  A high-energy muon collider scenario requires a final cooling system that
reduces transverse emittance to ~25 microns (normalized) while allowing
longitudinal emittance increase. Ionization cooling using high-field solenoids
(or Li Lens) can reduce transverse emittances to ~100 microns in readily
achievable configurations, confirmed by simulation. Passing these muon beams at
~100 MeV/c through cm-sized diamond wedges can reduce transverse emittances to
~25 microns, while increasing longitudinal emittances by a factor of ~25.
Implementation will require optical matching of the exiting beam into
downstream acceleration systems.
