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43 results on '"Payeur, S."'

1. High Dose-Rate Ionizing Radiation Source from Tight Focusing in Air of a mJ-class Femtosecond Laser

Author

Vallières, S., Powell, J., Connell, T., Evans, M., Fourmaux, S., Payeur, S., Lassonde, P., Fillion-Gourdeau, F., MacLean, S., and Légaré, F.

Subjects
Physics - Optics, Physics - Medical Physics, Physics - Plasma Physics
Abstract

Ultrashort electron beams with femtosecond to picosecond bunch durations offer unique opportunities to explore active research areas ranging from ultrafast structural dynamics to ultra-high dose-rate radiobiological studies. We present a straightforward method to generate MeV-ranged electron beams in ambient air through the tight focusing of a few-cycle, mJ-class femtosecond IR laser. At one meter from the source, the highest measured dose rate of 0.15 Gy/s exceeds the yearly dose limit in less than one second and warrants the implementation of radiation protection. Two-dimensional Particle-In-Cell simulations confirm that the acceleration mechanism is based on the relativistic ponderomotive force and show theoretical agreement with the measured electron energy. Furthermore, we discuss the scalability of this method with the continuing development of mJ-class high average power lasers, moreover providing a promising approach for FLASH radiation therapy., Comment: 22 pages, 8 figures

Published
2022

2. Single shot phase contrast imaging using laser-produced Betatron x-ray beams

Author

Fourmaux, S., Corde, S., Phuoc, K. Ta, Lassonde, P., Lebrun, G., Payeur, S., Martin, F., Sebban, S., Malka, V., Rousse, A., and Kieffer, J. C.

Subjects
Physics - Plasma Physics, Physics - Accelerator Physics, Physics - Optics
Abstract

Development of x-ray phase contrast imaging applications with a laboratory scale source have been limited by the long exposure time needed to obtain one image. We demonstrate, using the Betatron x-ray radiation produced when electrons are accelerated and wiggled in the laser-wakefield cavity, that a high quality phase contrast image of a complex object (here, a bee), located in air, can be obtained with a single laser shot. The Betatron x-ray source used in this proof of principle experiment has a source diameter of 1.7 microns and produces a synchrotron spectrum with critical energy E_c=12.3 +- 2.5 keV and 10^9 photons per shot in the whole spectrum., Comment: 3 pages, 3 figures

Published
2011
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3. Demonstration of the synchrotron-type spectrum of laser-produced Betatron radiation

Author

Fourmaux, S., Corde, S., Phuoc, K. Ta, Leguay, P. M., Payeur, S., Lassonde, P., Gnedyuk, S., Lebrun, G., Fourment, C., Malka, V., Sebban, S., Rousse, A., and Kieffer, J. C.

Subjects
Physics - Plasma Physics
Abstract

Betatron X-ray radiation in laser-plasma accelerators is produced when electrons are accelerated and wiggled in the laser-wakefield cavity. This femtosecond source, producing intense X-ray beams in the multi kiloelectronvolt range has been observed at different interaction regime using high power laser from 10 to 100 TW. However, none of the spectral measurement performed were at sufficient resolution, bandwidth and signal to noise ratio to precisely determine the shape of spectra with a single laser shot in order to avoid shot to shot fluctuations. In this letter, the Betatron radiation produced using a 80 TW laser is characterized by using a single photon counting method. We measure in single shot spectra from 8 to 21 keV with a resolution better than 350 eV. The results obtained are in excellent agreement with theoretical predictions and demonstrate the synchrotron type nature of this radiation mechanism. The critical energy is found to be Ec = 5.6 \pm 1 keV for our experimental conditions. In addition, the features of the source at this energy range open novel perspectives for applications in time-resolved X-ray science., Comment: 5 pages, 4 figures

Published
2011
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7. Thomson parabola and time-of-flight detector cross-calibration methodology on the ALLS 100 TW laser-driven ion acceleration beamline

Author

Vallières, S., primary, Salvadori, M., additional, Puyuelo-Valdes, P., additional, Payeur, S., additional, Fourmaux, S., additional, Consoli, F., additional, Verona, C., additional, d’Humières, E., additional, Chicoine, M., additional, Roorda, S., additional, Schiettekatte, F., additional, and Antici, P., additional

Published
2020
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12. High field physics at ALLS

Author

Lachapelle, A., additional, Otani, K., additional, Fourmaux, S., additional, Payeur, S., additional, Glesser, M., additional, MacLean, S., additional, and Kieffer, J. C., additional

Published
2015
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13. Investigation of laser-driven proton acceleration using ultra-short, ultra-intense laser pulses

Author

Fourmaux, S., primary, Buffechoux, S., additional, Albertazzi, B., additional, Capelli, D., additional, Lévy, A., additional, Gnedyuk, S., additional, Lecherbourg, L., additional, Lassonde, P., additional, Payeur, S., additional, Antici, P., additional, Pépin, H., additional, Marjoribanks, R. S., additional, Fuchs, J., additional, and Kieffer, J. C., additional

