Neutrino Factory Designs and R and D

The development of a very intense muon source capable of producing a millimole of muons per year would enable a Neutrino Factory [1], and perhaps eventually a Muon Collider [2], to be built. In the last two years Neutrino Factory physics studies [3] have mapped out an exciting Neutrino Factory physics program. In addition, Neutrino Factory feasibility studies [4-6] have yielded designs that appear to be ''realistic'' provided the performance parameters for the critical components can be achieved. Some of the key components will need a vigorous R and D program to meet the requirements. Neutrino Factory R and D activities in Europe [7], Japan [6,8], and the US [9] have resulted in three promising variants of the basic Neutrino Factory design. In the following the various Neutrino Factory schemes are briefly described. The main R and D issues and the ongoing R and D programs are summarized