Front End for a Neutrino Factory or Muon Collider

Abstract: A neutrino factory or muon collider requires the capture and cooling of a large number of muons. Scenarios for capture, bunching, phase-energy rotation and initial cooling of {\mu}'s produced from a proton source target have been developed, initially for neutrino factory scenarios. They require a drift section from the target, a bunching section and a {\phi}-{\delta}E rotation section leading into the cooling channel. Important concerns are rf limitations within the focusing magnetic fields and large losses in the transport. The currently preferred cooling channel design is an "HFOFO Snake" configuration that cools both {\mu}+ and {\mu}- transversely and longitudinally. The status of the design is presented and variations are discussed.