A Gravimetric Support Network for Very Long Baseline Atom Interferometry

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Schilling, M. et al.: A Gravimetric Support Network for Very Long Baseline Atom Interferometry. Poster, AGU Fall Meeting, 9-13 Dezember 2019, San Francisco, USA

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With the introduction of portable atom interferometers (AI), a genuinely independent method for the determination of g is available for the first time since the introduction of laser interferometer based instruments. Current AIs offer several advantages and already reach the accuracy of classical sensors. Additionally, a small number of stationary experiments were implemented for research in fundamental physics and geodesy. These instruments, extending the free fall distance of atoms to several meters, allow for longer evolution times of the wave function, thereby increasing the sensitivity of the AI compared to decimetres in portable devices. The construction of an AI with a 9 m interaction zone is currently being completed at Leibniz University Hannover.The knowledge of g and its gradient is required for the evaluation of systematic effects and uncertainties in AI experiments. Therefore, a gravimetric control network connected to one absolute gravimeter pier was established and repeatedly observed during the construction of the Very Long Baseline Atom Interferometry facility (VLBAI). Before the installation of the instrument, this network included the central axis of the VLBAI and one vertical off-axis parallel profile. The latter profile can also be observed during operation of the VLBAI. The effect of local gravity changes, e. g., hydrology, is comparable to 1 nm/s² on both axes. The gravimetric measurements serve as a reference during initial tests of the VLBAI. Repeated observations in the future will be used to characterize the effect of local hydrology and other mass variations along the vertical axis. A model of the research building and groundwater level monitoring supplements the gravimetric network. As the VLBAI is capable of measuring g and its vertical gradient with higher accuracy (<1 nm/s²) than classical instruments, the model will be used to transfer g to a gravimetry laboratory for gravimeter comparisons.We present our strategy for gravimetric control of the VLBAI. This will provide a reference at first and will later be used to establish the VLBAI as a reference for gravimeter comparisons. The results of the first gravimetric campaigns and the comparison with the model of the VLBAI environment show an agreement within the instrumental uncertainties of the relative gravimeters used.
License of this version: CC BY 3.0 DE
Document Type: conferenceObject
Publishing status: publishedVersion
Issue Date: 2019
Appears in Collections:Fakultät für Bauingenieurwesen und Geodäsie

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1 image of flag of Germany Germany 52 42.62%
2 image of flag of New Zealand New Zealand 18 14.75%
3 image of flag of United States United States 17 13.93%
4 image of flag of China China 13 10.66%
5 image of flag of Nepal Nepal 3 2.46%
6 image of flag of Israel Israel 3 2.46%
7 image of flag of Switzerland Switzerland 3 2.46%
8 image of flag of Sweden Sweden 2 1.64%
9 image of flag of Finland Finland 2 1.64%
10 image of flag of Belgium Belgium 2 1.64%
    other countries 7 5.74%

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