  A new, hybrid design is proposed to eliminate the main systematic errors in
the frozen spin, storage ring measurement of the proton electric dipole moment.
In this design, electric bending plates steer the particles, and magnetic
focusing replaces electric. The magnetic focusing should permit simultaneous
clock-wise and counter-clock-wise storage to cancel systematic errors related
to the out-of-plane dipole electric field. Errors related to the quadrupole
electric fields can be eliminated by successive runs of magnetic focusing with
different strengths.
