The ASTRI Mini-Array at Teide Observatory

Antonelli, L. A.

doi:10.22323/1.395.0897

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…The telescope structure and its optics system have been chosen for the small-sized telescopes to be installed at the Cherenkov Telescope Array (CTA) [9] southern site. At the same time, the complete ASTRI-Horn is the prototype of the nine telescopes that form the ASTRI Mini-Array [10] under construction at the Teide Observatory, Canary Islands, Spain, that will be able to study bright sources (∼ 10 −12 erg cms −2 s −1 at 10 TeV) with an angular resolution of ∼ 3 ′ and an energy resolution of ∼ 10% at an energy of about 10 TeV [11,16].…”

Section: The Astri-hornmentioning

confidence: 99%

Gain variations as induced by the diffuse night sky background: the ASTRI-Horn experience

Impiombato,

Compagnino,

Mineo

et al. 2024

J. Inst.

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ASTRI-Horn is the prototype of the nine telescopes that form the ASTRI Mini-Array, under construction at the Teide Observatory in Tenerife (Spain), devoted to observe the sky in the 1–200 TeV energy band. It adopts an innovative optical design based on a dual-mirror Schwarzschild-Couder configuration, and the camera, composed by a matrix of monolithic multipixel silicon photomultipliers (SiPMs) is managed by ad-hoc tailored front-end electronics based on a peak-detector operation mode. During the Crab Nebula campaign in 2018–2019, ASTRI-Horn was affected by gain variations induced by high levels of night sky background. This paper reports the work performed to detect and quantify the effects of these gain variations in shower images. The analysis requested the use of simultaneous observations of the night sky background flux in the wavelength band 300–650 nm performed with the auxiliary instrument UVscope, a calibrated multi-anode photomultiplier working in single counting mode. As results, a maximum gain reduction of 15% was observed, in agreement with the value previously computed from the variance of the night sky background level in each image. This ASTRI-Horn gain reduction was caused by current limitation of the voltage supply. The analysis presented in this paper provides a method to evaluate possible variations in the nominal response of SiPMs when scientific observations are performed in the presence of high night sky background as in moon conditions.

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Section: The Astri-hornmentioning

confidence: 99%

Gain variations as induced by the diffuse night sky background: the ASTRI-Horn experience

Impiombato,

Compagnino,

Mineo

et al. 2024

J. Inst.

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“…The ASTRI MA will be operated by INAF based on a host agreement with IAC. 14,15 In addition, the ASTRI Collaboration is participating to the preparatory effort for the realization of the Cherenkov Telescope Array (CTA). It will be located in two different sites, one in the northern and one in the southern hemisphere, and will be made up of three different types of IACTs.…”

Section: Introductionmentioning

confidence: 99%

Mirror production for the Cherenkov telescopes of the ASTRI mini-array and the MST project for the Cherenkov Telescope Array

Palombara

Sironi

Giro

et al. 2022

J. Astron. Telesc. Instrum. Syst.

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The Cherenkov Telescope Array (CTA) is the next ground-based gamma-ray observatory in the TeV γ-ray spectral region operating with the Imaging Atmospheric Cherenkov Technique. It is based on almost 70 telescopes of different class diameters-Large-Sized Telescope, Medium-Sized Telescope (MST), and Small-Sized Telescope (SST) of 23, 12, and 4 m, respectively-to be installed in two sites in the two hemispheres (at La Palma, Canary Islands, and near Paranal, Chile). Several thousands of reflecting mirror tiles larger than 1 m 2 will be produced for realizing the segmented primary mirrors of a so large number of telescopes. Almost in parallel, the ASTRI mini-array (MA) is being implemented in Tenerife (Canary Islands), composed of nine 4-m diameter dual-mirror Cherenkov telescopes (very similar to the SSTs). We completed the mirror production for all nine telescopes of the ASTRI MA and two MSTs (400 segments in total) using the cold glass slumping replication technology. The results related to the quality achieved with a large-scale production are presented, also discussing the adopted testing methods and approaches. They will be very useful for the adoption and optimization of the quality assurance process for the huge production (almost 3000 m 2 of reflecting surface) of the MST and SST CTA telescopes. © The Authors.Published by SPIE under a Creative Commons Attribution 4.0 International License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…The telescope structure and its optics system have been chosen for the small-sized telescopes to be installed at the CTA southern site. At the same time, the complete ASTRI-Horn is the prototype of the nine telescopes that form the ASTRI Mini-Array [9] under construction at the Teide Observatory, Canary Islands, Spain, that will be able to study bright sources (∼10 −12 erg cms −2 s −1 at 10 TeV) with an angular resolution of ∼3' and an energy resolution of ∼10% at an energy of about 10 TeV [10].…”

Section: Introductionmentioning

confidence: 99%

Gain variations as induced by the diffuse night sky background: the ASTRI-Horn experience

Impiombato

Compagnino

Mineo

et al. 2022

Preprint

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ASTRI-Horn is the prototype of the nine telescopes that form the ASTRI Mini-Array, under construction at the Teide Observatory in Spain, devoted to observe the sky above 10 TeV. It adopts an innovative optical design based on a dual-mirror Schwarzschild-Couder configuration, and the camera, composed by a matrix of monolithic multipixel silicon photomultipliers (SiPMs) is managed by ad-hoc tailored front-end electronics based on a peak-detector operation mode. During the Crab Nebula campaign in 2018-2019, ASTRI-Horn was affected by gain variations induced by high levels of night sky background. This paper reports the work performed to detect and quantify the effects of these gain variations in shower images. The analysis requested the use of simultaneous observations of the night sky background flux in the wavelength band 300-650 nm performed with the auxiliary instrument UVscope, a calibrated multi-anode photomultiplier working in single counting mode. As results, a maximum gain reduction of 15% was obtained, in agreement with the value previously computed from the variance of the background level in each image. This ASTRI-Horn gain reduction was caused by current limitation of the voltage supply. The analysis presented in this paper provides a method to evaluate possible variations in the nominal response of SiPMs when scientific observations are performed in the presence of high night sky background as in dark or gray conditions.

show abstract

The ASTRI Mini-Array at Teide Observatory

Cited by 7 publications

References 10 publications

Gain variations as induced by the diffuse night sky background: the ASTRI-Horn experience

Gain variations as induced by the diffuse night sky background: the ASTRI-Horn experience

Mirror production for the Cherenkov telescopes of the ASTRI mini-array and the MST project for the Cherenkov Telescope Array

Gain variations as induced by the diffuse night sky background: the ASTRI-Horn experience

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