Japan Geoscience Union Meeting 2022

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[J] Poster

S (Solid Earth Sciences ) » S-GD Geodesy

[S-GD02] Geodesy and Global Geodetic Observing System

Wed. Jun 1, 2022 11:00 AM - 1:00 PM Online Poster Zoom Room (20) (Ch.20)

convener:Yusuke Yokota(Institute of Industrial Science, The University of Tokyo), convener:Yuta Mitsui(Department of Geosciences, Shizuoka University), Koji Matsuo(Geospatial Information Authority of Japan), Chairperson:Yusuke Yokota(Institute of Industrial Science, The University of Tokyo), Koji Matsuo(Geospatial Information Authority of Japan), Yuta Mitsui(Department of Geosciences, Shizuoka University)

11:00 AM - 1:00 PM

[SGD02-P01] Simulation of magnetic suspension in superconducting gravimeter by finite element method

*Yuichi Imanishi1, Akiteru Takamori1 (1.Earthquake Research Institute, The University of Tokyo)

Keywords:superconducting gravimeter, magnetic suspension, finite element method

The superconducting gravimeter (SG) is a gravimeter based on an operational principle utilizing magnetic levitation by superconductivity. Imanishi et al. (2018) investigated the effects of coupling between horizontal and vertical components for the SG (CT #036) installed at Ishigakijima, Japan, by using the data from a co-located seismometer. Imanishi et al. (2022) investigated the effects of vertical nonlinearity for the same instrument, by injecting artificial signals. To confirm these experimental results, in this study, we performed numerical simulation of magnetic suspension in the SG using the finite element method. The three-dimensional forces exerted on the levitating superconducting sphere were computed, from which the Taylor series coefficients of sphere’s potential were estimated. Results were in good agreement with the experimentally measured values for CT #036 in terms of signs and magnitude.