complex which consists of the linear accelerator UNILAC, the heavy-ion synchrotron SIS and the experimental storage-cooler ring ESR. Ions of all elements, from hydrogen to uranium, can be accelerated up [...] gical effects of ion beams Experimental stations and various instrumentation (incl. the new Materials Research Branch at the UNILAC) for applications of high and low energy heavy ion beams in materials [...] 90% of the velocity of light. Moreover, beams of artificially created unstable nuclei - radioactive ion beams - are available for the research programme, as well as beams of highly ionized atoms up to bare