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

Abstract

In this presentation we discuss a number of experiments on the search for proton or deuteron EDMs, which could be carried out at COSY-Jülich. 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. 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 105 s.