The CR storage ring in an isochronous mode operation with nonlinear optics characteristics

In the Facility for Antiproton and Ion Research (FAIR), which is presently designed at GSI (Darmstadt, Germany) a variety of new short-lived nuclides will be generated with the Super-FRS by using projectile fragmentation or uranium fission. The storage rings for the CR-RESR complex have been designed for efficient cooling and accumulation of antiprotons and cooling and deceleration of rare isotopes beams. A new Collector Ring (CR) is planned to be constructed, where one of the functions is devoted also to mass measurements of very short-lived nuclei when it is tuned to an isochronous mode. The structure of the ring lattice and its ion-optical properties in the isochronous mode are described. Nonlinear ion-optical characteristics and their influence on an achievable mass resolving power in an isochronous mode operation of the CR are discussed.