A5102727956- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Geophysics and Sensor Technology
- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Spectroscopy and Laser Applications
- Advanced Fiber Laser Technologies
- Advanced Chemical Physics Studies
- Mechanical and Optical Resonators
- Laser-Matter Interactions and Applications
- Atomic and Molecular Physics
- Photonic and Optical Devices
- Spectroscopy and Quantum Chemical Studies
- Pulsars and Gravitational Waves Research
- Electron and X-Ray Spectroscopy Techniques
- Ion-surface interactions and analysis
- Plasma Diagnostics and Applications
- Laser-Plasma Interactions and Diagnostics
- Photonic Crystals and Applications
- Solid State Laser Technologies
- Electromagnetic Scattering and Analysis
- Experimental and Theoretical Physics Studies
- Atmospheric Ozone and Climate
- Optical and Acousto-Optic Technologies
Université Côte d'Azur
2018-2022
Observatoire de la Côte d’Azur
2010-2022
Centre National de la Recherche Scientifique
2006-2021
University Frères Mentouri Constantine 1
2018
Centre National pour la Recherche Scientifique et Technique (CNRST)
2015
Systèmes de Référence Temps-Espace
2007-2014
Authorised Association Consortium
2014
Deleted Institution
2009-2014
Laboratoire Aimé Cotton
2004-2011
CEA Cadarache
2011
We present an underground long baseline atom interferometer to study gravity at large scale. The hybrid atom-laser antenna will use several interferometers simultaneously interrogated by the resonant mode of optical cavity. instrument be a demonstrator for gravitational wave detection in frequency band (100 mHz - 1 Hz) not explored classical ground and space-based observatories, interesting potential astrophysical sources. In initial configuration, standard interferometry techniques adopted,...
We present the full evaluation of a cold atom gyroscope based on interferometry. have performed extensive studies to determine systematic errors, scale factor and sensitivity. demonstrate that acceleration noise can be efficiently removed from rotation signal allowing reach fundamental limit quantum projection for short term measurements. The technical limits long sensitivity accuracy been identified, clearing way next generations ultra-sensitive gyroscopes.
We propose a new detection strategy for gravitational waves (GWs) below few hertz based on correlated array of atom interferometers (AIs). Our proposal allows us to reduce the Newtonian noise (NN), which limits all ground GW detectors hertz, including previous interferometry-based concepts. Using an long baseline AI gradiometers yields several estimations NN, whose effect can thus be reduced via statistical averaging. Considering km current optical detectors, NN rejection factor 2 could...
We study the influence of off-resonant two-photon transitions on high-precision measurements with atom interferometers based stimulated Raman transitions. These resonances induce a light shift resonant condition. The impact this effect is investigated in two highly sensitive experiments using gravimeter and gyroscope-accelerometer. show that it can lead to significant systematic phase shifts, which have be taken into account order achieve best performances terms accuracy stability.
Since the signature of ITER treaty in 2006, a new research programme targeting emergence generation neutral beam (NB) system for future fusion reactor (DEMO Tokamak) has been underway between several laboratories Europe. The specifications required to operate NB on DEMO are very demanding: provide plasma heating, current drive and control at high level power (up 150 MW) energy (1 or 2 MeV), including performances term wall-plug efficiency (η > 60%), availability reliability. To this aim,...
In parallel to the developments dedicated ITER neutral beam (NB) system, CEA-IRFM with laboratories in France and Switzerland are studying feasibility of a new generation NB system able provide heating current drive for future DEMOnstration fusion reactor. For steady-state scenario, will have high power level wall-plug efficiency (η ∼ 60%). Neutralization energetic negative ions by photodetachment (so called photoneutralization), if feasible, appears be ideal solution meet these...
Gravitational Waves (GWs) were observed for the first time in 2015, one century after Einstein predicted their existence. There is now growing interest to extend detection bandwidth low frequency. The scientific potential of multi-frequency GW astronomy enormous as it would enable obtain a more complete picture cosmic events and mechanisms. This unique entirely new opportunity future astronomy, success which depends upon decisions being made on existing infrastructures. prospect combining...
A photodetachment experiment is performed on the v=0-->v=0 OH(-) detachment threshold. The weak O and S branches provide a signal strong enough to make amplitude measurements all five O, P, Q, R, possible, which are used fix formulas for their relative intensities. Photodetachment microscopy applied 15 different thresholds of R branches. quantitative analysis interference patterns obtained does not show any effect dipole moment OH, but yields new measurement rotational parameters OH(-)(v=0)...
