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Technologies for the ELGAR large scale atom interferometer array

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arxiv 2007.04014 v1 pith:UBAUYW2M submitted 2020-07-08 physics.atom-ph

Technologies for the ELGAR large scale atom interferometer array

classification physics.atom-ph
keywords atomarraydetectordiscusselgargravitationlargenoise
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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