Microscope—extreme stability requirements for femto-g measurements

Bousquet, P. W.; Pouilloux, Benjamin; Serieys, C.; Bellouard, E.; Puillet, Christian; Dubois, J.-B.

doi:10.1016/j.actaastro.2007.12.046

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…The ultra-sensitive differential accelerometer is crucial to the NEP test precision. The electrostatic suspension provides the capability to generate very weak but accurate force, allowing the accelerometers to achieve extremely high resolution by largely decreasing their measurement ranges [ 16 ]. During the instrument operation, both masses are controlled with respect to the same instrument frame: the sum of these forces is maintained virtually null benefiting from good microgravity level provided by the floating experiment capsule.…”

Section: Concept Of the Space Station-based Nep Experimentsmentioning

confidence: 99%

Design and Fabrication of a Differential Electrostatic Accelerometer for Space-Station Testing of the Equivalence Principle

Han

Liu

et al. 2016

Sensors

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The differential electrostatic space accelerometer is an equivalence principle (EP) experiment instrument proposed to operate onboard China’s space station in the 2020s. It is designed to compare the spin-spin interaction between two rotating extended bodies and the Earth to a precision of 10−12, which is five orders of magnitude better than terrestrial experiment results to date. To achieve the targeted test accuracy, the sensitive space accelerometer will use the very soft space environment provided by a quasi-drag-free floating capsule and long-time observation of the free-fall mass motion for integration of the measurements over 20 orbits. In this work, we describe the design and capability of the differential accelerometer to test weak space acceleration. Modeling and simulation results of the electrostatic suspension and electrostatic motor are presented based on attainable space microgravity condition. Noise evaluation shows that the electrostatic actuation and residual non-gravitational acceleration are two major noise sources. The evaluated differential acceleration noise is 1.01 × 10−9 m/s2/Hz1/2 at the NEP signal frequency of 0.182 mHz, by neglecting small acceleration disturbances. The preliminary work on development of the first instrument prototype is introduced for on-ground technological assessments. This development has already confirmed several crucial fabrication processes and measurement techniques and it will open the way to the construction of the final differential space accelerometer.

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Section: Concept Of the Space Station-based Nep Experimentsmentioning

confidence: 99%

Design and Fabrication of a Differential Electrostatic Accelerometer for Space-Station Testing of the Equivalence Principle

Han

Liu

et al. 2016

Sensors

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show abstract

“…The electrostatic suspension provides the capability to generate a very weak while accurate force, allowing the accelerometers to achieve extremely high resolution by largely decreasing their measurement ranges. [17] Five pairs of electrodes, each associated to one channel, are used for very accurate capacitive position sensing and electrostatic force generation. The resultant feedback forces are derived from the accurate measurement of the applied voltages on the pairs of electrodes.…”

Section: Fa = (𝐼 + 𝐾mentioning

confidence: 99%

Proposed Space Test of the New Equivalence Principle with Rotating Extended Bodies

Han¹,

Wu²,

Zhou³

et al. 2014

Chinese Phys. Lett.

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We propose a novel scheme for a space free-fall based test of the new equivalence principle (NEP) with two rotating extended bodies made of the same material. The measurement will be carried out by placing the two concentric spinning masses of very different momenta inside a differential electrostatic accelerometer in a drag-free compensated orbit. A difference in the forces necessary to maintain the common trajectory will be an indication of a violation of equivalence or the existence of spin-spin force between the rotating mass and the Earth. The conceptual design of the inertial sensor and its operation mode is presented. Details specific to the model and performance requirements are discussed by using up-to-date space technologies to test the NEP with an accuracy of better than 10 −15 .

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On the equivalence principle and gravitational and inertial mass relation of classical charged particles

Goto

Natti

2009

Class. Quantum Grav.

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We show that the locally constant force necessary to get a stable hyperbolic motion regime for classical charged point particles, actually, is a combination of an applied external force and of the electromagnetic radiation reaction force. It implies, as the strong Equivalence Principle is valid, that the passive gravitational mass of a charged point particle should be slight greater than its inertial mass. An interesting new feature that emerges from the unexpected behavior of the gravitational and inertial mass relation, for classical charged particles, at very strong gravitational field, is the existence of a critical, particle dependent, gravitational field value that signs the validity domain of the strong Equivalence Principle. For electron and proton, these critical field values are gc ≃ 4.8 × 10 31 m/s 2 and gc ≃ 8.8 × 10

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Microscope—extreme stability requirements for femto-g measurements

Cited by 4 publications

References 4 publications

Design and Fabrication of a Differential Electrostatic Accelerometer for Space-Station Testing of the Equivalence Principle

Design and Fabrication of a Differential Electrostatic Accelerometer for Space-Station Testing of the Equivalence Principle

Proposed Space Test of the New Equivalence Principle with Rotating Extended Bodies

On the equivalence principle and gravitational and inertial mass relation of classical charged particles

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