The Cooler Synchrotron COSY delivers proton and deuteron beams in the momentum range from 300 MeV/c to 3400 MeV/c. The different modes of operationinternal experiments with thin or thick targets, external target experiments with slow extraction or with very short extraction pulses -require different ion optical conditions. Polarisation experiments are of increasing interest in the COSY community. Results of the polarisation conservation during acceleration and the beam preparation for the different experimental requirements will be presented.
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