Abstract
The KM3NeT deep-sea neutrino telescope will use thousands of Digital Optical Modules (DOMs) forming a 3D array to detect the Cherenkov’s light produced by the particles generated after a neutrino interaction in the medium. The DOMs are arranged in Detection Units (DUs), structures anchored and maintained vertical by buoyancy each one containing 18 DOMs at different height. The DOMs are, thus, subject to movements due to sea currents. For a correct reconstruction of events detected by the telescope, it is necessary to monitor the position of each DOM with 10 cm accuracy. For this, an Acoustic Positioning System (APS) with a piezo-ceramic transducer installed in each DOM and a long baseline of acoustic transmitters and receivers on the seabed is used. Besides, there is a system of compass/accelerometers in the DOMs to determine their orientation. Then, a mechanical model is used to reconstruct the shape of the DU taking as input the information from the positioning sensors and using the sea current velocity as free parameter of the DU Line Fit method. The mechanical equations consider the buoyancy and the drag force of any item in the DU line. This work describes the data process of the different sensors and systems to obtain the fit shape of DUs, the situation for the first DUs installed as an example and to study the viability and define the full process to apply in KM3NeT.
Highlights
KM3NeT is an underwater detector of neutrinos, presently under development with the aim to perform neutrino astronomy and to determine the neutrino mass hierarchy [1]
Its philosophy is based on his predecessor ANTARES [2,3], arranging a 3D array of Digital Optical Modules (DOMs) in the Mediterranean Sea to detect the Cherenkov light produced by neutrino interactions in the water
DOMs are arranged in different Detection Units (DUs), flexible vertical structures anchored on the sea bed with 18 DOMs each one
Summary
KM3NeT is an underwater detector of neutrinos, presently under development with the aim to perform neutrino astronomy and to determine the neutrino mass hierarchy [1]. Its aim is to study high energy neutrions of cosmic origin It will be composed by two blocks of 115 DUs each distributed in. ORCA will have 115 DUs but in a more compact structure than ARCA (∼0.018 km3 ) One ARCA DU and four ORCA DUs are installed and operational. It is important to determine the orientation of the DOMs to locate which PMT is directly looking the path of the neutrino detected. Each DOM has an accelerometer and a compass This set up an Attitude and Heading Reference System (AHRS) in KM3NeT. The idea of this work is to reconstruct the shape of the DU using a mechanical model that uses an effective value of the sea current velocity and the inputs of the APS, AHRS data and mechanical properties of the DU components
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