What question did this study set out to answer?

To evaluate the performance of Silicon Photomultiplier (SiPM) arrays for the SCT prototype of the CTA observatory.

April 11, 2026

Characterization of FBK SiPM arrays for the SCT medium size telescope prototype proposed for the CTA observatory

SLS. LoporchioIstituto Nazionale di Fisica Nucleare, Sezione di Bari

Key Points

To evaluate the performance of Silicon Photomultiplier (SiPM) arrays for the SCT prototype of the CTA observatory.
Characterization of Near UltraViolet High-Density 6 x 6 mm² SiPMs in laboratory settings.
Assembly of more than 100 arrays, each containing 16 pixels.
Assessment of optical module performance for integration into the pSCT camera.
Characterization results indicate effective detection of low- and fast-intensity Cherenkov signals.
Performance uniformity across arrays shows promising capabilities for IACT applications.

Abstract

The Cherenkov Telescope Array (CTA) will represent the new generation of Imaging Atmospheric Cherenkov Telescopes (IACTs), aimed to deteci. very high-energy gamma-rays produced in atmospheric showers. The prototype Schwarzschild-Couder Telescope (pSCT) has been inaugurated in .January 2019 at the Fred Lawrence Whipple Observatory aiming to the extension of the CTA array baseline. Silicon Photomultipliers (SiPMs) are particularly suitable as optical units of IACTs to detect the low- and fast-intensity Cherenkov signal. The Near UltraViolet High-Density 6 x 6 mm(2) SiPMs (NUV-HD3), produced by Fondazione Bruno Kessler in collaboration with INFN, have been assembled in more than 100 arrays of 16 pixels. These optical modules have been characterized in the laboratories of INFN to be integrated on the camera of pSCT. In this contribution we report the characterization results of the SiPM arrays and on the uniformity of their performances.

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