Meeting in Orsay 7 December 2004

Present: J-L, Biarrotte, A. Chance, R. DuperrierT. Lamy, B. Laune, F. Lemuet, M. Lindroos, F. Meot, A. Muller, O. Napoly, J. Payet, P. Sortais, A. Tkatchenko

The objective of the meeting was to agree on suitable work packages and work tasks for the different groups working in France on the beta-beam.

Three presentations were made:

1. Mats Lindroos on the status of the EURISOL Design study
2. Jacques Payet on the status of the design of a high energy decay ring
3. Presentation prepared by Michael Benedikt on the status of the beta-beam task within the design study

The outcome can be summarised as follows:

• The CEA team lead by Jacquet Payet will focus on the design of the high energy decay ring (gamma 100-150 for ¹⁸Ne and ⁶He).
• The IN2P3-Orsay team lead by Andrew Tkatchenko will focus on the design of the low energy part (below PS energies).
• Jean-Francois Meot will look into the possibility to use an FFAG type machine (scaling?) for (part of) the low energy stage. A milestone was set for this particular sub-task for the proposed September meeting of the beta-beam task.
• Bernard Laune will look into the possibility to use a cyclotron for (part of) the low energy stage. Just as for the FFAG sub-task a milestone was set for this particular sub-task for the proposed September beta-beam meeting.
• Theirry Lamy and Pascal Sortais from IN2P3-LPSC in Grenoble believed it possible to have some first estimate for a charge state distribution and plasma density from the 60 GHz ECR source for the September beta-beam meeting.
• The final technology choice for the low energy stage of the beta-beam, including the need of a special linear accelerator for acceleration of multiple charge states will be taken before the end of 2005 so that all resources can be re-focused to the chosen option for the three remaining years of the design study.