Measurement of Transient Magnetic Fields of Interest to the Muon g-2 Experiment at Fermilab

Presenter

Mor Evron

Campus

UMass Amherst

Sponsor

David Kawall, Department of Physics, UMass Amherst

Schedule

Session 4, 2:30 PM - 3:15 PM [Schedule by Time][Poster Grid for Time/Location]

Location

Poster Board A88, Campus Center Auditorium, Row 5 (A81-A100) [Poster Location Map]

Abstract

The Muon g-2 experiment at Fermilab uses ultraprecise measurements of magnetic fields and muon decay to obtain a measurement of the anomalous magnetic moment of the muon, probing the limits of the Standard Model. 

In the experiment, a beam of muons, fundamental particles similar to electrons, circulate in a magnetic storage ring. Getting the muons on a stable orbit requires a brief “kick” from a powerful magnetic field. Measuring the effects of this kick is essential to understanding the behavior of the muons in the storage ring and for determining the muon's magnetic moment. 

This study characterizes the effects of eddy currents induced in the metal vacuum chamber surrounding the kicker. Of interest is the spatial dependence of the magnetic fields produced by these currents, both azimuthally and in the transverse plane. These measurements are challenging to acquire at Fermilab. To this end, a scale replica of the apparatus, including a removable metal box, has been constructed. Using a coil of wire to detect the changing magnetic field along the muons’ path, measurements are taken to determine the strength of the eddy currents.

The data acquired display reproducibility to the level of a fraction of a percent, sufficient to observe the desired physical effects. This means the data will contribute to important reductions in uncertainty on the g-2 measurement. Additionally, the measurements are compared to models of varying sophistication. The data acquired suggest that simplistic models are not sufficient to describe eddy current behavior.

Keywords

particle physics, muons, Standard Model, experimental physics

Research Area

Physics and Nanotechnology

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