A5058995493- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Geophysics and Sensor Technology
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Magnetic confinement fusion research
- Mechanical and Optical Resonators
- Astrophysics and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Advanced MEMS and NEMS Technologies
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Spacecraft and Cryogenic Technologies
- earthquake and tectonic studies
- Real-time simulation and control systems
- Experimental Learning in Engineering
- Radio Astronomy Observations and Technology
National Institute for Subatomic Physics
2014-2024
Université Paris Cité
2023
Laboratoire AstroParticule et Cosmologie
2023
Centre National de la Recherche Scientifique
2023
Vrije Universiteit Amsterdam
2010-2014
Advanced gravitational wave interferometers, currently under realization, will soon permit the detection of waves from astronomical sources. To open era precision astronomy, a further substantial improvement in sensitivity is required. The future space-based Laser Interferometer Space Antenna and third-generation ground-based observatory Einstein Telescope (ET) promise to achieve required improvements frequency ranges. vastly improved third generation observatories could detailed...
Advanced gravitational wave detectors, currently under construction, are expected to directly observe signals of astrophysical origin. The Einstein Telescope (ET), a third-generation detector, has been proposed in order fully open up the emerging field astronomy. In this paper we describe sensitivity models for ET and investigate potential limits imposed by fundamental noise sources. A special focus is set on evaluating frequency band below 10 Hz where complex mixture seismic, gravity...
Large gravitational wave interferometric detectors, like Virgo and LIGO, demonstrated the capability to reach their design sensitivity, but transform these machines into an effective observational instrument for astronomy a large improvement in sensitivity is required. Advanced detectors near future third-generation observatories more than one decade will open possibility perform astronomical observations from Earth. An overview of possible science reaches technological progress needed...
The advanced interferometer network will herald a new era in observational astronomy. There is very strong science case to go beyond the detector and build detectors that operate frequency range from 1 Hz-10 kHz, with sensitivity factor ten better amplitude. Such be able probe of topics nuclear physics, astronomy, cosmology fundamental providing insights into many unsolved problems these areas.
We report an ultra-sensitive seismic accelerometer with nano-g sensitivity, using geometric anti-spring technology. High sensitivity is achieved by on-chip mechanical preloading system comprising four sets of curved leaf springs that support a proof-mass. Using this mechanism, stiffness reduction up to factor 26 in the sensing direction has been achieved. This increases acceleration same factor. The independent proof-mass position, preserving linear properties mechanics and due its purely...
The next generation gravitational wave interferometric detectors will likely be underground to extend the GW detection frequency band frequencies below Newtonian noise limit. originates from continuous motion of Earth's crust driven by human activity, tidal stresses and seismic motion, mass density fluctuations in atmosphere. It is calculated that on surface, a typical day, it exceed expected signals at 10 Hz. decrease an unknown amount. important investigate quantify this reduction its...
Fluctuations of the local gravitational field as a result seismic and atmospheric displacements will limit sensitivity ground based wave detectors at frequencies below 10 Hz. We discuss implications Newtonian noise for future third generation detectors. The relevant fields are predominately human origin dependent on infrastructure population density. Seismic studies presented here show that considerable reduction is possible compared to current detector locations. A realistic amplitude...
The third-generation of gravitational wave observatories, such as the Einstein Telescope (ET) and Cosmic Explorer (CE), aim for an improvement in sensitivity at least a factor ten over wide frequency range compared to current advanced detectors. In order inform design detectors develop qualify their subsystems, dedicated test facilities are required. ETpathfinder prototype uses full interferometer configurations aims provide high facility similar environment ET. Along with interferometry...
There is a strong scientific case for the study of gravitational waves at or below lower end current detection bands. To take advantage this benefit, future generations ground based wave detectors will need to expand limit their bands towards frequencies. Seismic motion presents major challenge these frequencies and vibration isolation systems play crucial role in achieving desired low-frequency sensitivity. A compact system designed isolate in-vacuum optical benches Advanced Virgo be...
We present a compact, vacuum compatible seismic attenuation system designed to isolate five auxiliary optical benches for Advanced Virgo, second generation gravitational wave detector. report on the design of device, coined MultiSAS (multistage system) and its measured vibration isolation performance. The latter can be summarized by quoting payload ratio at 10 Hz 100 dB 140 in vertical horizontal, respectively. also performance control along translation degrees freedom, as well discussion...
A detailed description of the integration structures for barrel region silicon strips tracker ATLAS Phase-II upgrade Large Hadron Collider, so-called High Luminosity LHC (HL-LHC), is presented. This paper focuses on one latest demonstrator prototypes recently assembled, with numerous unique features. It consists a shortened, shield-less, and double sided stave, two candidate power distributions implemented. Thermal electrical performances prototype are presented, as well assembly procedures tools.
Einstein gravitational-wave Telescope (ET) is a design study funded by the European Commission to explore technological challenges of and scientific benefits from building third generation gravitational wave detector. The three-year study, which concluded earlier this year, has formulated conceptual an observatory that can support implementation new technology for next two three decades. goal talk introduce audience overall aims objectives project enumerate ET's potential influence our...
Abstract During the combined commissioning and science run of Virgo in 2010, an extensive noise study revealed that vibrations some injection/detection optics on external injection bench (EIB) made a significant contribution to interferometer's budget. Several resonances were identified between 10 100 Hz EIB support structure 200 300 Hz mounts. These introduced amount beam jitter would limit sensitivity Advanced Virgo. This needed be reduced for reach its full potential. To eliminate this...
KAGRA is a cryogenic interferometric gravitational wave detector currently under construction in the Kamioka mine Japan. Besides test masses, will also rely on room temperature optics which hang at bottom of vibration isolation chains. The payload each chain comprises an optic, system to align it, and active feedback damp resonant motion suspension itself. This article describes performance prototype that was assembled tested vacuum TAMA300 site NAOJ Mitaka, Tokyo. We describe mechanical...
Gravity gradient noise generated by seismic displacements may be the limiting factor for sensitivity of third-generation gravitational wave detectors at frequencies below 10 Hz. A finite element framework has been developed to calculate soil response various excitations. The accompanying gravity gradients as a result displacement field can then evaluated. results are in good agreement with previous analytical results. Finally from single pulse excitation homogenous medium discussed an...
The current interferometric gravitational wave detectors are being upgraded to what termed 'second generation' devices. Sensitivities will be increased by an order of magnitude and these new instruments expected uncover the field astronomy. A main challenge in this endeavor is mitigation noise induced seismic motion. Detailed studies with Virgo show that can reinjected into dark fringe signal. For example, laser beam jitter backscattered light limit sensitivity interferometer. Here, we focus...
Gravity gradient noise generated by seismic displacements constitute a limiting factor for the sensitivity of ground based gravitational wave detectors at frequencies below 10 Hz. We present finite element framework to calculate soil response various excitations. The accompanying gravity gradients as result displacement field can then be evaluated. is first shown accurately model waves in homogenous media. Calculations are agreement with previous analytical results. Finally results from...
We present a novel analysis of gas damping in capacitive MEMS transducers that is based on simple analytical model, assisted by Monte-Carlo simulations performed Molflow+ to obtain an estimate for the geometry dependent diffusion time. This combination provides results with minimal computational expense and through freely available software, as well insight into how depends transducer molecular flow regime. The can be used predict arbitrary mixtures. was verified experimental both air helium...