Neutrino Factory Parameters from Feasibility Studies 1 and 2

A μ-storage ring neutrino factory has somewhat different requirements on the muon beams from those of a μ +-μ- collider. The ν-source event rate depends primarily on the number of stored muons and not on the quality of the μ-beam; therefore the beam needs only to be cooled sufficiently to be within the acceptance of the accelerator and storage ring, and not to a minimal emittance for high luminosity. Also the μ-beam need not be confined within single bunches, but can be distributed in a string of bunches. The MC collaboration has produced two detailed Neutrino Factory design studies[1,2]. Both studies have a similar muon collection and cooling system. A schematic layout of the Study 1 scenario is shown in Fig. 1a. Following the target there is a 50 m long drift, a 100 m long induction linac for phase rotation, a mini-cooling stage, a 17 m long buncher and a 140 m long cooling section. The Study 2 scenario layout is shown in Fig. 1b. It has a 18 m drift following the target, a 108 m induction linac, a mini-cooling stage, an additional 200 m of induction linac and drift to complete the phase rotation, a 55 m buncher and a 108 m cooling section, for a total length of 540 m, about 200m longer than Study 1. Most of the following description will concentrate on th