Abstract
The design of a low-energy (4 GeV) neutrino factory (NF) is described, along with its expected performance. The neutrino factory uses a high-energy proton beam to produce charged pions. The ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ decay to produce muons (${\ensuremath{\mu}}^{\ifmmode\pm\else\textpm\fi{}}$), which are collected, accelerated, and stored in a ring with long straight sections. Muons decaying in the straight sections produce neutrino beams. The scheme is based on previous designs for higher energy neutrino factories, but has an improved bunching and phase rotation system, and new acceleration, storage ring, and detector schemes tailored to the needs of the lower energy facility. Our simulations suggest that the NF scheme we describe can produce neutrino beams generated by $\ensuremath{\sim}1.4\ifmmode\times\else\texttimes\fi{}{10}^{21}$ ${\ensuremath{\mu}}^{+}$ per year decaying in a long straight section of the storage ring, and a similar number of ${\ensuremath{\mu}}^{\ensuremath{-}}$ decays.
Highlights
In the past few years, solar [1], atmospheric [2], reactor [3], and accelerator [4] neutrino experiments have revolutionized our understanding of the nature of neutrinos
Our simulations suggest that the neutrino factory (NF) scheme we describe can produce neutrino beams generated by $1:4 Â 1021 þ per year decaying in a long straight section of the storage ring, and a similar number of À decays
Compared with higher energy NFs, a 4 GeV NF would require a less expensive acceleration scheme, a cheaper storage ring, and an experimental baseline L that is well matched to a beam that originates at the U.S particle physics laboratory (FNAL) and points to a detector in the proposed Deep Underground Science and Engineering Laboratory (DUSEL) site at the Homestake Mine in South Dakota (L 1⁄4 1290 Km)
Summary
In the past few years, solar [1], atmospheric [2], reactor [3], and accelerator [4] neutrino experiments have revolutionized our understanding of the nature of neutrinos. An ambitious experimental program is required to completely determine the mass spectrum, the mixing matrix, and whether there is observable CP violation in the neutrino sector. Beyond this initial program, precision measurements will be required to discriminate between competing models that attempt to describe the underlying physics. Compared with higher energy NFs, a 4 GeV NF would require a less expensive acceleration scheme, a cheaper storage ring, and an experimental baseline L that is well matched to a beam that originates at the U.S particle physics laboratory (FNAL) and points to a detector in the proposed Deep Underground Science and Engineering Laboratory (DUSEL) site at the Homestake Mine in South Dakota (L 1⁄4 1290 Km). In the following we describe an initial design for a 4 GeV NF, emphasizing those aspects that differ from previous designs for higher energy NFs
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