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  • The EUSO-SPB2 Fluorescence Telescope for the Detection of Ultra-High Energy Cosmic Rays
    Adams, James H; Allard, Denis; Alldredge, Phillip; Anchordoqui, Luis; Anzalone, Anna; Battisti, Matteo; Belov, Alexander A; Bertaina, Mario; Bertone, Peter F; Blin-Bondil, Sylvie; Burton, Julia; Cafagna, Francesco S; Casolino, Marco; Černý, Karel; Christ, Mark J; Colalillo, Roberta; Crawford, Hank J; Creusot, Alexandre; Cummings, Austin; Diesing, Rebecca; Alessandro Di Nola; Ebisuzaki, Toshikazu; Eser, Johannes; Ferrarese, Silvia; Filippatos, George; Finch, William W; Flaminio, Flavia; naro, Claudio; Fuehne, Duncan; Fuglesang, Christer; Garg, Diksha; Golzio, Alessio; Guarino, Fausto; Guépin, Claire; Heibges, Tobias; Judd, Eleanor G; Klimov, Pavel A; Krizmanic, John F; Kungel, Viktoria; Kupari, Luke; Kuznetsov, Evgeny; Manfrin, Massimiliano; Marszal, Wlodzimierz; Matthews, John N; Mese, Marco; Meyer, Stephan S; Mignone, Marco; Miyamoto, Hiroko; Murashov, Alexey S; Nachtman, Jane M; Olinto, Angela V; Onel, Yasar; Osteria, Giuseppe; Panico, Beatrice; Parizot, Ètienne; Paul, Tom; Pech, Miroslav; Perfetto, Francesco; Piotrowski, Lech W; Plebaniak, Zbigniew; Posliguaaa, Jonatan; Prévôtb, Guillaume; Przybylakae, Marika; Reardona, Patrick; Mary Hall Reno; Ricci, Marco; Sarazin, Fred; Schovánek, P; Scotti, Valentina; Shinozaki, Kenji; Soriano, Jorge F; Stillwell, Ben K; Szabelski, Jacek; Takizawa, Yoshiyuki; Trofimov, Daniil; Unel, Fredrik; Valore, Laura; Venters, Tonia M; Watts, John; Wiencke, Lawrence; Wistrand, Hannah; Young, Roy

    arXiv.org, 06/2024
    Paper, Journal Article

    The Extreme Universe Space Observatory on a Super Pressure Balloon 2 (EUSO-SPB2) flew on May 13\(^{\text{th}}\) and 14\(^{\text{th}}\) of 2023. Consisting of two novel optical telescopes, the payload utilized next-generation instrumentation for the observations of extensive air showers from near space. One instrument, the fluorescence telescope (FT) searched for Ultra-High Energy Cosmic Rays (UHECRs) by recording the atmosphere below the balloon in the near-UV with a 1~\(\mu\)s time resolution using 108 multi-anode photomultiplier tubes with a total of 6,912 channels. Validated by pre-flight measurements during a field campaign, the energy threshold was estimated around 2~EeV with an expected event rate of approximately 1 event per 10 hours of observation. Based on the limited time afloat, the expected number of UHECR observations throughout the flight is between 0 and 2. Consistent with this expectation, no UHECR candidate events have been found. The majority of events appear to be detector artifacts that were not rejected properly due to a shortened commissioning phase. Despite the earlier-than-expected termination of the flight, data were recorded which provide insights into the detectors stability in the near-space environment as well as the diffuse ultraviolet emissivity of the atmosphere, both of which are impactful to future experiments.

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