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Progress towards stereo observation of ultra-high-energy cosmic rays with Fluorescence detector Array of Single-pixel Telescopes

Year: 2025
Type: conference-paper
Abstract: Ultra-high-energy cosmic rays (UHECRs) are the most energetic particles ever detected. Cosmic rays that achieve the highest energies are rare, and their flux at Earth is extremely low. As a result, next-generation experiments with large effective areas are required and under development. The Fluorescence detector Array of Single-pixel Telescopes (FAST) is one such project. Although observation time is limited compared with ground particle detectors, it enables direct measurements of $X_\mathrm{max}$, a crucial parameter sensitive to the primary cosmic-ray composition. FAST will achieve large-area coverage by significantly reducing the cost of telescopes. This necessitates a simplified telescope compared to conventional designs. Demonstrating the feasibility of our telescope and observational method is essential. To validate the FAST concept, prototype telescopes have been deployed at the Pierre Auger Observatory and the Telescope Array experiment.
DOI: 10.22323/1.501.0380
Authors: Shunsuke Sakurai, Justin Albury, Jose Bellido, Fraser Bradfield, Karel Cerny, Ladislav Chytka, John Farmer, Toshihiro Fujii, Petr Hamal, Pavel Horvath, Miroslav Hrabovsky, Vlastimil Jilek, Jakub Kmec, Jiri Kvita, Max Malacari, Dusan Mandat, Massimo Mastrodicasa, John N. Matthews, Stanislav Michal, Hiromu Nagasawa, Hiroki Namba, Marcus Niechciol, Libor Nozka, Miroslav Palatka, Miroslav Pech, Paolo Privitera, Francesco Salamida, Petr Schovanek, Radomir Smida, Daniel Staník, Zuzana Svozilikova, Akimichi Taketa, Kenta Terauchi, Stan Thomas, Petr Travnicek, Martin Vacula
Language: English
Open Access status: hybrid
Funders: National Science Foundation, University of Chicago, Grantová Agentura České Republiky, Akademie Věd České Republiky, Japan Society for the Promotion of Science, Institute for Cosmic Ray Research, University of Tokyo
Awards: G12500569, G2678520069, The Highest Energy Astroparticle Physics, Pioneering ultrahigh-energy cosmic ray astronomy using new air-fluorescence telescope array, G4131035492, Physics Frontier Center at the Kavli Institute for Cosmological Physics: Pushing Cosmology to the Edge, G6155511183, The Highest Energy Astroparticle Physics, Cross calibration of ultra-high-energy cosmic ray observatories using new air-fluorescence telescopes, G884207649
OpenAlex ID: W4414478473
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