PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Gamma-ray Astronomy (GA)
Calibration strategy of the ASTRI Mini-Array Cherenkov cameras
D. Mollica*, O. Catalano, G. Contino, M. Capalbi, M. Corpora, F.P. Lo Gerfo, P. Sangiorgi, G. Sottile, S. Iovenitti, G. Leto, T. Mineo, S. Scuderi, G. Tosti and G. Pareschi
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Pre-published on: July 25, 2023
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Abstract
The ASTRI Mini-Array is an international project led by the Italian National Institute for Astrophysics (INAF) to deploy an array of nine Imaging Atmospheric Cherenkov Telescopes at the Teide Observatory in Tenerife. The system will study astronomical sources emitting at very high-energy above 1 TeV. The telescopes are an improved version of the ASTRI-Horn telescope (Mt. Etna, Italy), a 4-m diameter prototype developed by INAF in the context of the ASTRI Project.

The novel Mini-Array Cherenkov camera, based on Silicon Photo-Multiplier (SiPM) detectors, is an evolution of the ASTRI-Horn telescope camera. The camera focal plane is equipped with 2368 SiPM pixels with dimensions of 7 mm x 7 mm arranged in tiles of 8 x 8 pixels. Each tile together with the ASIC board and the FPGA board constitutes a Photon Detection Module (PDM). 37 PDMs are arranged to match the spherical profile of the focal surface.

In this contribution we present the camera calibration strategy and tools developed thanks to the experience gained with the ASTRI-Horn telescope. These calibration procedures are essential tasks to extract SiPMs calibration coefficients, which are needed for the Cherenkov data analysis, and camera configuration parameters that ensure system stability and a uniform trigger efficiency over the whole telescope field of view. Moreover, these procedures allow to monitor the system performance and health during the data taking.
DOI: https://doi.org/10.22323/1.444.0765
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