Planned new cooler/storage ring complex for radioactive beams and antiprotons at GSI

Radioactive ions (RIs) and antiprotons (pbars) play a major role in the new planned GSI facility. After shooting 1 GeV/u pulses of up to 10¹² primary ions with a length of 50 ns on a production target, secondary RI beams are prepared in a superconducting fragment separator. Pbars originate from a primary 30 GeV proton beam of 1.5 * 10 ¹³ particles. A dedicated collector ring (CR) serves for precooling of RI´s at 740 MeV/u and of pbars at 3 GeV. Active debunching and stochastic cooling provide beams of sufficient quality. In order to fulfill the different requirements of stochastic cooling of the two types of beam, a novel split ring lattice design is applied. Isochronous RI mass measurements are possible in the CR too. A second ring, the New Experimental Storage Ring, serves for beam accumulation and, in the case of RI beams, internal experiments. Optimum conditions for RI experiments are reached by electron cooling. An internal target as well as an electron nucleus scattering facility open up new frontiers for the investigation of nuclear properties far from stability. The pbar beams are accumulated by stochastic cooling. The paper discusses beam physics aspects of the new storage rings