Abstract :
After their acceleration, the beta radioactive ions are accumulated in a decay ring [1]. The losses due to their decay are compensated with regular injections in presence of filled bucket. Without a damping mechanism, the new ions are injected at a different energy from the stored beam energy, then the old and the new buckets are merged with RF manipulation. This type of injection has to be done, in a dispersive region, in presence of a closed orbit bump and a septum magnet. The sizes of the injected beam and of the stored beam have to be adjusted in order to minimize the losses on the septum and to maximize the stored intensity keeping small beam sizes. The dispersion has to be large enough in order to decrease the energy difference.
