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

Abstract

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 particles' 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. We describe the construction and tuning of the prototype and present results from beam tests and compare them with predictions of GEANT-based Monte Carlo simulations. We show the shape of showers caused by electrons in unprecedented detail. Results for energy and position resolution will also be given.

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• Direct Photons from Relativistic Heavy-Ion Collisions
• A High Granularity Imaging Calorimeter for Cosmic-Ray Physics
• First results of the CALICE SDHCAL technological prototype
• Design and performance of a CMOS study sensor for a binary readout electromagnetic calorimeter
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Cited by in corpus (8)

• Fabrication and beam test of a silicon-tungsten electromagnetic calorimeter
• Design and Performance of a Silicon Tungsten Calorimeter Prototype Module and the Associated Readout
• Performance of the Electromagnetic Pixel Calorimeter Prototype EPICAL-2
• Results from the EPICAL-2 Ultra-High Granularity Electromagnetic Calorimeter Prototype
• Performance of the electromagnetic and hadronic prototype segments of the ALICE Forward Calorimeter
• Performance of the ALICE electromagnetic calorimeters in LHC Runs 1 and 2 and upgrade projects
• Upgrade of the ALICE experiment beyond LHC Run 3
• Detailed Measurements of Shower Properties in a High Granularity Digital Electromagnetic Calorimeter