Muon catcher in NOvA cavern

The first piece of the NOvA near detector is now installed in the underground detector hall. The picture shows the very downstream end of the muon neutrino detection unit, called a muon catcher. The unit consists of 10 layers of 4-inch-thick heavy steel plates sandwiched by two layers of PVC plastic calorimetry modules. PPD engineers and technicians are constructing and installing the detector unit. It will take two more weeks to finish installation of the whole muon catcher unit. Photo: Cindy Arnold