As part of the research on thermal noise reduction in gravitational-wave detectors, we experimentally demonstrate conversion a fundamental ${\mathrm{TEM}}_{00}$ laser mode at 1064 nm to higher-order Hermite-Gaussian modes (HG) arbitrary order via commercially available liquid crystal spatial light modulator. We particularly studied ${\mathrm{HG}}_{5,5}/{\mathrm{HG}}_{10,10}/{\mathrm{HG}}_{15,15}$ modes. A two-mirror plano-spherical cavity filters spatially. analyze cleaned three-mirror...
We are building a hybrid detector of new concept that couples laser and matter-wave interferometry to study sub Hertz variations the strain tensor space-time gravitation. Using set atomic interferometers simultaneously manipulated by resonant optical field 200 m cavity, MIGA instrument will allow monitoring evolution gravitational at unprecedented sensitivity, which be exploited both for geophysical studies Gravitational Waves (GWs) detection. This infrastructure embedded into LSBB...
The MIGA project aims at demonstrating precision measurements of gravity with cold atom sensors in a large scale instrument and studying the associated applications geosciences fundamental physics. first stage (2013-2018) will consist building 300-meter long optical cavity to interrogate interferometers be based low noise underground laboratory LSBB Rustrel, France. second (2018-2023) dedicated science runs data analyses order probe spatio-temporal structure local field region, site high...
Photodetachment microscopy of a beam 32S− ions makes it possible to measure the detachment thresholds corresponding different fine-structure levels negative ion S− and neutral atom S. The electron affinity sulfur, at 2.077 eV, is well suited for by tunable dye laser, which provides third way measuring S fine structure, besides VUV spectroscopy I lines direct resonance spectroscopy. intervals are found be 48 353.52(34) m−1 2P1/2 − 2P3/2 energy difference in S−, 39 605.87(32) 3P1 3P2 one (with...
An exploratory study of negative ion beam photo‐neutralization for future fusion reactors is explained. A refolded Fabry‐Perot cavity system proposed, with which a 60% neutralisation efficiency could be reached low electric power consumption. The would make use sophisticated optical‐cavity locking systems, have been developed recently gravitational‐wave optical detection. ITER Neutral Injector taken as an example.
An innovative high efficiency neutral beam injector concept for future fusion reactors is under investigation (simulation and R&D) between several laboratories in France, the goal being to perform a feasibility study neutralization of intense energy (1 MeV) negative ion (NI) beams by photo‐detachment.The objective proposed project put together expertise three leading groups quantum physics, power stabilized lasers injectors studies new called SIPHORE (SIngle gap PHOto‐neutralizer REcovery...
Abstract Achievement of an economic fusion reactor imposes a high level unprecedented requirements for neutral beam systems; the first one is nuclear safety constraints which impose prerequisite on ease access all injector components to provide preventive (and curative) maintenance by remote handling while maintaining operation. In addition, challenge develop high-power injectors with very wall-plug efficiency (above 60%) that are able operate in stable conditions over several months. There...
Photoneutralization may represent a key issue in the neutral beam injectors for future fusion reactors. In fact, photodetachment based neutralization combined with an energy recovery system increase injector overall efficiency up to 60%. This is SIPHORE concept which photoneutralization realized refolded cavity [1]. However, about 1 W of several megaWatts intracavity power absorbed by mirrors coatings and gives rise important thermoelastic distortions. expected change optical behavior reduce...
We proposed the European Laboratory for Gravitation and Atom-interferometric Research (ELGAR), an array of atom gradiometers aimed at studying space-time gravitation with primary goal observing gravitational waves (GWs) in infrasound band a peak strain sensitivity $3.3 \times 10^{-22}/\sqrt{\text{Hz}}$ 1.7 Hz. In this paper we detail main technological bricks large scale detector emphasis research pathways to be conducted its realization. discuss site options, optics, source requirements...
Matter-wave interferometers, either with electrons, atoms or molecules, owe their sensitivity to the accuracy of phase-shift measurements. One may, however, raise question whether shift undergone by interference fringes, when external forces are applied, actually differs from classical trajectories. For case a magnetic perturbation, we provide experimental evidence and vector demonstration that patterns only undergo global shift. The experiment is performed photodetachment microscope,...
In future fusion reactors, heating system efficiency is of the utmost importance. Photo-neutralization substantially increases neutral beam injector (NBI) with respect to foreseen in International Thermonuclear Experimental Reactor (ITER) based on a gaseous target. this paper, we propose telescope-based configuration be used NBI photo-neutralizer cavity demonstration power plant (DEMO) project. This greatly reduces total length cavity, which likely solves overcrowding issues reactor...