Abstract
With the KM3NeT experiment, which is presently under construction in the Mediterranean Sea, a new neutrino telescope will be installed to study both the neutrino properties as well as the cosmic origin of these particles. To do so, about 6000 optical modules will be installed in the abyss of the Mediterranean Sea to observe the Cherenkov radiation induced by high energy particle interactions in the deep sea. As each module of the KM3NeT telescope includes a piezo hydrophone, KM3NeT will also provide a unique matrix of underwater hydrophones. Results from the measurements show a well understood response of continuous signals, such as tones. In contrast, the response to transients signals exhibit a complex behavior with ringing and echo’s. Amplitude calibration measurements show a frequency dependent response which can be corrected for. Finally a system noise floor has been determined which amounts to 45 dB Re μPa2/Hz at 30 kHz.
Highlights
KM3NeT is designed to detect high-energy neutrino sources in the Universe as well as to determine the properties of neutrinos [1, 2]
These photo-multiplier tubes (PMTs) are housed in so-called digital optical modules (DOM), of which 18 are attached to long strings, called detection units
By deploying a large number of detection units, a large submerged 3D grid will be established with a total detection volume of about 1 km3, equiped with around 6000 optical modules
Summary
KM3NeT is designed to detect high-energy neutrino sources in the Universe as well as to determine the properties of neutrinos [1, 2]. Cherenkov radiation originating from neutrino induced particle showers is sensed using photo-multiplier tubes (PMTs). These PMTs are housed in so-called digital optical modules (DOM), of which 18 are attached to long strings, called detection units. Because each module includes a hydrophone it is interesting to assess the potential of KM3NeT in the acoustic detection of neutrinos [3]. To this end the piezo hydrophone in the DOM has been characterized and calibrated.
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