MAGIS-100 Environmental Noise and Gravity Gradient Noise

To inform research and development for the design and commissioning of the MAGIS-100 atom interferometer at Fermilab a through understanding of the noise sources associated with the environment is required. Considerations of temperature, humidity, and vibration fluctuations arise when moving from the controlled environment of a laboratory to an underground access shaft. To better understand these effects we surveyed the environment measuring the temperature above and below ground as well as measuring and analyzing the vibration spectrum of the installation site. We also studied the seismic vibration effect of gravity gradient noise -- a limiting noise source for our science goals of ultralight scalar dark matter searches and gravitational wave measurements -- which was modeled using input from a low-noise seismometer at multiple locations, and devised a potential mitigation scheme studied through stocastic simulation.