SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 43: Fundamental Symmetries II

HK 43.3: Vortrag

Mittwoch, 22. März 2023, 16:45–17:00, SCH/A252

Effect of magnet cycling on the magnetic field tracking uncertainties in the Fermilab g–2 experiment — •René Reimann, Mohammad Ubaidullah Hassan Qureshi, and Martin Fertl for the Muon g–2 collaboration — Institute of Physics and Excellence Cluster PRISMA+, Johannes Gutenberg University Mainz, 55099 Mainz, Germany

The Muon g–2 Collaboration has presented the most precise measurement of the anomalous magnetic moment a_µ with an uncertainty of 460 ppb. To achieve the goal of 140 ppb uncertainty, more than a factor of nine times the published data have been recorded, but systematic uncertainties must also be reduced. A key parameter in determining a_µ is the precise value of the homogeneous 1.45 T magnetic field in which the muons are stored. Two systems using nuclear magnetic resonance (NMR) techniques are used to track the magnetic field in the muon storage ring. One system measures the spatial magnetic field distribution every few days in the storage region itself, and the other system measures the magnetic field drift continuously with probes in the walls of the vacuum chambers of the storage ring. Cycling the storage ring magnet introduces additional field drifts which are challenging for the tracking of the averaged magnetic field. In this talk, I will present the effect of magnet cycling on the tracking of the magnetic field and its uncertainty.