  The neutrino beam produced from muons decaying in a storage ring would be an
ideal tool for precise neutrino cross section measurements and the search for
sterile neutrinos due to its precisely known flavour content and spectrum. In
the proposed nuSTORM facility, pions would be directly injected into a
racetrack storage ring, where the circulating muon beam would be captured. In
this paper we show that a muon decay ring based on a racetrack scaling FFAG
(Fixed Field Alternating Gradient) with triplet focusing structures is a very
promising option with potential advantages over the FODO based solution. We
discuss the ring concept, machine parameters, linear optics design, beam
dynamics and the injection system.
