Sensitive Superconducting Gravity Gradiometer Constructed with Levitated Test Masses

C. E. Griggs; M. V. Moody; R. S. Norton; H. J. Paik; K. Venkateswara

doi:10.1103/PhysRevApplied.8.064024

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Sensitive Superconducting Gravity Gradiometer Constructed with Levitated Test Masses

C. E. Griggs, M. V. Moody, R. S. Norton, H. J. Paik, K. Venkateswara

DOI 10.1103/PhysRevApplied.8.064024 · Physical Review Applied

T1

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Abstract

We demonstrate basic operations of a two-component superconducting gravity gradiometer (SGG) that is constructed with a pair of magnetically levitated test masses coupled to superconducting quantum-interference devices. A design that gives a potential sensitivity of 1.4×10−4 E Hz−1/2 (1 E≡10−9 s−2) in the frequency band of 1 to 50 mHz and better than 2×10−5 E Hz−1/2 between 0.1 and 1 mHz for a compact tensor SGG that fits within a 22-cm-diameter sphere. The SGG has the capability of rejecting the platform acceleration and jitter in all 6 degrees of freedom to one part in 109. Such an instrument has applications in precision tests of fundamental laws of physics, earthquake early warning, and gravity mapping of Earth and the planets.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown