Mainz 2022 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 73: Fundamental Symmetries II
HK 73.4: Talk
Thursday, March 31, 2022, 17:15–17:30, HK-H9
Magnetic field measurement in the Fermilab Muon g−2 experiment — •Hassan Qureshi for the Muon g–2 collaboration — Institute of Physics and Excellence Cluster PRISMA+, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
The Fermilab Muon g−2 experiment aims to measure the anomalous magnetic moment of the muon, aµ, to a precision of 140 ppb. Run 1 results were published in April 2021 with an unprecedented precision of 460 ppb. This increased the new world average deviation between the Standard Model theory prediction and the average experimental measurements to 4.2 σ. The experiment measures the muon anomalous spin precession frequency wa and the proton spin precession frequency wp, the ratio of which is used to calculate aµ. The wp value expresses the magnetic field as experienced by the circulating muons in the experiment’s storage ring. The magnetic field inside the ring is measured using two nuclear magnetic resonance (NMR) probe arrays. First is an array of 378 fixed NMR probes, spread evenly around the top and bottom walls of the vacuum chambers, which continuously measures the field drift within the muon storage ring. The second array consists of a set of 17 NMR probes, mounted on a trolley, which is periodically driven around the muon storage cavity to measure its spatial distribution of the field. In this talk I will discuss the method for tying together data from the two NMR probe arrays in time, in order to interpolate the magnetic field as experienced by muons during their storage time. Furthermore, I will discuss plans to streamline the tying procedure for Run 2 and 3 while improving the wp uncertainty compared to Run 1.