LPSC, Grenoble
A 1+ surface ionisation source has been used to produce Sodium and Rubidium beams in order to compare the PHOENIX Booster capture efficiency for different ion masses but with the same beam optics. Yields of 1.9% for 23Na6+ and 3.5% for 85Rb15+, with charge breeding times of 8,6ms/q and 4,6ms/q respectively have been measured. 1+ and n+ emittance measurements are presented along with the capture sensitivity to different parameters (DeltaV plots). Technical modifications have been performed to the charge breeder : replacement of the plasma chamber to allow a double frequency operating (14 + 18 GHz), modification of the injection magnetic plug to reinforce the axial magnetic field and correct its dissymmetry in the 1+ beam deceleration zone, insulation improvement to allow 60kV operation for the SPIRAL2 project. First charge breeding experimental results at 14 and 18GHz in the new configuration are presented and discussed for Rb beams
