The Trolley’s Journey in the Muon g-2 Experiment

In an experiment called Muon g-2, housed at DOE’s Fermi National Accelerator Laboratory, scientists are putting our current understanding of the universe to the test. The experiment may reveal the existence of new particles or forces if theoretical predictions differ from the experimental results. Scientists at DOE’s Argonne National Laboratory employ and maintain a unique system that maps the magnetic field with unprecedented precision throughout the experiment’s 45-meter circumference ring. A trolley drives field measurement probes around the ring every three days in both directions, taking around 9,000 measurements per probe and direction. The scientists take the measurements to construct slices of the magnetic field and then a full, 3D map of the ring to inform the final results of the experiment. This video shows what the trolley sees as it circulates the ring.