LONGITUDINAL ACCUMULATION OF ION BEAMS IN THE ESR SUPPORTED BY ELECTRON COOLING

Recently, two longitudinal beam compression schemes have been successfully tested in the Experimental Storage Ring (ESR) at GSI with a beam of bare Ar ions at 65 MeV/u injected from the synchrotron SIS. The first employs Barrier Bucket pulses, the second makes use of multiple injections around the unstable fixed point of a sinusoidal rf bucket at h=1. In both cases, continuous application of electron cooling maintains the stack and merges it with the freshly injected beam. These experiments provide the proof of principle for the planned fast stacking of Rare Isotope Beams (RIBs) in the New Experimental Storage Ring (NESR) of the FAIR project.