Monte Carlo Simulations for the Shielding of the Collector Ring and the Recycled Experimental Storage Ring at FAIR

In the next years the Gesellschaft fuer Schwerionenforschung and international partners will realize the new international accelerator Facility for Antiproton and Ion Research (FAIR) for research with heavy ions, radioactive ions, and antiprotons. Two important storage rings of FAIR are the collector ring (CR) and the recycled experimental storage ring (RESR), which are located together in the same building: The CR is optimized for fast cooling of heavy ions and antiprotons, while the RESR is mainly used for accumulation of antiprotons.

The concrete shielding for the CR and RESR is presented on the basis of several Monte Carlo simulations for radiation transport with the latest version of the FLUKA code. Extensive shielding calculations had to be done because of diverse beam types including different locations of beam losses. The goal of the simulations is to reveal possible weak points in the shielding and to ensure a dose rate outside the storage rings and in the technical supplies' room to a value of <0.5 Sv/h so that this area is accessible without any restrictions.