Optimal placement of two stations in an isotropic Gaussian seismic field reduces equivalent seismic noise ASD by a factor of ~2.3 at 0.3 Hz versus a single station, producing oscillatory features from Bessel-function correlations.
Towards a first design of a Newtonian-noise cancellation system for Advanced LIGO
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abstract
Newtonian gravitational noise from seismic fields is predicted to be a limiting noise source at low frequency for second generation gravitational-wave detectors. Mitigation of this noise will be achieved by Wiener filtering using arrays of seismometers deployed in the vicinity of all test masses. In this work, we present optimized configurations of seismometer arrays using a variety of simplified models of the seismic field based on seismic observations at LIGO Hanford. The model that best fits the seismic measurements leads to noise reduction limited predominantly by seismometer self-noise. A first simplified design of seismic arrays for Newtonian-noise cancellation at the LIGO sites is presented, which suggests that it will be sufficient to monitor surface displacement inside the buildings.
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A vertical long-wire suspended gradiometer configuration amplifies gravitational wave signals from order h to order h L/D by separating gravitational force from moment of inertia.
Extends prior two-photon formalism to compute true motion and optimal cooling in multi-DOF GW detector test masses, finding sub-unity occupation numbers possible over the oscillator bandwidth for common definitions.
citing papers explorer
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Seismic background mitigation with the Lunar Gravitational-wave Antenna
Optimal placement of two stations in an isotropic Gaussian seismic field reduces equivalent seismic noise ASD by a factor of ~2.3 at 0.3 Hz versus a single station, producing oscillatory features from Bessel-function correlations.
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Mechanical Long Baseline Differential Gradiometers as Low Frequency Gravitational Wave Detectors
A vertical long-wire suspended gradiometer configuration amplifies gravitational wave signals from order h to order h L/D by separating gravitational force from moment of inertia.
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True and apparent motion of optomechanical resonators, with applications to feedback cooling of gravitational wave detector test masses
Extends prior two-photon formalism to compute true motion and optimal cooling in multi-DOF GW detector test masses, finding sub-unity occupation numbers possible over the oscillator bandwidth for common definitions.