, due to insufficient PE. Plasma was lost. I restarted the
source remotely. The present combination of Ne flow SP = 1.2ccm and PE = 48V works well. Plasma will persist regardless of Mg presence or PE setting. That's
a good thing. Then using the PE we can control how the plasma ionizes the Mg material. Note the attached stripcharts. At the lower PE settings, the Mg |
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Fri Aug 14 13:53:34 2009, Damien Gallop, , , MWS 25Mg end of run data 10x
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Marco gave us the all-clear this morning to shut down the MWS. We are preparing to remove the MWS head from the Y-box and blank it off, in order to maximize
the vacuum around the Supernanogan. I have advised Marco of our intention to do this and that there is no going back. He is good with that. More in a bit.
Here is a stripchart of the 25Mg beam. The EE was off for the night. Turning it on restored beam immediately. It reached equilibrium after about |
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Mon Aug 17 13:58:35 2009, Damien Gallop, , , Supernanogan Development begins today for one week
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Supernanogan Development begins. It will be a marathon. Main goals are high-charge emittance scans and RF frequency scans. Tall order.
Meanwhile, the MWS came out as planned. Thank goodness for the quartz liner, which took most of the hit from the magnesium. IOS optics are another
story. We are running with an alternate tune for Q1/Q2/Q3, as noted elsewhere. The Supernanogan, already at vacuum, pumped down nicely, as did IOS and |
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Mon Aug 17 15:53:54 2009, Damien Gallop, , , MCIS mass scans & initial emittance scans 11x
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High resolution zero to 25. Save file: masscorr_mcis_090817-highres.txt
Ack! Elog server went down at ~17:00!!!
18O4+ emittance scan at 22.44kV and slits open: 090817_1707ILTEMIT.txt |
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Tue Aug 18 11:16:16 2009, Damien Gallop, , , MCIS "PV" PLC trip overnight
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Another in the on-going saga of MCIS:PV1 trips occurred again this morning. The operators recovered most of the vacuum devices except for the IM section
gate valves. We had an in-person discussion about them, the order in which they should be opened, and the existence of a hand valve in the IM roughing
line. An ION note is needed. |
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Tue Sep 8 15:14:45 2009, Damien Gallop, , , Back from vacation
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I'm back from vacation. Physically, anyway. Keerthi did comprehensive emittance scans during Supernanogan Development over the last couple of weeks.
He is very happy with the results so far. We are doing come post-analysis comparisons presently. Meanwhile, DRAGON is taking 16O3+. Some sideshows, including
power bumps this morning which knocked out MCIS and many other systems. The mag stab facility was offline while I was away. I restarted it around noon. |
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Tue Sep 15 09:54:22 2009, Damien Gallop, , , 16O3+ run to DRAGON ended on schedule at 08:00 8x
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The DRAGON run ended uneventfully. (That's a good thing.) I ran a few emittance scans on the beam as-is. It is clearly monoisotopic. The shape is a little
odd. Keerthi will comment on it in a while. Here are some pix. Below the emittance control panel are pix of the same beam at wider settings. Only the one
16O3+ peak is present. Finally, at the bottom is a pic of various parameters, the most important of which is COL0, which reflects the stability of the |
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Tue Sep 15 10:32:39 2009, Damien Gallop, , , MCIS Development 7x
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So. We are preparing for a few days of Supernanogan development. The present run plan is to obtain good emittance scans for higher charge states of 16O,
17O and 18. We may be limited by the loss of MCIS:TP1, but maybe not.
Set up on nom 18kV tune based on last recent save: 090831_1104.snapiosfc6. MCIS HV tickled up to prevent extracted beam surges. |
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Tue Sep 15 16:09:31 2009, Damien Gallop, , , MCIS Development 17O emittance scans 13x
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We noticed a double peak effect in the 16O3+ scan. I will set up the line for 17O3+ and see.
Scan #1: Double peak also visible.
Scan #2: Remove upstream slit altogether. Now profile is twice the size in the opposite direction of the double peak. |
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Tue Sep 15 16:56:03 2009, Damien Gallop, , , Test scans for publication
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| Here are pix of the same scan: original, then greyscale, then cropped, using The GIMP. Not bad. |
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Tue Sep 15 20:02:46 2009, Keerthi, , , 17O8+ on FC6 from MCIS
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| 0.4nA of 17O+8 is sitting on FC6. Development will continue tomorrow. |
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Wed Sep 16 12:20:10 2009, Keerthi, , , 17O+3 emittance with increased EL
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| 090916_1215ILTEMIT.txt EL increased, ~4.5uA, emittance increases, 50x100 17O+3 |
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Wed Sep 16 12:48:13 2009, Keerthi, , , 17O+5 double peaks
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090916_1242ILTEMIT.txt 17O+5 has two peaks.
090916_1355ILTEMIT.txt Repeat same measurement an hour later. (IOS bias was off in-between due to IOC/PLC reboots.) |
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Wed Sep 16 18:14:29 2009, Damien Gallop, , , Test scans for publication 2 19x
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090916_1206ILTEMIT.txt
Graphics with "color" in the filename will look in print the same as "greyscale" files. |
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Mon Sep 28 14:12:17 2009, Damien Gallop, , , 33S5+ from MCIS on Friday 25-Sep-2009
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A sustained 33S5+ beam was generated in the Supernanogan on Friday, September 25th. Attached is a trar plot.
Source gas: SO2 through either of two calibrated leaks: 10-4 and 10-5ccm.
FC6 = 1enA. |
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Mon Sep 28 14:16:47 2009, Damien Gallop, , , MCIS Cart down for TP1 Replacement
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We are taking the opportunity to replace TP1 today. Edi Dalla Valle is on it. Also, Diagnostics has a WP in the queue for looking at the attenuators,
so we have prepared IOS for venting.
Later... Cart was removed from cage for access. Pump was replaced successfully, and all volumes are under high vacuum now (17:00). In the end, |
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Wed Sep 30 15:30:04 2009, Damien Gallop, , , 33S6+ from MCIS for DRAGON setup
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Beam is stable enough to let Marco set up something to DRAGON. We are a couple of days early.
Also, we tested the attenuators, previously noted to be operating oddly:
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