  The Storage Ring EDM Collaboration is completing a comprehensive proposal to
DOE for a sensitive proton EDM experiment at the 10-29e\cdot cm level. This
involves building an electric ring of radius R~40 m, with bending provided by
stainless steel plates separated by 3 cm gap, providing an electric field of 10
MV/m. This ring can store protons of 0.7 GeV/c momentum, also known as "magic"
due to the unique property that the spin and momentum vectors precess at the
same rate in any electric field. If the spin is kept longitudinal for most of
the duration of the storage time, the radial E-field acts on the proton
electric dipole moment and can cause a measureable vertical spin precession.
Studies on spin coherence time, on the polarimeter system, and the electric
field show that we can reach the experimental goals. A plan on the relative
beam position monitors uses currently available technology and applies it in an
accelerator environment. Some R&D is needed to establish the feasibility of the
plan. Prospects of further improvement with a future upgrade for another order
of magnitude in the EDM sensitivity are also laid out.
