  An "ultimate" high intensity proton source for neutrino factories and/or muon
colliders was projected to be a ~4 MW multi-GeV proton source providing short,
intense proton pulses at ~15 Hz. The JPARC ~1 MW accelerators provide beam at
parameters that in many respects overlap these goals. Proton pulses from the
JPARC Main Ring can readily meet the pulsed intensity goals. We explore these
parameters, describing the overlap and consider extensions that may take a
JPARC-like facility toward this "ultimate" source. JPARC itself could serve as
a stage 1 source for such a facility.
