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Concept study of measuring gravitational constant using superconducting gravity gradiometer |
Xing Bian(边星)1,2, Ho Jung Paik2, Martin Vol Moody3 |
1 University of Chinese Academy of Sciences, Beijing 100049, China;
2 Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
3 Department of Physics, University of Maryland, College Park, Maryland 20742, USA |
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Abstract Newton's gravitational constant G is the least known fundamental constant of nature. Since Cavendish made the first measurement of G with a torsion balance over two hundred years ago, the best results of G have been obtained by using torsion balances. However, the uncorrected anelasticity of torsion fibers makes the results questionable. We present a new method of G measurement by using a superconducting gravity gradiometer constructed with levitated test masses, which is free from the irregularities of mechanical suspension. The superconducting gravity gradiometer is rotated to generate a centrifugal acceleration that nulls the gravity field of the source mass, forming an artificial planetary system. This experiment has a potential accuracy of G better than 10 ppm.
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Received: 20 April 2018
Revised: 26 April 2018
Accepted manuscript online:
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PACS:
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04.80.-y
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(Experimental studies of gravity)
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84.71.Ba
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(Superconducting magnets; magnetic levitation devices)
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85.25.Dq
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(Superconducting quantum interference devices (SQUIDs))
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Corresponding Authors:
Xing Bian
E-mail: ciahpu@gmail.com
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Cite this article:
Xing Bian(边星), Ho Jung Paik, Martin Vol Moody Concept study of measuring gravitational constant using superconducting gravity gradiometer 2018 Chin. Phys. B 27 080401
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