on atomic and nuclear physics of exotic systems, exploiting the available unique gas jet target and electron target, bridging the gap between the beam energies at the ESR (≥ 4 MeV/u) and at HITRAP (≤ 5 keV/q) [...] electron cooling, stochastic cooling, ion optical properties at the foreseen location of the internal target as well as storage times relevant for the planned in-ring experiments. Together with the specified [...] pair-production phenomena, relativistic photon-matter interaction, correlated electron motion studied by target double-ionization, test of special relativity, bound state QED and nuclear parameters, exotic nuclear