Speaker
Description
The Einstein Telescope was conceived as the ultimate terrestrial GW observatory located underground to provide the quietest possible geophysical environment. A set of revolutionary technologies is needed to make full use of these quiet conditions. One of the important consequences is that the single-interferometer configuration must be abandoned by introducing the concept of the xylophone with a low-frequency, and a high-frequency interferometer. We are therefore facing the daunting task of providing the final technical design of two highly-sophisticated, and technology-wise very different interferometers in the next 10 years. I will summarize the status of the effort, the main challenges we are facing today, and how we might be able to meet the timeline.