The FoCal prototype - An extremely fine-grained electromagnetic calorimeter using CMOS pixel sensors
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Publication date
2018-01-19
Authors
de Haas, A.P.
Nooren, G.
Peitzmann, T.
Reicher, M.
Rocco, E.
Röhrich, D.
Ullaland, K.
van den Brink, Ton
van Leeuwen, M.
Wang, H.
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Document Type
Article
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Abstract
A prototype of a Si-W EM calorimeter was built with Monolithic Active Pixel Sensors as the active elements. With a pixel size of 30 μm it allows digital calorimetry, i.e. the particle's energy is determined by counting pixels, not by measuring the energy deposited. Although of modest size, with a width of only four Moliere radii, it has 39 million pixels. In this article the construction and tuning of the prototype is described. Results from beam tests are compared with predictions of GEANT-based Monte Carlo simulations. The shape of showers caused by electrons is shown in unprecedented detail. Results for energy and position resolution are also given.
Keywords
Calorimeter methods, Particle identification methods, Solid state detectors, Instrumentation, Mathematical Physics
Citation
de Haas, A P, Nooren, G, Peitzmann, T, Reicher, M, Rocco, E, Röhrich, D, Ullaland, K, van den Brink, T, Leeuwen, M V, Wang, H, Yang, S & Zhang, C 2018, 'The FoCal prototype - An extremely fine-grained electromagnetic calorimeter using CMOS pixel sensors', Journal of Instrumentation, vol. 13, no. 1, P01014. https://doi.org/10.1088/1748-0221/13/01/P01014