Abstract

In this work, we present a prototype of a compact linear array with three elements that is able to reproduce the acoustic signature of Ultra High Energy (UHE) neutrino interaction in water using the parametric acoustic effect. Mimicking this signal is important because it is a very directive bipolar transient signal with cylindrical symmetry. We characterized the prototype by measuring the signal waveform, the attenuation, intensity variation and directivity, with numerical simulations and experimentally in a pool. We also studied different kinds of signals to determine the best application for the array. The results confirmed the utility of this array for the proposed application in marine neutrino telescopes.

Highlights

  • Several decades ago, the acoustic technique was proposed for the detection of ultra high energy (UHE) neutrinos [1]

  • This paper describes the design of the emitter array based on simulations and it presents the first experimental results to characterize the array

  • The design of the array begun with the study of a single element to select the type of transmitter

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Summary

Introduction

The acoustic technique was proposed for the detection of ultra high energy (UHE) neutrinos [1]. When there is a UHE neutrino interaction in water, a shower of particles is produced, so its energy is released in a small cylindrical-like volume, which is a few centimeters in radius and several meters in length. This local heating, which is almost instantaneous leads to a short pressure pulse signal, with a bipolar shape in time and a very directive pattern (pancake-like), being emitted perpendicularly to the shower axis. The feasibility of the technique is still under discussion and several experiments and tools have been proposed to test it [2,3,4] This technique could be implemented in the KM3NeT telescope, which is a new optical-based deep-sea neutrino telescope that is under construction with a volume of several cubic kilometers. The fact that this facility has to integrate hundreds of acoustic sensors in the acoustic positioning system for calibration purposes, triggers the idea of using the sensors for acoustic detection of neutrinos as well

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