Design for a Muon Front End with Magnetically Shielded RF Cavities

In the baseline Neutrino Factory muon front end, strong, closely spaced solenoid magnets are used to contain the high emittance muon beam. In addition, significant acceleration is required for bunching, phase rotation and cooling, requiring RF cavities operating near to their maximum achievable gradient. There are experimental indications that RF cavities may not be able to achieve these large gradients in the presence of such intense magnetic fields. In this paper, I discuss the design of a muon cooling channel that is designed with RF cavities removed from the intense magnetic fields, and examine the change in performance that results from this compromise.