Stochastic cooling and extraction at COSY

COSY is a cooler synchrotron and storage ring delivering high precision proton beams with momenta between 300 MeV/c and 3400 MeV/c for experiments in medium energy physics. Two cooling systems are used. An electron cooler that reaches up to a momentum of 600 MeV/c and a stochastic cooling system that covers the upper momentum range from 1500 to 3400 MeV/c. Horizontal and vertical as well as longitudinal stochastic cooling by the filter method are successfully applied for internal experiments with cluster targets. Third order resonant extraction and stochastic extraction are used to serve external experiments. A nearly ideal rectangular spill of 5 to more than 50 s has been achieved with the stochastic feeding system. In addition, a polarized beam was successfully extracted.