|PPD engineers and technicans install the first PVC unit of the NOvA Near Detector. Photo: Cindy Arnold|
NOvA started the installation of its PVC plastic detector units for the near detector on Aug. 21, after many months of preparation work in the CDF building. PPD first assembled each detector unit, made of 24 layers of fully active volumes for neutrino interaction detection, at CDF. The detector units then took an hour-long, low-speed trip to the Minos surface building before being lowered down into the detector hall 350 feet below ground. The picture shows PPD technicians and engineers in the process of placing the first PVC unit in the underground detector hall.