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Results from the EPICAL-2 Ultra-High Granularity Electromagnetic Calorimeter Prototype

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arxiv 2207.01815 v2 pith:23A7S5MT submitted 2022-07-05 physics.ins-det hep-ex

Results from the EPICAL-2 Ultra-High Granularity Electromagnetic Calorimeter Prototype

classification physics.ins-det hep-ex
keywords prototyperesultsbeencalorimeterdesyperformancepixelreadout
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A prototype of a new type of calorimeter has been designed and constructed, based on a silicon-tungsten sampling design using pixel sensors with digital readout. It makes use of the Alpide MAPS sensor developed for the ALICE ITS upgrade. A binary readout is possible due to the pixel size of $\approx 30 \times 30 \, \mu \mathrm{m}^2$. This prototype has been successfully tested with cosmic muons and with test beams at DESY and the CERN SPS. We report on performance results obtained at DESY, showing good energy resolution and linearity, and compare to detailed MC simulations. Also shown are preliminary results of the high-energy performance as measured at the SPS. The two-shower separation capabilities are discussed.

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