Published
2013
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18. All-optical Betatron and Compton x-ray sources and application to phase contrast imaging

Author

Corde, Sébastien, primary, Ta Phuoc, Kim, additional, Fourmaux, Sylvain, additional, Thaury, Cédric, additional, Lassonde, Philippe, additional, Lebrun, G., additional, Payeur, S., additional, Martin, F., additional, Shah, R., additional, Sebban, Stéphane, additional, Malka, Victor, additional, Kieffer, Jean Claude, additional, and Rousse, Antoine, additional

Published
2012
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24. Laser-based proton acceleration experiments at the ALLS facility using a 200 TW high intensity laser system

Author

Fourmaux, S., primary, Buffechoux, S., additional, Albertazzi, B., additional, Gnedyuk, S., additional, Lecherbourg, L., additional, Payeur, S., additional, Audebert, P., additional, Houde, D., additional, Marjoribanks, R., additional, Martin, F., additional, Pépin, H., additional, Fuchs, J., additional, and Kieffer, J. C., additional

Published
2010
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36. Enquêtes en milieu rural effectuées en Guinée Bissau par le service suivi-évaluation du projet de développement rural. Zone 2 (régions de l'Est)

Author

Payeur, S.

Subjects
Structure d'exploitation agricole, Indicateur économique, Enquête, Méthode statistique, E14 - Economie et politique du développement, Système d'exploitation agricole
Abstract

L'étude avait pour objectifs de collecter des données statistiques agricoles fiables sur la zone considérée, de caractériser les exploitations et les systèmes de production, enfin d'évaluer l'impact de certains thèmes techniques du projet (traction animale...)

Published
1988

37. All-optical Betatron and Compton x-ray sources and application to phase contrast imaging.

Author

Corde, S., Phuoc, K. Ta, Fourmaux, S., Thaury, C., Lassonde, P., Lebrun, G., Payeur, S., Martin, F., Shah, R. C., Sebban, S., Malka, V., Kieffer, J. C., and Rousse, A.

Abstract

Bright femtosecond x-ray beams, with energies up to a few hundreds of keV, have been produced from Betatron oscillations and Compton scattering in a laser-plasma accelerator. The potential of Betatron radiation for phase contrast imaging has been demonstrated. [ABSTRACT FROM PUBLISHER]

Published
2012

38. Thomson parabola and time-of-flight detector cross-calibration methodology on the ALLS 100 TW laser-driven ion acceleration beamline

Author

Sjoerd Roorda, S. Vallières, Patrizio Antici, Martin Chicoine, Claudio Verona, Emmanuel d'Humières, Sylvain Fourmaux, S. Payeur, Pilar Puyuelo-Valdes, François Schiettekatte, Fabrizio Consoli, M. Salvadori, Vallieres, S., Salvadori, M., Puyuelo-Valdes, P., Payeur, S., Fourmaux, S., Consoli, F., Verona, C., D'Humieres, E., Chicoine, M., Roorda, S., Schiettekatte, F., Antici, P., Centre d'Etudes Lasers Intenses et Applications (CELIA), Université de Bordeaux (UB)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Bordeaux (UB), and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Thomson spectrometer. Time Of flight, Proton, Physics::Instrumentation and Detectors, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], 01 natural sciences, Linear particle accelerator, 010305 fluids & plasmas, law.invention, Nuclear physics, law, 0103 physical sciences, Calibration, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment, Instrumentation, Settore FIS/01, 010302 applied physics, Physics, Time of flight detector, Spectrometer, Thomson spectrometer. Time Of flight, diamond detectors, Laser, Beamline, Physics::Accelerator Physics, diamond detectors, Microchannel plate detector
Abstract

International audience; We report on the cross-calibration of Thomson Parabola (TP) and Time-of-Flight (TOF) detectors as particle diagnostics, implemented on the most recent setup of the ALLS 100 TW laser-driven ion acceleration beamline. The Microchannel Plate (MCP) used for particle detection in the TP spectrometer has been calibrated in intensity on the tandem linear accelerator at the Université de Montréal. The experimental data points of the scaling factor were obtained by performing a pixel cluster analysis of single proton impacts on the MCP. A semi-empirical model was extrapolated and fitted to the data to apply the calibration also to higher kinetic energies and to extend it to other ion species. Two TOF lines using diamond detectors, placed at +6° and −9° with respect to the target-normal axis, were benchmarked against the TP spectrometer measurements to determine the field integrals related to its electric and magnetic dispersions. The mean integral proton numbers obtained on the beamline were about 4.1 × 1011 protons/sr with a standard deviation of 15% in the central section of the spectrum around 3 MeV, hence witnessing the high repeatability of the proton bunch generation. The mean maximum energy was of 7.3 ± 0.5 MeV, well in agreement with similar other 100 TW-scale laser facilities, with the best shots reaching 9 MeV and nearly 1012 protons/sr. The used particle diagnostics are compatible with the development of a high-repetition rate targetry due to their fast online readout and are therefore a crucial step in the automation of any beamline

