Newtonian-noise cancellation in large-scale interferometric GW detectors using seismic tiltmeters

作者：Harms Jan; Venkateswara Krishna

来源：Classical and Quantum Gravity, 2016, 33(23): 234001.

DOI：10.1088/0264-9381/33/23/234001

• Newtonian noise
• tiltmeter
• gravitational-wave detection

The mitigation of terrestrial gravity noise, also known as Newtonian noise (NN), is one of the foremost challenges to improve low-frequency sensitivity of ground-based gravitational-wave detectors. At frequencies above 1 Hz, it is predicted that gravity noise from seismic surface Rayleigh waves is the dominant contribution to NN in surface detectors, and may still contribute significantly in future underground detectors. Noise cancellation based on a coherent estimate of NN using data from a seismometer array was proposed in the past. In this article, we propose an alternative scheme to cancel NN using a seismic tiltmeter. It is shown that even under pessimistic assumptions concerning the complexity of the seismic field, a single tiltmeter under each test mass of the detector is sufficient to achieve substantial noise cancellation. A technical tiltmeter design is presented to achieve the required sensitivity in the Newtonian-noise frequency band.

• 出版日期2016-12-8