  In this presentation we discuss a number of experiments on the search for
proton or deuteron EDMs, which could be carried out at COSY-Juelich. 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 10 000 s.
