Gießen 2024 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 72: Poster

HK 72.34: Poster

Thursday, March 14, 2024, 17:15–18:45, HBR 14: Foyer

Influence of the pixel mask on the EPICAL-2 calorimeter performance — •Dani Ateyeh — IKF Goethe Universität Frankfurt

The EPICAL-2 detector, a prototype for a digital pixel calorimeter, has been developed within the context of the proposed ALICE-FoCal detector. It consists of alternating layers of tungsten absorbers and silicon pixel sensors utilising the ALPIDE chip, designed for the ALICE-ITS upgrade, with two ALPIDE chips in each EPICAL-2 layer. Each ALPIDE chip consists of 1024× 512 pixels with a size of approximately 30 × 30 µ m². The measurement of the energy of electromagnetic showers E with EPICAL-2 is based on counting charged shower particles via the number of pixel hits N_hit contrary to the direct measurement of deposited energy in conventional calorimeters.

Some pixels in the ALPIDE chips employed in the EPICAL-2 may be malfunctioning, either noisy or dead. To identify malfunctioning chips in the detector, criteria for a pixel masking procedure have been developed using experimental data acquired in test-beam measurements at DESY and at CERN-SPS. These pixels have been excluded from the analyses.

To investigate the influence of the malfunctioning pixels on the calorimeter performance, different scenarios of the amount of malfunctioning pixels have been investigated. In this poster, we present the influence of different masking schemes on the calorimeter performance with focus on the energy response and energy resolution.
Supported by BMBF and the Helmholtz Association

Keywords: EPICAL-2, Calorimeter, Pixel mask