The Double Chooz experiment is the first of the next generation reactor experiments
searching for a non-vanishing value of the mixing angle θ13. The experimental
concept and detector design will be presented in this talk, together with a comparison with
the old Chooz experiment and the other reactor neutrino experiments currently under construction.
Operation of the far detector is expected to begin by the end of this year and the near detector will be installed in 2010.
With three years of data with both near and far detectors, Double Chooz has the capacity to measure
sin2(2θ13 ) if sin2(2θ13 ) > 0.05 or exclude sin2(2θ13 ) down to 0.03 at 90% for ∆m2 31 = 2.5 × 10−3 eV2.
