Large-area atom interferometry in a 10 m atomic fountain

Light-pulse atom-interferometer sensitivity scales with the spacetime area enclosed by the interferometer, motivating operation with larger momentum separation and longer interrogation times. In practice, these regimes introduce contrast loss from inhomogeneous dephasing due to spatially varying forces and optical wavefront or intensity imperfections across the atomic ensemble, as well as reduced signal from imperfect momentum transfer, scattering, and detection noise. We present recent progress and experimental results from atom interferometry in a 10 m atomic fountain with ultracold Rb ensembles, including upgrades to the atomic source preparation, atom optics beams and delivery, and pulse sequences.