Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Instrumentation XII

HK 52.5: Vortrag

Donnerstag, 13. März 2025, 16:45–17:00, SR Exp1B Chemie

Results from the Digital Calorimeter Prototype EPICAL-2 — •Johannes Keul — Institut für Kernphysik Frankfurt

A prototype of a novel digital electromagnetic calorimeter, EPICAL-2, has been developed. The R&D is performed in the context of the ALICE-FoCal and is strongly related to studies of imaging in proton CT. Digital calorimetry also proves promising for future collider projects like EIC, ILC, CLIC, or FCC.

Based on proof of principle with a first prototype, EPICAL-2 has been constructed as an advanced second prototype. EPICAL-2 consists of 24 layers with alternating tungsten absorbers and ALPIDE MAPS. The design features an active area of approximately 30  x  30  mm² and a depth of 20 radiation lengths, totaling over 25 million pixels.

EPICAL-2 test-beam measurements were performed at DESY in February 2020 and CERN-SPS in September 2021. The DESY test-beam campaign results have been published in [1], showing good energy resolution and linearity.

This contribution will report on energy resolution and linearity measurements for different definitions of the detector response in the EPICAL-2 and compare it to a detailed MC simulation. Furthermore, shower shape studies will be presented and studies of the Molière radius in the EPICAL-2 will be shown.

[1] J.Alme et al 2023 JINST 18 P01038

Supported by BMBF and the Helmholtz Association.

Keywords: Calorimetry; MAPS; Detector R&D