Abstract
The detection of gravitational waves (GW) with interferometric detectors is expected to take place within at most one year after the second generation of GW detectors, advanced LIGO and advanced Virgo, come close to their design sensitivity. While the sensitivity of these second generation detectors will be good enough to observe signals with a high Signal-to-Noise ratio at rates of a few per year at best, routine GW astronomy, which is the goal for the following generation, requires more sensitive instruments. In a European-wide effort a conceptual design study (http://www.etgw.eu/) for such a third generation GW observatory has been started in Summer 2008. The goal for the Einstein Telescope (ET) is an improvement in sensitivity by a factor of 10, with respect to the advanced detectors, and the possibility to access the 1-10 Hz frequency range, still inaccessible for the 2nd generation.
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