n a trip to the CMS detector at CERN this month, Fermilab’s Greg Derylo, Burt Gonzalez and Wanda Newby performed delicate surgery on the CMS forward pixel detector to replace some pixel modules requiring maintenance. The FPix is used for precision particle tracking and mounts directly around the beam pipe in the heart of the detector. It was built at Fermilab’s SiDet facility and has been temporarily removed while shutdown work at CMS is being performed.
These are just some of the 362,000 highly reflective plastic PVC tubes that will become part of NOvA’s two detectors. Each of the cells will be filled with liquid scintillator. When a neutrino strikes an atom in the liquid scintillator, it will release a burst of photons. Photodetectors will sense the resulting pattern of lighted tubes. Scientists can then determine the kind of neutrino that caused the interaction. Each cell measures 3.9 cm wide, 6.0 cm deep and 15.5 m long.