The FoCal prototype - an extremely fine-grained electromagnetic calorimeter using CMOS pixel sensors

A. P. de Haas, G. Nooren, T. Peitzmann +9

A prototype of a Si-W EM calorimeter was built with Monolithic Active Pixel Sensors as the active elements. With a pixelsize of 30 $\mu$m it allows digital calorimetry, i.e. the part…