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The EUSO-SPB2 fluorescence telescope for the detection of Ultra-High Energy Cosmic Rays
University of Alabama in Huntsville, 301 Sparkman Dr NW, Huntsville, AL, 35899, United States of America, 301 Sparkman Dr NW.
KTH, School of Engineering Sciences (SCI), Physics, Particle Physics, Astrophysics and Medical Imaging.ORCID iD: 0000-0002-0406-0962
KTH, School of Engineering Sciences (SCI), Physics, Particle Physics, Astrophysics and Medical Imaging.
NASA Marshall Space Flight Center, Martin Rd SW, Huntsville, AL, 35808, United States of America, Martin Rd SW.
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Number of Authors: 822025 (English)In: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 165, article id 103046Article in journal (Refereed) Published
Abstract [en]

The Extreme Universe Space Observatory on a Super Pressure Balloon 2 (EUSO-SPB2) flew on May 13th and 14th 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 1μs time resolution using 108 multi-anode photomultiplier tubes with a total of 6912 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 h 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.

Place, publisher, year, edition, pages
Elsevier BV , 2025. Vol. 165, article id 103046
Keywords [en]
Cosmic ray, Fluorescence, Super pressure balloon, UHECR, Ultraviolet
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-354292DOI: 10.1016/j.astropartphys.2024.103046ISI: 001333323500001Scopus ID: 2-s2.0-85204440060OAI: oai:DiVA.org:kth-354292DiVA, id: diva2:1902950
Note

QC 20241030

Available from: 2024-10-02 Created: 2024-10-02 Last updated: 2025-01-17Bibliographically approved

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Fuglesang, Christer

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