Today Supernanogan vacuum found to be down in the morning. Restarted easily.

Changed OLIS A/Q to 5 (20Ne+4) to satisfy the CSB and ISAC development changes. 8nA is sitting at the FC6

Over the weekend, Keerthi had set up 22Ne4+ to FC6 for the purpose of developing a tune matched with a similar tune from the CSB. However, yesterday it turned out that the CSB could not generate a 22Ne beam sufficiently bright for tuning. So the project was scrapped. Keerthi then changed the source for 20Ne4+ operation, and handed it over to Marco yesterday. I think that is going well. Here is a trar plot of overnight beam.

Supernanogan is ready with 22Ne+4 for upcoming CSB run. EL, HV and RF are on. The anlyzing magnet and the other optics are set for A/Q=5.5.

A 2nA of 22Ne+4 is sitting at the FC6. If require more current, increase the RF up to 25W or change the frequency to 13.256GHz.

A  1e-5 atm.cc/sec of 17O leak and a 1e-6 atm.cc/sec of neon leak are connected to the source through center tube of the RF transfer antenna.

Ne valve is open for upcoming CSB test.  17O valve is closed. All optics are set to A/Q=5.5.  RF, EL and HV are off for the weekend since no ISAC ops at night.

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:

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, IOS was not opened at this time.

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.

33S particle rate: 1e9Hz.

A/q = 6.6

Bias used = 13.881kV.

090916_1206ILTEMIT.txt

Graphics with "color" in the filename will look in print the same as "greyscale" files.

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.)

090916_1222ILTEMIT.txt  Changed the MCIS steering to center the beam in the EL. 17O+3 ~5uA, 50x100

090916_1215ILTEMIT.txt    EL increased, ~4.5uA, emittance increases, 50x100   17O+3

090916_1156ILTEMIT.txt      17O+3  good settings 50x100 ,   333nA Scale, ~4uA

090916_1206ILTEMIT.txt      17O+3  good settings 100x200 ,   333nA Scale, ~4uA

0.4nA of 17O+8 is sitting on FC6. Development will continue tomorrow.

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)

Here are pix of the same scan: original, then greyscale, then cropped, using The GIMP. Not bad.

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.

Scan #3: Widen emittance parameters in control panel.

Scan #4: Tweak MCIS CBs for FC0.

Scan #5: Optimize EL on FC6.

Scan #6: Lower EL by 10%.

Scan #7: Lower EL by another 20%.

Scan #8: Lower EL to 50% of full scale.

Scan #9: Tune for minimum spill with reasonable quantity on FC6. Save: 090915_1704.snapiosfc6

Final emittance rig control panel.

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.

First emittance scan of 16O3+ beam pix. First save: 090915_1053.snapiosfc6.

Also, here is a stripchart of the separator field and FC6 before and after the energy change. The field is nice and stable, and FC6 is consistent.

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 total beam from the source.