Abstract
In the following years, the Fermilab Muon Campus will deliver highly polarized muon beams to the Muon $g\ensuremath{-}2$ experiment. The Muon Campus contains a target section wherein secondaries are produced, the delivery ring which separates the muons from the rest of the beam, and a sequence of beam lines that transports them to the Muon $g\ensuremath{-}2$ storage ring. Here, we report the first results of beam measurements at the Muon Campus with an emphasis on the key achievements that have contributed to the successful beam delivery to the Muon $g\ensuremath{-}2$ experiment. These achievements include the production of an intense secondary beam from the target, its transport over 2 km, the successful monitoring of muons from the available diagnostics, and the development of techniques for measuring the transverse optics. We also present detailed comparisons between the experimental data and simulation and discuss the similarities and differences observed.
Highlights
The Muon g − 2 experiment at Fermilab [1] will measure the anomalous magnetic moment of the muon, α 1⁄4 ðg − 2Þ=2, with an unprecedented precision of 0.14 parts per million
G is the gyromagnetic moment of the muon; for a pure Dirac particle, g 1⁄4 2, and α refers to the anomalous relative deviation from this value
A polarized beam of positive muons is injected into a storage ring with a vertical magnetic field [2]
Summary
The Muon g − 2 experiment at Fermilab [1] will measure the anomalous magnetic moment of the muon, α 1⁄4 ðg − 2Þ=2, with an unprecedented precision of 0.14 parts per million. A polarized beam of positive muons is injected into a storage ring with a vertical magnetic field [2]. We report the first experimental results of the Fermilab Muon Campus with an emphasis on the milestones that have demonstrated the Muon Campus capability of delivering a beam to the Muon g − 2 experiment These milestones include the interaction of the primary proton beam with the target, the generation and transport of muons over long sections, the monitoring of secondaries from the available diagnostics, and the development of techniques for measuring the beam optics. The performance of the Muon Campus beam lines downstream of the production target was simulated using G4beamline. Notice that all simulation performances reported hereafter correspond to the baseline design parameters, which are discussed in more detail in Ref. [14]
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