P. Lansonneur
A5051516289- Atomic and Molecular Physics
- Muon and positron interactions and applications
- Radiation Therapy and Dosimetry
- Advanced Radiotherapy Techniques
- Particle Detector Development and Performance
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Detection and Scintillator Technologies
- Quantum Mechanics and Applications
- Particle accelerators and beam dynamics
- Advanced Chemical Physics Studies
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Quantum and Classical Electrodynamics
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Cold Fusion and Nuclear Reactions
- Advanced Frequency and Time Standards
- Laser-induced spectroscopy and plasma
- Engineering Applied Research
- X-ray Spectroscopy and Fluorescence Analysis
- Plasma Diagnostics and Applications
- Experimental and Theoretical Physics Studies
- Quantum Electrodynamics and Casimir Effect
- Magneto-Optical Properties and Applications
Varian Medical Systems (United States)
2024-2025
Université Paris Sciences et Lettres
2019-2023
Institut Curie
2019-2023
Centre National de la Recherche Scientifique
2013-2020
Institute of Nuclear Physics of Lyon
2016-2020
Université Claude Bernard Lyon 1
2015-2020
Institute of Nuclear Physics
2018
Laboratoire Aimé Cotton
2017
Université Paris-Sud
2016-2017
Université Paris-Saclay
2016-2017
We demonstrate the laser excitation of $n=3$ state positronium (Ps) in vacuum. A combination a specially designed pulsed slow positron beam and high-efficiency converter target was used to produce Ps. Its annihilation recorded by single-shot lifetime spectroscopy. Pulsed level at wavelength $\ensuremath{\lambda}\ensuremath{\approx}205$ nm monitored via Ps photoionization induced second intense pulse $\ensuremath{\lambda}=1064$ nm. About 15% overall emitted into vacuum excited photoionized....
Abstract Proton minibeam radiation therapy (pMBRT) is a novel dose delivery method based on spatial fractionation. pMBRT has been shown to be promising in terms of reduced side effects and superior tumour control high-grade glioma-bearing rats compared standard irradiation. These findings, together with the recent optimized implementation clinical pencil beam scanning system, have triggered reflection possible application patient treatments. In this context, present study was designed...
We describe a system designed to re-bunch positron pulses delivered by an accumulator supplied source and Surko-trap. Positron from the are magnetically guided in 0.085 T field injected into region free of magnetic fields through μ-metal terminator. Here positrons temporally compressed, electrostatically accelerated towards porous silicon target for production emission positronium vacuum. Positrons focused spot less than 4 mm FWTM bunches ∼8 ns FWHM. Emission vacuum is shown single shot...
Positronium in the $2^{\phantom{\rule{0.16em}{0ex}}3}\mathrm{S}$ metastable state exhibits a low electrical polarizability and long lifetime (1140 ns), making it promising candidate for interferometry experiments with neutral matter-antimatter system. In present work, positronium is produced, absence of an electric field, via spontaneous radiative decay from $3^{\phantom{\rule{0.16em}{0ex}}3}\mathrm{P}$ level populated 205-nm UV laser pulse. Thanks to short temporal length pulse, 1.5 ns full...
Abstract Background Ultra‐high dose rate, or FLASH, radiotherapy has shown promise in preclinical experiments of sparing healthy tissue without compromising tumor control. This “FLASH effect” can compound with dosimetric the proton Bragg peak (BP) using a method called Single Energy Pristine Peak (SEPBP) FLASH. However, this and other proposed FLASH techniques are constrained by lack familiar treatment planning systems (TPSs). Creating modules to implement SEPBP into commercial TPS opens up...
Producing positronium (Ps) in the metastable $2^3\text{S}$ state is of interest for various applications fundamental physics. We report here about an experiment which Ps atoms are produced this long-lived by spontaneous radiative decay excited to $3^3\text{P}$ level manifold. The cloud excitation obtained with a UV laser pulse experimental vacuum chamber presence guiding magnetic field 25 mT and average electric 300 V/cm. indication production from novel analysis technique single-shot...
Abstract We describe a multi-step “rotating wall” compression of mixed cold antiproton–electron non-neutral plasma in 4.46 T Penning–Malmberg trap developed the context AEḡIS experiment at CERN. Such traps are routinely used for preparation antiprotons suitable antihydrogen production. A tenfold antiproton radius has been achieved, with minimum only 0.17 mm. experimental conditions necessary to perform such compression: minimizing tails electron density distribution is paramount ensure that...
The AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) experiment is designed with the objective to test weak equivalence principle antimatter by studying free fall of antihydrogen in Earth's gravitational field. A pulsed cold beam will be produced charge exchange between Ps excited Rydberg state and antiprotons. Finally measured a classical moiré deflectometer. apparatus being assembled at Antiproton Decelerator CERN described, then advancements reported: positrons...
The efficient production of cold antihydrogen atoms in particle traps at CERN's Antiproton Decelerator has opened up the possibility performing direct measurements Earth's gravitational acceleration on purely antimatter bodies. goal AEgIS collaboration is to measure value
Forming a pulsed beam of cold antihydrogen using charge-exchange with Rydberg positronium (Ps) is the goal AEḡIS collaboration, which aims to first gravity measurement on neutral antimatter. Recently achieved results in Ps formation and laser spectroscopy main apparatus are summarized. First, has been produced nanochanneled silicon targets cryogenic environment (~ 15 K) 1 T magnetic field observed by means Single-Shot Positron Annihilation Lifetime Spectroscopy. The demonstration n=3...
The characteristics of low energy antiproton annihilations on nuclei (e.g. hadronization and product multiplicities) are not well known, Monte Carlo simulation packages that use different models provide descriptions the annihilation events. In this study, we measured particle multiplicities resulting from nuclei. results were compared with predictions obtained using in tools GEANT4 FLUKA. For exposed thin targets (Cu, Ag Au) to a very beam CERN's Antiproton Decelerator, exploiting secondary...
Abstract From the experimental point of view, very little is known about gravitational interaction between matter and antimatter. In particular, Weak Equivalence Principle, which paramount importance for General Relativity, has not yet been directly probed with The main goal AEgIS experiment at CERN to perform a direct measurement force on idea measure vertical displacement beam cold antihydrogen atoms, traveling in field Earth, by means moiré deflectometer. An overview physics goals...
We report on recent developments in positronium work the frame of antihydrogen production through charge exchange AEgIS collaboration [1]. In particular, we present a new technique based spatially imaging cloud by collecting positrons emitted photoionization. This background free diagnostic proves to be highly efficient and opens up opportunities for spectroscopy antimatter, control laser manipulation clouds as well Doppler velocimetry.
The AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is a CERN based experiment with the central aim to measure directly gravitational acceleration of antihydrogen. Antihydrogen atoms will be produced via charge exchange reactions which consist Rydberg-excited positronium sent cooled antiprotons within an electromagnetic trap. resulting Rydberg antihydrogen then horizontally accelerated by electric field gradient (Stark effect), they pass through moiré deflectometer....
The weak equivalence principle states that the motion of a body in gravitational field is independent its structure or composition. This postulate general relativity has been tested to very high precision with ordinary matter, but no relevant experimental verification antimatter ever carried out. AEGIS experiment will measure acceleration antihydrogen ultimately 1% precision. For this purpose, pulsed horizontal beam velocity several 100 m s−1 be produced. Its vertical deflection due gravity...