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2 results on '"GRAVITATIONAL wave detectors"'

1. Cold-atom sources for the Matter-wave laser Interferometric Gravitation Antenna (MIGA).

Author

Beaufils, Quentin, Sidorenkov, Leonid A., Lebegue, Pierre, Venon, Bertrand, Holleville, David, Volodimer, Laurent, Lours, Michel, Junca, Joseph, Zou, Xinhao, Bertoldi, Andrea, Prevedelli, Marco, Sabulsky, Dylan O., Bouyer, Philippe, Landragin, Arnaud, Canuel, Benjamin, and Geiger, Remi

Subjects
*GRAVITATIONAL wave detectors, *ANTENNAS (Electronics), *LASER measurement, *GRAVITATION, *LASER interferometry, *GRAVIMETRY, *SYNTHETIC aperture radar
Abstract

The Matter-wave laser Interferometric Gravitation Antenna (MIGA) is an underground instrument using cold-atom interferometry to perform precision measurements of gravity gradients and strains. Following its installation at the low noise underground laboratory LSBB in the South-East of France, it will serve as a prototype for gravitational wave detectors with a horizontal baseline of 150 meters. Three spatially separated cold-atom interferometers will be driven by two common counter-propagating lasers to perform a measurement of the gravity gradient along this baseline. This article presents the cold-atom sources of MIGA, focusing on the design choices, the realization of the systems, the performances and the integration within the MIGA instrument. [ABSTRACT FROM AUTHOR]

Published
2022
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2. Characterizing Earth gravity field fluctuations with the MIGA antenna for future gravitational wave detectors.

Author

Junca, J., Bertoldi, A., Sabulsky, D. O., Lefèvre, G., Zou, X., Decitre, J.-B., Geiger, R., Landragin, A., Gaffet, S., Bouyer, P., and Canuel, B.

Subjects
*GRAVITATIONAL wave detectors, *GRAVITATIONAL waves, *GRAVITATIONAL fields, *GRAVITY, *GRAVIMETRY, *ANTENNAS (Electronics)
Abstract

Fluctuations of the Earth's gravitational field are a major noise source for ground-based experiments investigating general-relativistic phenomena such as gravitational waves (GWs). Mass density variations caused by local seismic or atmospheric perturbations determine spurious differential displacements of the free-falling test masses--called gravity gradient noise (GGN)--which mimics GW effects. This GGN is expected to become dominant in the infrasound domain and must be tackled for the future realization of observatories exploring GWs at low frequency. GGN will be studied with the MIGA experiment, a demonstrator for low-frequency GW detection based on atom interferometry currently being constructed at the low-noise underground Laboratoire Souterrain à Bas Bruit (LSBB) in France. MIGA will provide precise measurements of local gravity, probed by a network of three free-falling atom test masses separated by up to 150 m. We model the effect of GGN for MIGA and use seismic and atmospheric data recorded at LSBB to characterize their impact on future measurements. We show that the antenna will be able to characterize GGN using dedicated data analysis methods. [ABSTRACT FROM AUTHOR]

Published
2019
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