B. Vallage
A5105520714- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Particle physics theoretical and experimental studies
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Atomic and Molecular Physics
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Astrophysical Phenomena and Observations
- Tropical and Extratropical Cyclones Research
- Atmospheric Ozone and Climate
- Soil Moisture and Remote Sensing
- Graphene research and applications
- Methane Hydrates and Related Phenomena
- Copper Interconnects and Reliability
- Quantum Electrodynamics and Casimir Effect
- Plant Molecular Biology Research
- Computational Physics and Python Applications
- Underwater Acoustics Research
- CCD and CMOS Imaging Sensors
- Plant Reproductive Biology
Université Paris Cité
2014-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2024
Institut de Recherche sur les Lois Fondamentales de l'Univers
2015-2024
Université Paris-Saclay
2018-2024
CEA Paris-Saclay
2015-2024
Centre National de la Recherche Scientifique
2012-2024
Laboratoire AstroParticule et Cosmologie
2012-2024
University of Groningen
2023
University of Genoa
2023
CTA Observatory
2021
Abstract We report on the first production of an antihydrogen beam by charge exchange 6.1 keV antiprotons with a cloud positronium in GBAR experiment at CERN. The 100 antiproton delivered AD/ELENA facility was further decelerated pulsed drift tube. A 9 MeV electron from linear accelerator produced low energy positron beam. positrons were accumulated set two Penning–Malmberg traps. target resulted conversion extracted steered onto this to produce antiatoms. observe excess over background...
We present a description of the GBAR positron (e+) trapping apparatus, which consists three stage Buffer Gas Trap (BGT) followed by High Field Penning (HFT), and discuss its performance. The overall goal experiment is to measure acceleration neutral antihydrogen (H¯) atom in terrestrial gravitational field neutralising positive ion (H¯+), has been cooled low temperature, observing subsequent H¯ annihilation following free fall. To produce one H¯+ ion, about 1010 positrons, efficiently...
The ASACUSA Micromegas Tracker (AMT; ASACUSA: Atomic Spectroscopy and Collisions Using Slow Antiprotons) was designed to be able reconstruct antiproton-nucleon annihilation vertices in three dimensions. goal of this device is study antihydrogen formation processes the cusp trap, which synthesise a spin-polarised beam for precise tests Charge, Parity, Time (CPT) symmetry invariance. This paper discusses structure technical details an AMT detector built into such environment, its data...
This contribution reports on the read-out system of future KM3NeT undersea network several thousands synchronized optical detecting nodes. Each node embeds a specifically designed fully integrated communicating based Xilinx FPGA SoC technology. It runs VxWorks real-time OS and DAQ software within Ice middleware framework resulting in highly flexible, controllable scalable distributed application. Clock distribution delay calibration over customized fixed latency gigabit Ethernet links enable...
We have studied the properties of a commercially available 4H-SiC epitaxial layer and evaluated its potential application as an efficient positron remoderator. A remoderation efficiency more than 65% has been measured for incident positrons with 1 keV energy. determined work function energy distribution emitted slow positrons, property which is essential practical applications. Comparison moderation results from n-type single crystal, indicate that epitaxially grown superior secondary...
The GBAR experiment aims to measure the gravitational acceleration of antihydrogen H.It will use H+ ions formed by interaction antiprotons with a dense positronium cloud, which require about 10 positrons produce one H + .We present first results on positron accumulation, reaching 3.8 ± 0.4 × 8 e collected in 560 s.
A new slow positron beamline featuring a large acceptance positronium lifetime spectrometer has been constructed and tested at the linac-based source IRFU CEA Saclay, France. The instrument will be used in development of dense target cloud for GBAR experiment. project aims precise measurement gravitational acceleration antihydrogen field Earth. Beyond application fundamental science, materials research, testing thin porous films layers by means annihilation. is being as test bench to develop...
The ANTARES telescope has the opportunity to detect transient neutrino sources, such as gamma-ray bursts (GRBs), core-collapse supernovae (SNe), flares of active galactic nuclei (AGNs)... To enhance sensitivity these we are developing a new detection method based on observation followed by an optical detection. Collaboration is implementing fast on-line event reconstruction with good angular resolution. These characteristics allow trigger network in order identify nature neutrinos (and high...
We have developed a PbWO4 (PWO) detector with large dynamic range to measure the intensity of positron beam and absolute density ortho-positronium (o-Ps) cloud it creates.A simulation study shows that setup based on such detectors may be used determine angular distribution emission reflection o-Ps reduce part uncertainties measurement.These will allow improve precision in measurement cross-section for (anti)hydrogen formation by (anti)proton-positronium charge exchange optimize yield...
The ANTARES collaboration reported the results of a search for point-like neutrino sources using data taken in period 2007-2010. An unbinned maximum likelihood based all-sky yielded cluster 9 (5) events within cone 3 (1) degrees around (R.A., Dec) = (-46.5deg, -65.0deg). trial factor corrected p-value 2.6% (2.2 sigma) is not significant enough to claim observation an astrophysical point source. However, it currently constitutes most localized excess observed by ANTARES. Here we present...
The Gravitational Behaviour of Antihydrogen at Rest experiment - GBAR is designed to perform a direct measurement the weak equivalence principle on antimatter by measuring acceleration () antihydrogen atoms in free fall. Its originality produce + ions and use sympathetic cooling minimize initial velocity. These are produced using charge exchange reactions with dense positronium cloud, created an intense pulse electron-linac-produced positrons that accumulated Penning-Malmberg trap.
NectarCAM is a Cherenkov camera that will be installed on Medium-Sized Telescopes of the northern array Telescope Array Observatory (CTAO). It composed 265 modules, each which includes 7 photo-multiplier tubes, Front-End Board and trigger system for data collection. The first unit currently being integrated at CEA Paris-Saclay in France. Once CTAO’s site, NectarCAM’s timing abilities crucial reducing noise images, improving image cleaning, distinguishing between gamma-ray photons cosmic-ray...