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In this presentation we discuss a number of experiments on the search for proton or deuteron EDMs, which could be carried out at COSY-Julich. Most promising is the use of an radio-frequency radial electric field flipper that would lead to the accumulation of a CP violating in-plane beam polarization by tiny spin rotations. Most crucial for storage ring searches for EDMs is the spin-coherence time, and we report on analytic evaluations which point at a much larger spin-coherence time for deuterons by about a factor of 200 compared to the one for protons, and at COSY, the spin coherence time for deuterons could amount to about 10 5 s.

Precursor experiments to search for permanent electric dipole moments of protons and deuterons at COSY