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Simulation study for the proposed wide field-of-view gamma-ray detector array ALTO
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.ORCID iD: 0000-0002-7066-3614
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.ORCID iD: 0000-0002-2115-2930
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.ORCID iD: 0000-0002-4710-2165
2018 (English)In: Proceedings of Science: 35th International Cosmic Ray Conference, ICRC 2017, 10 -20 July 2017, Bexico, South Korea, Sissa Medialab Srl , 2018Conference paper, Published paper (Refereed)
Abstract [en]

ALTO is a wide field-of-view air shower detector array for very-high-energy (VHE) gamma-ray astronomy, proposed to be installed in the Southern Hemisphere at an altitude of ∼5.1 km above sea level. The array will use water Cherenkov detectors, as in the HAWC observatory, but combined with scintillator detectors, to detect air showers induced by VHE gamma rays in the atmosphere. It is being designed to attain a lower energy threshold, better energy and angular resolution, and improved sensitivity. The array will consist of ∼1250 small-sized (3.6 m diameter) detector units distributed over a circular area of ∼160 m in diameter. Each detector unit will consist of a water Cherenkov detector and a liquid scintillation detector underneath which will preferentially identify muons, facilitating the background (cosmic ray) rejection, thereby improving the sensitivity. The background rejection will be further enhanced by the close-packed arrangement and the small size of the detectors which will allow a fine sampling of air-shower footprints at the ground. In this contribution, we present the Monte-Carlo simulation of the experiment performed using CORSIKA and GEANT4 simulation packages. The expected performance of the array in terms of reconstruction accuracies of the shower core and arrival direction, as well as preliminary estimate of the trigger energy threshold after preliminary selection cuts for a point-like gamma-ray source are presented. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0).

Place, publisher, year, edition, pages
Sissa Medialab Srl , 2018.
Keywords [en]
Cerenkov counters, Cosmic rays, Cosmology, Intelligent systems, Monte Carlo methods, Particle detectors, Sea level, Background rejection, Close-packed arrangement, Gamma-ray astronomy, Gamma-ray detector arrays, Reconstruction accuracy, Scintillator detector, Southern Hemisphere, Water Cherenkov detectors, Gamma rays
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-84356DOI: 10.22323/1.301.0780Scopus ID: 2-s2.0-85046059785OAI: oai:DiVA.org:lnu-84356DiVA, id: diva2:1323077
Conference
35th International Cosmic Ray Conference, ICRC 2017, 10 -20 July 2017, Bexico, South Korea
Available from: 2019-06-11 Created: 2019-06-11 Last updated: 2019-06-13Bibliographically approved

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Thoudam, SatyendraBecherini, YvonnePunch, Michael

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