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

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...

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Bibliographic Details
Published in:Journal of instrumentation 2018-01, Vol.13 (1), p.P01014-P01014
Main Authors: de Haas, A.P., Nooren, G., Peitzmann, T., Reicher, M., Rocco, E., Röhrich, D., Ullaland, K., Brink, A. van den, Leeuwen, M. van, Wang, H., Yang, S., Zhang, C.
Format: Article
Language:English
Subjects:
Active pixel sensors
CMOS
Computer simulation
Pixels
Prototypes
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Summary: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.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/13/01/P01014