DRAGON continues to take MWS beam.

Later... 14:00 EOB. Prepare for Mini-Shutdown.

We have a request for changing over the source to 4He1+ operation from the MWS.

Later... OLIS opened. Canister purged with N2 and pumped via IOS, then valved off and disconnected. ICR has restored a recent 4He1+ tune.

Keerthi came in on Saturday morning and set up the Supernanogan source for 4He delivery. It looks like it went well. The original intent was to use the MWS for this, but sputtering got in the way. He also came in yesterday to tweak the recipe to minimize 16O4+ and 12C3+ (A/q=4) contribution to the beam. The run finished last night.

The 58Ni delivery from MWS to TITAN ended last evening. Beam was unused from about 18:30, and source switchover began at about 22:00. A 4He1+ beam from MCIS was established by 03:00 this morning. Around 35pA is available on FC6 presently. Note that at A/q=4, there are likely contributions from 12C+3 and 16O+4.

Delivery continued through the weekend. Some 300nA on FC6. The run ended at around 09:00. Source switchover is in progress now.

Beam development for forthcoming 36Ar run is in progress. Initial yield numbers have been determined. Source is running with Ar plasma presently, and tests will be repeated after source has conditioned for a while. The goal is to determine yield numbers of 40Ar and scale these to beam to be produced with source gas of enriched 36Ar. FYI:

Naturally occuring isotopes of argon:

Ar-36 ( 0.3365% )
Ar-38 ( 0.0632% )
Ar-40 ( 99.6003% )

40Ar source gas, ergo 40Ar+x beams. 40Ar+6 earlier, and 40Ar+7 presently.

Development with Supernanogan source continues. Present beam is 40Ar+7, about 70enA.

OLIS off Wednesday morning for source changeover from 16O3+ to 35Cl2+. We have elected to use the MWS for this run. Supernanogan is removed from OLIS and parked at its service dock. Lots of leakchecking done on both sources. Both sources are under high vacuum presently and improving. MWS will be ready to start in the morning.

First beam appearing on FC6 presently, after the source pumped overnight. Source gas valving set up earlier this morning.

Later... We have a whopping 5nA of 35Cl1+. We expect orders of magnitude more. Mass scans and investigation in progress.

Later... Another scan after some source gas changes. Much better. 35Cl+1 = 575nA 35Cl+2 = 3.5pnA with 1mm slits.

Neon support gas hand valve is closed. Source wuill require expert intervention to reignite, if there is a power bump, etc.

Later... Final tweaking done. ~10enA on FC6 with 1mm slits in, and ~23enA with 2.5mm slits in. A Stripchart of the last little while, plus present IOS tune and skimmers. Hand over to ICR at 13:25.

Beam ran quietly over the weekend, with the anticipated intensity drop-off. Source gas canister at ~15"Hg and IOS at 3.3e-7 presently. Several DRAGON energy changes were done as planned.

Later... at ~09:45 DRAGON is done.

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:

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.

Deliver concluded yesterday morning around 09:00. Pity to have to switch off the source. OLIS is now in its Shutdown.

Delivery since Friday Beam on but intensity is dropping, suggesting that enriched 33S powder is running out. Plan in place to add more this evening.

Beam petered out earlier this morning after an attempt to tweak the RF frequency. Restored. Plasma was on throughout. ICR has lowered RF amplitude to match beam intensity to yesterday's running conditions.

Delivery continued uneventfully overnight and is continuing.

Later... source is just getting better and better. See Stripchart below.

Delivery continued overnight.

Beam tuning in progress. Source gas canister at -20"Hg. MCIS pressure at 7.62e-8 Torr.