Speaker
Description
The Fermilab E989 Muon g-2 experiment is a precise measurement of the muon anomalous magnetic moment $a_{\mu}$ by detecting decays of muons stored in a ring. The first result of the E989 Muon g-2 experiment, with $a_{\mu}$ uncertainty of 460 ppb, deviated by 4.2 standard deviations from the Standard Model theory prediction. The goal of E989 is to reach the precise of 140 ppb in $a_{\mu}$. Two measurements: of the precession spin frequency, $\omega_a$, and of the shielded-proton Larmor precession frequency, $\tilde{\omega_p}’$ are needed in order to determine $a_{\mu}$. The frequency $\omega_a$ is measured by detecting decay positrons in 24 calorimeter detectors installed uniformly around the storage ring and by exploiting the parity violation in $\mu^+$ decay. The frequency $\tilde{\omega_p}’$ is determined from highly precise field measurements performed by using nuclear magnetic resonance (NMR) techniques. Three types of NMR probes are used to measure the field for different purposes. This paper will focus on the role of each NMR probe and the methods used to extract the frequency from the NMR probe data through the application of appropriately constructed NMR models in a non-uniform field. Finally, I will discuss the field systematic associated with the NMR techniques
