Optical lattice transport tools for ultracold atoms over a 100 m baseline*

We present a novel optical lattice design to transfer ultracold Sr atoms horizontally over 60 cm, and subsequently accelerate them vertically to a few 10 m/s. This is crucial for achieving several seconds of free fall time in the 100-meter-long Matter-wave Atomic Gradiometer Interferometric Sensor (MAGIS-100). The proposed horizontal transfer uses two optical lattices to launch and catch the atoms. Gravitational sag is mitigated by a small angle in both lattices. The proposed vertical acceleration uses an optical lattice formed by two near-vertical beams intersecting at a shallow angle. Both horizontal and vertical lattice systems are miniaturized and delivered from compact modules to improve thermal and vibrational stability.