>
>
>DRAGON Minutes                                                         
>16 November 2004
>
>Present: CJ (recorder), DH, DO, GR, DG, PM, CR, WRH, MT, JDA, CV,LB,AO
>
>-CV: The ion chamber was "hiccupping".  CV tested it with a 3 MeV alpha 
>source, and found that it displayed a 7% resolution.  The spectra 
>suggested that the alphas did stop in the IC, when the iosobutane pressure 
>was at 25 torr (he used a bias of between 400 and 450 V).  The trigger for 
>the IC was provided by a fast filter timing amplifier.  CV believe that 
>this amplifier caused the problems with the last run.
>         +Someone will go with CV to check on the electronics of the IC.
>-Everything else is set for the upcoming run.
>-Barry Ross has taken back the controller for TP9 and replaced it.
>-For the upcoming run, the EDs have been conditions to bend 0.2 MeV 12C.
>-Before we run we need:
>         +A list of accessible charge states
>         +A guide for desirable gas target pressures
>         +We need limits on the accessible charge states
>         +We need a written run plan
>-The 12C beam will enter the gas target with a charge state of 3+.
>-The objective of this run is to understand the pressure dependence of the 
>charge state distribution.
>-LB is the "goto" person for this run.
>-JDA suggested that we use a table that people can fill in as we complete 
>the charge state measurements.
>-When we finish a measurement at a given energy, we need to decide whether 
>or not to repeat it or more on to the next energy.
>-We will be measuring 0.2 MeV 12C on late Thursday and early Friday, then 
>we will go to 16O.
>-The gas in the target will be 4He.
>-The results of this measurement could be for a NIM article.
>-On Thursday, we will use the thick (mylar) window, and on Friday we will 
>use the thin (polypropylene) window.
>-Mike and Peter have been doing 13C tests using the ECR on the offline system.
>         +The charge state booster is broken, so this allows us to use the 
> ECR system
>         + They have seen a C13 beam and a rough estimate is ~ 1% at mass 
> 13 and 10% efficiency at 29
>         + Today, they hope to characterize the system further.
>-JDA is making a request to Jean-Michel Poutissou for 11C to test the 
>alternate method approach on the offline source.
>-Once the charge state booster is fixed, access to the ECR will be more 
>limited.
>-Mark Huyse is coming from Louvain-la-Neuve in February for a 6 month 
>sabatical with DRAGON.
>         +He also wants to do a 11Li experiment probably using TUDA
>-W. Lui is sending a graduate student to do offline 11C work for about 1 year.
>-Status of the laser source with Ga: they are checking the laser alignment 
>on the target module using an in-situ device
>-They are thinking of putting in a different diagnostic system for the 
>proton beam.
>-CR has combined 70% of the two different GEANT versions.