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 -- |
Author
Dr
Ernst-Jan Buis
(TNO)
Co-authors
Mr
Ed Doppenberg
(TNO)
Dr
Jan de Vreugd
(TNO)
Mr
Peter Toet
(TNO)
Dr
Robert Lahmann
(Erlangen Centre for Astroparticle Physicis)
