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July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Design studies for a neutrino telescope based on optical fiber hydrophones

Jul 30, 2015, 3:30 PM
1h
Amazon Foyer Terrace (World Forum)

Amazon Foyer Terrace

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 288
Poster contribution NU-IN Poster 1 DM and NU

Speaker

Dr Ernst-Jan Buis (TNO)

Description

Acoustic detection may provide way to observe ultra-high energy cosmic neutrinos, i.e. energies above 10^18 eV, and their extra-galactic sources [1, 2]. The expected flux of cosmic neutrinos with ultra-high energy is low, so that large scale neutrino telescopes are needed for this emerging field of astroparticle physics. Using the acoustic signals induced by a neutrino interaction in water (or ice) has the advantage that sound can travel for many kilometers with only small attenuation in the relevant frequency range. A hydrophone network that uses the sea as a detection medium may therefore be the solution to detect the ultra-high energy neutrinos. It has been advocated that fiber optic hydrophone technology is a promising means to establish a sensitive, cost-effective and large scale sensor network [3]. In this technology several hydrophone sensors are integrated on a optical fiber. The sensors transform the acoustic pressure in to strain in the fiber. Subsequently, this strain causes a wavelength shift of the light that travels through the fiber and that is sensed using an interrogator. Hydrophones based on optical fibers, provide the required sensitivity to detect the small signals from neutrinos. At the same time, optical fibers form a cost-effective and straightforward way for the installation of a large scale network. In this talk we discuss the system design for a fiber optic hydrophone network. We provide a flow-down from the scientific objectives to the instrument requirements. This has led to the design of a new and improved hydrophone sensor. Measurements to characterize the sensor and to show its performance will be presented. In addition the performance of the interrogator is discussed and measurements are shown, leading to an overall performance prediction of the technology. [1] G. A. Askaryan. Acoustic recording of neutrinos. Zemlia i Vselennaia, 1:13–16, 1979. [2] J. G. Learned. Acoustic radiation by charged atomic particles in liquids: An analysis. Phys. Rev. D, 19:3293–3307, June 1979. [3] E. J. Buis et al. Fibre laser hydrophones for cosmic ray particle detection. Journal of Instrumentation, 9(03):C03051, 2014.
Registration number following "ICRC2015-I/" 454
Collaboration -- not specified --

Primary author

Co-authors

Mr Ed Doppenberg (TNO) Dr Jan de Vreugd (TNO) Mr Peter Toet (TNO) Dr Robert Lahmann (Erlangen Centre for Astroparticle Physicis)

Presentation materials

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