Speaker
Description
The Einstein Telescope aims to detect gravitational waves with unprecedented low-frequency sensitivity. In this regime, Newtonian Noise (NN) from seismic density fluctuations in the surrounding rock becomes a dominant limitation. While NN mitigation classically relies on arrays of seismometers measuring translational seismic motion, rotational motion carries complementary information that could improve NN prediction. Large ring laser interferometers, based on the Sagnac effect, measure this rotational information which is, for example, used to determine length-of-day variations of the Earth's rotation. This poster explores the implementation of such a Sagnac interferometer into a corner of the ET infrastructure where it would naturally benefit from the cavern's large dimensions, raising the sensitivity by up to two orders of magnitude compared to current state-of-the-art detectors.