Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 95: Gravitational waves 1

T 95.8: Talk

Thursday, March 7, 2024, 17:45–18:00, Geb. 30.23: 6/1

Seismometer Position Optimization for Newtonian Noise Mitigation in the Einstein Telescope — •Patrick Schillings and Johannes Erdmann — III. Physikalisches Institut A, RWTH Aachen University

The Einstein Telescope is a third-generation gravitational wave detector that will allow us to measure gravitational waves with significantly improved precision. Its ’xylophone’ arrangement is designed to extend the frequency range down to a few Hertz. To improve the sensitivity of the low-frequency interferometer, one needs to mitigate the effect of density fluctuations in the surrounding rock caused by seismic activity, which result in so-called Newtonian noise in the detector. To achieve that, an array of seismometers will be installed around the mirrors. Expensive boreholes will have to be drilled in order to place these seismometers, which will limit the total number of seismometers that can be placed for a given budget. Therefore, the available resources should be used optimally in terms of predicting the Newtonain noise from the seismometer data. In this talk, I will focus on methods for the optimization of such an array.

Keywords: Einstein Telescope; gravitational wave; seismometer; optimization; Newtonian noise