Passive Newtonian noise suppression for gravitational-wave observatories based on shaping of the local topography
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Publication:2924823
DOI10.1088/0264-9381/31/18/185011zbMATH Open1300.83017arXiv1406.2253OpenAlexW3106435019WikidataQ59450866 ScholiaQ59450866MaRDI QIDQ2924823
Author name not available (Why is that?)
Publication date: 17 October 2014
Published in: (Search for Journal in Brave)
Abstract: In this article we propose a new method for reducing Newtonian noise in laser-interferometric gravitational-wave detectors located on the Earth's surface. We show that by excavating meter-scale recesses in the ground around the main test masses of a gravitational wave detector it is possible to reduce the coupling of Rayleigh wave driven seismic disturbances to test mass displacement. A discussion of the optimal recess shape is given and we use finite element simulations to derive the scaling of the Newtonian noise suppression with the parameters of the recess as well as the frequency of the seismic excitation. Considering an interferometer similar to an Advance LIGO configuration, our simulations indicate a frequency dependent Newtonian noise suppression factor of 2 to 4 in the relevant frequency range for a recesses of 4m depth and a width and length of 11m and 5m, respectively. Though a retrofit to existing interferometers seems not impossible, the application of our concept to future infrastructures seems to provide a better benefit/cost ratio and therefore a higher feasibility.
Full work available at URL: https://arxiv.org/abs/1406.2253
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