[en] During the last years GSI developed plans for future accelerators and experimental facilities with the intention to extend heavy ion research in a wide scope to higher energies and into new fields of research using novel techniques for acceleration, accumulation, storage and phase space density increase of heavy ion beams up to ²³⁸U. The prime goals of this development plan using as a first step a synchrotron acceleration ring connected with an accumulator-, storage-, cooling- and experimental ring are the following: 1. Provide completely stripped heavy ion beams up to U⁹²⁺ with the highest possible phase space densities using various cooling techniques in a storage ring. 2. Provide radioactive heavy ion beams by accumulation, storage and cooling of fragmentation or fission products from beams of the synchrotron. 3. Provide facilities for internal target experiments using simultaneously cooled circulating beams. 4. Provide two merging beams in the storage ring with well defineable collision energies up to the Coulomb barrier of the heaviest ions like U⁹²⁺ in order to study atomic collision processes in high Coulomb fields with both nuclei highly ionized. 5. Provide a beam of heavy ions up to U⁹²⁺ with best phase space density for further acceleration and collisions in superconducting collider rings at very high c.m. energies (> 20 GeV/u) and as high as possible luminosities. (orig.)