Nuclear Physics Seminars
Chris Hong , University of Virginia - Physics
[Host: Dinko Pocanic]
The Muon g-2 experiment at Fermilab (E989) is addressing the known, but not yet understood incompleteness of the Standard Model (SM) theory by measuring the anomalous magnetic dipole moment, am, defined as (gm-2)/2. To be able to test the SM predictions, the experiment aims to reach the precision of 0.14 ppm. At Fermilab a intense proton beam is passed through a target where pions are produced; after a long delay virtually all pions decay into muons, which are stored in a muon storage ring. Evaluation of am requires the measurement of the muon spin precession frequency in the storage ring and, of the mean magnetic field the stored muons experience. I will introduce the experiment, its basic measurement techniques, and will focus on the magnetic field measurement, my thesis topic. The basic method relies on the free induction decay (FID) signals from NMR probes. Of particular interest is understanding and quantifying the possible interference between the electrostatic beam focusing quadrupoles and the FID signals in the 378 "fixed" NMR probes mounted all around the storage ring.
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