The ICE (Interférométrie atomique à sources Cohérentes pour l'Espace) experiment is a compact and transportable atom interferometer designed to test the weak equivalence principle (also known as the universality of free fall) using cold atomic ensembles of potassium and rubidium while in the microgravity environment generated by parabolic flight.

The experiment is a collaboration between LP2N in Bordeaux and the LNE-SYRTE laboratory in Paris, and is largely funded by the French national Space agency CNES. It is designed to be operated both on ground and onboard the Novespace "Zero-G" Airbus, which makes parabolic flight campaigns out of Bordeaux airport in France.

ICE - Atom Interferometry for Space Applications

Inertial sensors based on matter-wave interferometry have benefited from the progress in laser-cooling techniques over the past 20 years, and offer performances comparable or better than their classical counterparts. Recent developments in laser technologies has made it possible to develop transportable devices, with applications in geophysics, inertial navigation and tests of fundamental physics.

The experimental apparatus was specifically designed to withstand vibrations and temperature fluctuations onboard the Novespace Zero-G aircraft, and was used to demonstrate the first airborne matter-wave inertial sensor in 2010. More recently, in 2015, the ICE team successfully operated two simultaneous interferometers of rubidium-87 and potassium-39 which enabled the first test of the weak equivalence principle in a free-falling vehicle.

Since 2018, we are able to perform experiments in the laboratory thanks to a unique, purpose made Einstein elevator on which the experimental apparatus is installed. This device allows us to access microgravity for up to 500 ms every 12 s and we were able to produce Bose-Einstein condensates with forty thousand rubidium-87 atoms at a temperature of 35 nK in weightlessness. Ultra-cold atomic samples will help improve the sensitivity of our atom interferometer.

Experimental Setup
 

The extreme environment of the 0g-plane in terms of temperature variations, vibration levels and congestion entails to have a very compact and robust experimental setup in addition to be transportable. The apparatus thus consists in eight racks independently removable with a weight between 100 and 180kg each. The laser system is almost entirely fibered (except the combining/splitting of the beams which consists in a compact micro-optics bench in ZERODUR developed by muQuanS and Kylia). Based on the frequency-doubled telecom technology, it is immune to misalignment. Diodes and PPLN temperature is very well controlled thanks to numerous lock-in systems.

 

The vacuum system is made of Titanium and viewports are sealed with indium which gives 19 optical axis for the laser cooling and trapping beams, the detection, the crossed far off resonance dipole trap and three axis for retro-reflected Raman beams for multi-axis inertial measurements. The complete system with collimators and all the optics and detectors is surrounded by a magnetic shield to strongly reduce the external varying magnetic field in the plane. Inside the shield, the homogeneity of the magnetic field is insured by Helmholtz coils pairs and lock-in electronics with a probe.

The Einstein elevator, also known as zero-g simulator, was designed and built by the French company Symétrie (www.symetrie.fr). It works by moving a platform, on which the experimental apparatus rests, in a way that mimicks the trajectory of an object in free fall, launched vertically, i.e. a parabola. The platform moves vertically between two granite columns (2.7 m tall) thanks to two carriages with air bearings for a frictionless motion. Linear motors mounted on the sides of the columns are responsible for the accelerations of the moving parts necessary to perform parabolic trajectories. The 0-g simulator can provide up to half a second of weightlessness on every trajectory and, thanks to its very high repetition rate (1 parabola every 12s), gives access to a very long accumulated duration of 0-g. 

The goal of our set-up is to pave the way for onboard atom interferometry and to deals with vibrations and rotation issues. That’s why we developed hybridization technics with classical sensors such as an accelerometer put on the reference mirror and gyroscopes to know the angle of our measurement axis.

