  A new experiment at Fermilab will measure the anomalous magnetic moment of
the muon with a precision of 140 parts per billion (ppb). This measurement is
motivated by the results of the Brookhaven E821 experiment that were first
released more than a decade ago, which reached a precision of 540 ppb. As the
corresponding Standard Model predictions have been refined, the experimental
and theoretical values have persistently differed by about 3 standard
deviations. If the Brookhaven result is confirmed at Fermilab with this
improved precision, it will constitute definitive evidence for physics beyond
the Standard Model. The experiment observes the muon spin precession frequency
in flight in a well-calibrated magnetic field; the improvement in precision
will require both 20 times as many recorded muon decay events as in E821 and a
reduction by a factor of 3 in the systematic uncertainties. This paper
describes the current experimental status as well as the plans for the upgraded
magnet, detector and storage ring systems that are being prepared for the start
of beam data collection in 2017.
