In resonant-mode atom-interferometer gravitational wave detectors, the optimal number of pulses is set mainly by per-pulse atom loss, and current large-pulse-number proposals demand fidelities roughly two orders of magnitude beyond the state of the art.
Technologies for the ELGAR large scale atom interferometer array
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abstract
We proposed the European Laboratory for Gravitation and Atom-interferometric Research (ELGAR), an array of atom gradiometers aimed at studying space-time and gravitation with the primary goal of observing gravitational waves (GWs) in the infrasound band with a peak strain sensitivity of $3.3 \times 10^{-22}/\sqrt{\text{Hz}}$ at 1.7 Hz. In this paper we detail the main technological bricks of this large scale detector and emphasis the research pathways to be conducted for its realization. We discuss the site options, atom optics, and source requirements needed to reach the target sensitivity. We then discuss required seismic isolation techniques, Gravity Gradient Noise reduction strategies, and the metrology of various noise couplings to the detector.
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Spatial and Pulse Efficiency Constraints in Atom Interferometric Gravitational Wave Detectors
In resonant-mode atom-interferometer gravitational wave detectors, the optimal number of pulses is set mainly by per-pulse atom loss, and current large-pulse-number proposals demand fidelities roughly two orders of magnitude beyond the state of the art.