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Philippe Bouyer

Project director

philippe.bouyer at institutoptique.fr

Arnaud Landragin

Project co-director at LNE-SYRTE in Paris

arnaud.landragin at obspm.fr

Baptiste Battelier

Senior scientist with CNRS, LP2N, permanent member of the ICE Team

baptiste.battelier at institutoptique.fr

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ICE - Team Members

Post Docs

Vincent Jarlaud

Post-doc on ICE since 2020.

vincent.jarlaud@institutoptique.fr

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PhD Students

Romain Arguel

Doctoral student on ICE since 2018

romain.arguel@institutoptique.fr

Célia Pelluet

Doctoral student on ICE since October 2020

celia.pelluet@u-psud.fr

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Master's Students

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Previous Members

  • Martin Rabault

    • PhD student on ICE from 2016 - 2019​

    • Now working at MuQuans

  • Gabriel Condon

    • Post-Doc on ICE from 2015 - 2019​

    • Now a senior scientist at MuQuans

  • Laure Chichet

    • PhD student on ICE from 2014 - 2017​

    • Now junior scientist at Teledyne e2v (UK)

  • Laura Antoni-Micollier

    • PhD student on ICE from 2013 - 2016

    • Now a research engineer at MuQuans

  • Brynle Barrett

    • Post-Doc on ICE from 2012 - 2015​

    • Professor (assistant) at University of New Brunswick (Canada)​​  

  • Pierre Alain-Gominet

    • PhD student on ICE from 2011 - 2014​

    • Now an aerospace engineer at Airbus

  • Vincent Menoret

    • PhD student on ICE from 2009 - 2012​

    • Now a research engineer at MuQuans

 

  • Correlative methods for dual-species quantum tests of the weak equivalence principle, B. Barrett, L. Antoni-Micollier, L. Chichet, B. Battelier, P.-A. Gominet, A. Bertoldi, P. Bouyer, and A. Landragin, New J. Phys. 17, 085010 (2015). arXiv:1503.08423

 

 

 

  • Dual-wavelength laser source for onboard atom interferometry, V. Ménoret, R. Geiger, G. Stern, N. Zahzam, B. Battelier, A. Bresson, A. Landragin, and P. Bouyer, Opt. Lett. 36, 4128 (2011)arXiv:1108.2453

 

  • Detecting inertial effects with airborne matter-wave interferometry, R. Geiger, V. Menoret, G. Stern, N. Zahzam, P. Cheinet, B. Battelier, A. Villing, F. Moron, M. Lours, Y. Bidel, A. Bresson, A. Landragin, and P. Bouyer, Nat. Commun. 2, 474 (2011).

 

  • Frequency doubled 1534 nm laser system for potassium laser cooling, G. Stern, B. Allard, M. Robert-de-Saint-Vincent, J.-P. Brantut, B. Battelier, T. Bourdel, and P. Bouyer, Appl. Opt. 49, 3092 (2010). arXiv:1003.4761

 

  • How to estimate the differential acceleration in a two-species atom interferometer to test the equivalence principle, G. Varoquaux, R. A. Nyman, R. Geiger, P. Cheinet, A. Landragin, and P. Bouyer, New J. Phys. 11, 113010 (2009).

 

  • Light-pulse atom interferometry in microgravity, G. Stern, B. Battelier, R. Geiger, G. Varoquaux, A. Villing, F. Moron, O. Carraz, N. Zahzam, Y. Bidel, W. Chaibi, F. Pereira Dos Santos, A. Bresson, A. Landragin, and P. Bouyer, Eur. Phys. J. D 53, 353 (2009). arXiv:0903.3284

 

  • I.C.E.: an ultra-cold atom source for long-baseline interferometric inertial sensors in reduced gravity, G. Varoquaux, N. Zahzam, W. Chaibi, J.-F. Clement, O. Carraz, J.-P. Brantut, R. A. Nyman, F. Pereira Dos Santos, L. Mondin, M. Rouze, Y. Bidel, A. Bresson, A. Landragin, and P. Bouyer, in Proceedings of Rencontres de Moriond: Gravitational Waves and Experimental Gravity, La Thuile, Italy (March 11-18, 2007). arXiv:0705.2922

 

  • I.C.E.: a transportable atomic inertial sensor for test in microgravity, R. A. Nyman, G. Varoquaux, F. Lienhart, D. Chambon, S. Boussen, J.-F. Clément, T. Müller, G. Santarelli, F. Pereira Dos Santos, A. Clairon, A. Bresson, A. Landragin, and P. Bouyer, Appl. Phys. B 84, 673 (2006). arXiv:cond-mat/0605057

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