The predictions of the cosmogenic-neutrino flux at $10^9$ GeV
depend on the composition of the primary flux of cosmic-rays above $10^{10}$
GeV, which is a long standig question. It is, therefore, no surprise that the hunt to detect the first cosmogenic
neutrino is a hot topic in astroparticle physics. But pushing the experimental
sensitivity into the predicted flux region is a challenge. A major obstacle is
to obtain a large enough acceptance while keeping costs of experiments at
reasonable levels. I have performed a conceptual design study of a dedicated
array of Cherenkov telescopes that uses the Earth skimming technique to detect
tau neutrinos. The studies show that a fairly small Cherenkov telescope system
is sufficient to reach sensitivities that are competitive with other proposed
neutrino experiments in the same energy range, like ARA and ARIANNA, and outperforms
them in terms of costs. In this talk I present details of the design study and
discuss the proposed array of Cherenkov telescopes, which I named Trinity. |