The forthcoming Mu2e experiment at Fermilab will kidnap muons and trap them in aluminum atoms. But what exactly happens when you shoot a muon at an aluminum foil? While Mu2e is under construction, its scientists are already getting some valuable answers from a smaller accomplice: AlCap.

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.