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The recent discovery by the IceCube collaboration of a high-energy neutrino flux of extraterrestrial origin has opened a new observational window on the Universe. However, unambiguous identification of the emitting neutrino sources will require next generation neutrino telescopes with full sky coverage. The KM3NeT Collaboration aims at building a research infrastructure in the depths of the Mediterranean Sea hosting a multi-cubic-kilometre neutrino telescope. The technology for the detector construction and operation is defined and under final test with prototypes at depths of 2500 m and 3500 m. The detector array of optical modules will be subdivided into sizeable building blocks of string-type detection units. This intrinsically modular nature of the detector allows for a staged implementation with increasing size from about 0.1 km3 for highenergy astronomy (phase-1) to be completed by 2016 to a volume of several km3 in the final phase. The following phase, KM3NeT 2.0, will comprise two detectors with different granularity of optical modules: KM3NeT/ARCA at the KM3NeT-It site offshore Capo Passero (Italy) with two building blocks dedicated to high-energy neutrino astronomy and KM3NeT/ORCA, a single building block located at the KM3NeT-Fr site offshore Toulon (France) dedicated to the study of neutrino mass hierarchy. The latitude of KM3NeT/ARCA will allow for a wide coverage of the observable sky including the region of the galactic centre. Owing to the favourable characteristics of sea water the direction of neutrinos will be measured with excellent angular resolution also for cascade events. The expected KM3NeT/ARCA sensitivity will allow for the detection of the reported IceCube flux within less than one year of observation, providing new insight on its origin, energy spectrum and flavour composition. Within five years of observation KM3NeT/ARCA could give indications at 3σ level on various galactic point-like sources.

All-flavour high-energy neutrino astronomy with KM3NeT/ARCA