|NOvA’s first near-detector block, the muon catcher, is now installed in the underground detector hall. Photo: Cindy Arnold|
PPD engineers and technicians completed the installation of the NOvA experiment’s first near-detector block, the muon catcher, in the underground detector hall on Aug. 1. The muon catcher consists of 10 layers of 4-inch-thick heavy steel plates sandwiched by two layers of PVC plastic calorimetry modules. This picture shows one steel unit sitting on a pair of channel guide tracks and in the process of being moved to its final position.