2025_programme: The KM3NeT Acoustic Positioning system: the KM3NeT-ARCA case

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  • Day: June 16, Monday
      Location / Time: A. TERPSIHORI at 17:20-17:40
  • Last minutes changes: -
  • Session: 03. Advances in acoustic measurement systems: Technologies and applications
    Organiser(s): Alessandra Tesei, Matthew Schinault, Purnima Ratilal
    Chairperson(s): Matthew Schinault
  • Lecture: The KM3NeT Acoustic Positioning system: the KM3NeT-ARCA case [Invited]
    Paper ID: 2222
    Author(s): Giorgio Riccobene, Salvatore Viola, Didac Diego-Tortosa, Letizia Di Mauro, km3net Collaboration
    Presenter: Giorgio Riccobene
    Abstract: KM3NeT is an underwater high-energy neutrino telescope, using the water-Cherenkov technique to reconstruct neutrino originated events in seawater. \nThe telescope consists of two detectors located offshore Toulon, France, at 2500 m water depth (ORCA, Oscillation Research with Cosmics in the Abyss) and offshore Capo Passero, Italy, at 3500 m water depth (ARCA, Astronomy Research with Cosmics in the Abyss). \nBoth detectors require accurate time (1 ns) and position (20 cm) resolution to fully exploit the event reconstruction capabilities of multi-PMT optical modules, to measure neutrino energy and direction. \nA custom acoustic positioning system (APS) was designed and developed by the KM3NeT collaboration, to obtain the requested accuracy.\nThis system, the largest and most accurate deep-sea positioning system worldwide, exploits the KM3NeT detector’s precise time synchronization system based on White Rabbit to operate a phased array of several thousand digital acoustic receivers installed on each optical module to constantly monitor the position and movements of the detector elements, subject to underwater currents. A long baseline of active and passive acoustic elements is installed on the seafloor to provide geo-reference to the telescope. \nAcoustic data are continuously sampled at 193.5 kHz and streamed to shore, for analysis.\nTime of flight of acoustic signals is used to measure the distance between APS elements. \nIn this contribution we will present results and performances of the system based on position and orientation reconstruction of optical modules obtained via multi-lateration.\n
  • Corresponding author: Dr Giorgio Riccobene
    Affiliation: INFN-LNS
    Country: Italy

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