Muon g-2

The Muon g-2 experiment will measure of the strength of the magnetic field of a subatomic particle called a muon. If the measurement doesn’t overlap with the predicted value, it could point to the scientific community’s next big breakthrough, and we may have to rewrite the textbooks.

It survived a month-long journey over 3,200 miles, and now the delicate and complex electromagnet is well on its way to exploring the unknown. The Muon g-2 ring has successfully cooled down to operating temperature and powered up, proving that even after a decade of inactivity, it remains a vital and viable scientific instrument.

The Muon g-2 experiment at Fermilab is under construction in the new MC-1 building. It aims to measure with unprecedented precision — 140 parts per billion — a property of the muon called the anomalous magnetic dipole moment. The effort will improve upon the famous experiment at Brookhaven National Laboratory, which finished data taking in 2001. The new Fermilab experiment aims to improve the precision with 20 times more data and by reducing key systematic uncertainties. These factors significantly affect… More »

You are looking at a silicon detector at the end of the inflector region of the Muon g-2 experiment. This region is the area in which a specialized magnet bends muons after they exit the Muon Delivery Ring (the former Antiproton Debuncher) and enter the Muon g-2 storage ring, which curves to the left in the picture.

One year ago, the 50-foot-wide Muon g-2 electromagnet arrived at the U.S. Department of Energy’s Fermi National Accelerator Laboratory in Illinois after traveling 3,200 miles over land and sea from Long Island, New York. This week, the magnet took the final few steps of that journey, moving across the Fermilab site and into the new building that now houses it.