Accelerators for future neutrino facilities: strengths and challenges

Several different ideas have been put forward for future neutrino facilities, including a high-power conventional neutrino beam (a Superbeam facility), a Beta Beam facility based on stored beta-unstable ion beams, and a Neutrino Factory based on stored muon beams. Each of these has its advantages and disadvantages, and these are described here. After briefly describing the physics context, the various options will be described and their respective strengths and challenges indicated. The supporting R&D programs will be briefly discussed and a few specific technical questions for each facility will be outlined.