1st Joint Commission 2 and IGFS Meeting
International Symposium on
Gravity, Geoid and Height Systems 2016

September 19-23, 2016
Thessaloniki, Greece

Ultrasensitive Ultra Cold Atom Gradiometer, from capability demonstrations in laboratory to space missions

19/09/2016 | 15:45 | Session 1: New missions and concept performance

Author(s):

Sébastien Merlet, Mehdi Langlois, Azer Trimeche, Carlos Garrido Alzar and Franck Pereira Dos Santos

Abstract

Atom interferometry allows for the realization of a generation of instruments for inertial sensing based on laser cooled atoms. Latest advances permit fast preparation of Ultra-Cold Atom sources to nK temperatures. Moreover, more robust and more powerful lasers are now available. New atom interferometers taking advantage of these progresses will lead to development of the next generation of inertial sensors, with new geometries exploring new capabilities.

In this framework, we have started to develop a gradiometer measuring the Earth vertical gravity gradient. It combines:

  1. two ultra-cold sources obtained with on chip magnetic traps,
  2. powerful lasers to drive the atoms.

These two key points will be combined to realize interferometers based on multi-photonic beam splitters of hundreds of ħk (instead of 2ħk previously) in a fountain configuration. For a cycling time of 2 s, the expected differential sensitivity is 1.3×10-11 g with 1 s of measurement for a detection limited by the quantum projection noise. As the two clouds will be separated by 1 m, this will lead to a sensitivity on the vertical gradient, of 126 mE with 1 s of measurement in the laboratory.

I will present the instrument under development and its status, and will extend to space mission. Indeed, without gravity, the interferometer time parameter can be much more longer. For example, if the interferometer time is increased by a factor of 10, a sensitivity of 2 mE with 1 s of measurement can be obtained.

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