Published
2020

39. Relativistic Electrons from Vacuum Laser Acceleration Using Tightly Focused Radially Polarized Beams.

Author

Powell J, Jolly SW, Vallières S, Fillion-Gourdeau F, Payeur S, Fourmaux S, Lytova M, Piché M, Ibrahim H, MacLean S, and Légaré F

Abstract

We generate a tabletop pulsed relativistic electron beam at 100 Hz repetition rate from vacuum laser acceleration by tightly focusing a radially polarized beam into a low-density gas. We demonstrate that strong longitudinal electric fields at the focus can accelerate electrons up to 1.43 MeV by using only 98 GW of peak laser power. The electron energy is measured as a function of laser intensity and gas species, revealing a strong dependence on the atomic ionization dynamics. These experimental results are supported by numerical simulations of particle dynamics in a tightly focused configuration that take ionization into consideration. For the range of intensities considered, it is demonstrated that atoms with higher atomic numbers like krypton can favorably inject electrons at the peak of the laser field, resulting in higher energies and an efficient acceleration mechanism that reaches a significant fraction (≈14%) of the theoretical energy gain limit.

Published
2024
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40. Tight-focusing parabolic reflector schemes for petawatt lasers.

Author

Vallières S, Fillion-Gourdeau F, Payeur S, Powell J, Fourmaux S, Légaré F, and Maclean S

Abstract

A comparative study of three different tight-focusing schemes for high-power lasers is performed numerically. Using the Stratton-Chu formulation, the electromagnetic field in the vicinity of the focus is evaluated for a short-pulse laser beam incident upon an on-axis high numerical aperture parabola (HNAP), an off-axis parabola (OAP), and a transmission parabola (TP). Linearly- and radially-polarized incident beams are considered. It is demonstrated that while all the focusing configurations yield intensities above 10 23 W/cm 2 for a 1 PW incident beam, the nature of the focused field can be drastically modified. In particular, it is shown that the TP, with its focal point behind the parabola, actually converts an incoming linearly-polarized beam into an m = 2 vector beam. The strengths and weaknesses of each configuration are discussed in the context of future laser-matter interaction experiments. Finally, a generalization of NA calculations up to 4π-illumination is proposed through the solid angle formulation, providing a universal way to compare light cones from any kind of optics.

Published
2023
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41. Combined laser-based X-ray fluorescence and particle-induced X-ray emission for versatile multi-element analysis.

Author

Puyuelo-Valdes P, Vallières S, Salvadori M, Fourmaux S, Payeur S, Kieffer JC, Hannachi F, and Antici P

Abstract

Particle and radiation sources are widely employed in manifold applications. In the last decades, the upcoming of versatile, energetic, high-brilliance laser-based sources, as produced by intense laser-matter interactions, has introduced utilization of these sources in diverse areas, given their potential to complement or even outperform existing techniques. In this paper, we show that the interaction of an intense laser with a solid target produces a versatile, non-destructive, fast analysis technique that allows to switch from laser-driven PIXE (Particle-Induced X-ray Emission) to laser-driven XRF (X-ray Fluorescence) within single laser shots, by simply changing the atomic number of the interaction target. The combination of both processes improves the retrieval of constituents in materials and allows for volumetric analysis up to tens of microns and on cm 2 large areas up to a detection threshold of ppms. This opens the route for a versatile, non-destructive, and fast combined analysis technique.

Published
2021
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42. Efficient spectral-step expansion of a filamenting laser pulse.

Author

Théberge F, Lassonde P, Payeur S, Châteauneuf M, Dubois J, and Kieffer JC

Abstract

We report an efficient transfer of 800 nm energy into both the ultraviolet and the far infrared (IR) during the filamentation in air of an appropriately shaped laser pulse. The multiorder enhancement of the IR supercontinuum in the 3-5 μm atmospheric transmission windows was achieved thanks to spectral-step cascaded four-wave mixing occurring within the spectrum of the shaped femtosecond laser pulse. These results also point out the limit of the self-phase modulation model to explain the spectral broadening of a filamenting laser pulse.

Published
2013
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43. Investigation of the thermally induced laser beam distortion associated with vacuum compressor gratings in high energy and high average power femtosecond laser systems.

Author

Fourmaux S, Serbanescu C, Lecherbourg L, Payeur S, Martin F, and Kieffer JC

Subjects
Computer Simulation, Light, Microscopy, Fluorescence, Multiphoton, Models, Theoretical, Time Factors, Vacuum, Equipment Design, Equipment Failure Analysis, Lasers, Optics and Photonics methods
Abstract

We report successful compensation of the thermally induced laser beam distortion associated with high energy 110 mJ and high average power femtosecond laser system of 11 Watts operated with vacuum compressor gratings. To enhance laser-based light source brightness requires development of laser systems with higher energy and higher average power. Managing the high thermal loading on vacuum optical components is a key issue in the implementation of this approach. To our knowledge this is the first time that such thermal induced distortions on the vacuum compressor gratings are characterized and compensated.

Published
2009
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