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By utilizing the quadratic dependency of the interferometry phase on time,the Hannover Very Long Baseline Atom Interferometer facility (VLBAI) aims forsub nm/s$^2$ gravity measurement sensitivity. With its 10 m vertical baseline,VLBAI offers promising prospects in testing fundamental physics at theinterface between quantum mechanics and general relativity. Here we discuss thechallenges imposed on controlling VLBAI's magnetic and gravitationalenvironment and report on their effect on the device's accuracy. Within theinner 8 m of the magnetic shield, residual magnetic field gradients expect tocause a bias acceleration of only 6$\times$10$^{-14}$ m/s$^2$ while we evaluatethe bias shift due to the facility's non-linear gravity gradient to 2.6nm/s$^2$. The model allows the VLBAI facility to be a reference to other mobiledevices for calibration purposes with an uncertainty below the 10 nm/s$^2$level.

Understanding the gravitational and magnetic environment of a very long baseline atom interferometer