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Design and Evaluation of a Differential Accelerometer for Drop-Tower Equivalence Principle Test with Rotating Masses |
| Feng-Tian Han**, Tian-Yi Liu, Xiao-Xia He, Qiu-Ping Wu** |
Department of Precision Instrument, Tsinghua University, Beijing 100084
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| Cite this article: |
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Feng-Tian Han, Tian-Yi Liu, Xiao-Xia He et al 2017 Chin. Phys. Lett. 34 100701 |
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Abstract A differential accelerometer comprising of two rotating masses made of the same material is proposed for drop tower-based free-fall testing of the spin–spin force between the rotating mass and the Earth. The measurement is performed by placing the two concentric masses of very different momenta in a vacuum drop capsule which is falling freely in the Earth's gravitational field. A nonzero output of the differential accelerometer is an indication of possible violation of new equivalence principle (NEP). We present the conceptual design of a modified free-fall NEP experiment which can be performed at the Beijing drop tower. Design and evaluation of the differential accelerometer with a hybrid electrostatic/magnetic suspension system are presented to accommodate for operation on ground and drop-tower tests. Details specific to the measurement uncertainty are discussed to yield an NEP test accuracy of $7.2\times10^{-9}$.
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Received: 19 July 2017
Published: 27 September 2017
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| PACS: |
07.87.+v
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(Spaceborne and space research instruments, apparatus, and components (satellites, space vehicles, etc.))
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04.80.Cc
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(Experimental tests of gravitational theories)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 91436107 and 61374207. |
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