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Your search keyword '"V. Silvert"' showing total 5 results
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5 results on '"V. Silvert"'

1. Simultaneous X-ray and XUV absorption measurements in nickel laser-produced plasma close to LTE

Author

V. Silvert, F. Thais, J. Fariaut, Franck Gilleron, B. Villette, M. Dozières, Charles Reverdin, Jc. Pain, S. Bastiani-Ceccotti, F. P. Condamine, D. Gilles, G. Soullié, M. Comet, Frank B. Rosmej, Thomas Blenski, M. Poirier, University of California [San Diego] (UC San Diego), University of California (UC), Matière à Haute Densité d'Energie (MHDE), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire pour l'utilisation des lasers intenses (LULI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Détection et de Géophysique (CEA) (LDG), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), European Project: 633053,H2020,EURATOM-Adhoc-2014-20,EUROfusion(2014), University of California, Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Opacity, Nuclear and High Energy Physics, Materials science, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Thermodynamic equilibrium, Electron, 01 natural sciences, 7. Clean energy, Spectral line, 010305 fluids & plasmas, law.invention, Atomic physics, X-ray, Absorption spectroscopy, law, Laser experimen, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], 0103 physical sciences, t LTE plasma, 010306 general physics, Absorption (electromagnetic radiation), [PHYS]Physics [physics], Radiation, Plasma, Laser, Laser experiment, Extreme ultraviolet, LTE plasma
Abstract

International audience; We present an experiment performed in 2016 at the LULI2000 laser facility in which X-ray and XUV absorption structures of nickel hot plasmas were measured simultaneously. Such experiments may provide stringent tests of the accuracy of plasma atomic-physics codes used to the modeling of plasmas close to local thermodynamic equilibrium. The experimental setup relies on a symmetric heating of the sample foil by two gold hohlraums in order to reduce the spatial gradients. The plasma conditions are characterized by temperatures between 10 and 20 eV and densities of the order of 10$^{−3}$ g/cm $^3$-10$^{−2}$ g/cm$^3$. For the X-ray part, we investigate the 2p-3d and 2p-4d transitions, and for the XUV part, we recorded the $\Delta$n = 0 (n = 3) transitions, which present a high sensitivity to plasma temperature. These latter transitions are of particular interest because, in mid-Z plasmas, they dominate the Planck and Rosseland mean opacities. Measured spectra are compared to calculations performed using the hybrid opacity code SCO-RCG and the Flexible Atomic Code (FAC). The influence of a spectator electron on the calculated spectra is analyzed using the latter code.

Published
2019
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2. Characterization of near-LTE, high-temperature and high-density aluminum plasmas produced by ultra-high intensity lasers

Author

C. R. D. Brown, Charles Reverdin, Jean-Christophe Pain, Christophe Rousseaux, Laurent Gremillet, Kevin Glize, V. Dervieux, L. Lecherbourg, P. Allan, Christophe P. Blancard, Berenice Loupias, V. Silvert, David Hoarty, P. Renaudin, S. D. Baton, and M. P. Hill

Subjects
Nuclear and High Energy Physics, Radiation, Materials science, High intensity lasers, chemistry.chemical_element, High density, Plasma, Laser, law.invention, Pulse (physics), Characterization (materials science), chemistry, Aluminium, law, Ionization, Atomic physics
Abstract

Ultra-high-intensity lasers have opened up a new avenue for the creation and detailed spectral measurements of dense plasmas in extreme thermodynamic conditions. In this paper, we demonstrate the possibility of heating a dense plasma (ρ > 1 gcm−3) to a maximum temperature of 560 ± 40 eV using a few-Joule, relativistic-intensity laser pulse. Particle-in-cell, radiation-hydrodynamic and atomic physics simulation tools are used together for a full description of the plasma dynamics, from laser interaction to late-time expansion and x-ray emission, yielding overall good agreement with the spectral measurements. We discuss the sensitivity of our analysis to space-time gradients, non-equilibrium ionization processes and hot electron effects.

Published
2015
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3. X-ray opacity measurements in mid-Z dense plasmas with a new target design of indirect heating

Author

G. Soullié, V. Silvert, Franck Gilleron, D. Khaghani, J. Fariaut, Thomas Blenski, M. Dozières, S. Bastiani-Ceccotti, B. Villette, F.B. Rosmej, Walter Fölsner, Jean-Christophe Pain, F. Thais, and Charles Reverdin

Subjects
Nuclear and High Energy Physics, X-ray absorption spectroscopy, Radiation, Materials science, Absorption spectroscopy, Opacity, Plasma, Laser, 7. Clean energy, 01 natural sciences, Spectral line, 010305 fluids & plasmas, law.invention, law, 0103 physical sciences, Atomic physics, 010306 general physics, Absorption (electromagnetic radiation), FOIL method
Abstract

X-ray transmission spectra of copper, nickel and aluminum laser produced plasmas were measured at the LULI2000 laser facility with an improved target design of indirect heating. Measurements were performed in plasmas close to local thermodynamic equilibrium at temperatures around 25 eV and densities between 10−3 g/cm3 and 10−2 g/cm3. This improved design provides several advantages, which are discussed in this paper. The sample is a thin foil of mid-Z material inserted between two gold cavities heated by two 300J, 2ω, nanosecond laser beams. A third laser beam irradiates a gold foil to create a spectrally continuous X-ray source (backlight) used to probe the sample. We investigate 2p–3d absorption structures in Ni and Cu plasmas as well as 1s–2p transitions in an additional Al plasma layer to infer the in-situ plasma temperature. Geometric and hydrodynamic calculations indicate that the improved geometry reduces spatial gradients during the transmission measurements. Experimental absorption spectra are in good agreement with calculations from the hybrid atomic physics code SCO-RCG.

Published
2015
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4. X-ray emission spectroscopy of well-characterised non-LTE plasmas

Author

L Vassura, P. Audebert, V. Silvert, S. Jacquemot, S. Bastiani-Ceccotti, Tommaso Vinci, Fabien Dorchies, A.-C. Bourgaux, V. Dervieux, P. M. Leguay, C. Bowen, P. Renaudin, Hyun-Kyung Chung, Jean-Raphael Marques, Laboratoire pour l'utilisation des lasers intenses (LULI), Université Pierre et Marie Curie - Paris 6 (UPMC)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Lasers Intenses et Applications (CELIA), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Bordeaux (UB), Énergie Matériaux Télécommunications - INRS (EMT-INRS), Institut National de la Recherche Scientifique [Québec] (INRS)-Université du Québec à Montréal = University of Québec in Montréal (UQAM), Groupe d'Etude de la Matière Condensée (GEMAC), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université de Bordeaux (UB)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), International Atomic Energy Agency [Vienna] (IAEA), and Dorchies, Fabien

Subjects
[PHYS]Physics [physics], History, 010504 meteorology & atmospheric sciences, Thomson scattering, Chemistry, Scattering, Astrophysics::High Energy Astrophysical Phenomena, Plasma, Inelastic scattering, 01 natural sciences, Spectral line, [PHYS] Physics [physics], Computer Science Applications, Education, law.invention, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], law, 0103 physical sciences, Emission spectrum, Atomic physics, 010306 general physics, Spectroscopy, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Pyrometer
Abstract

This paper will present an experimental platform developed on LULI2000 to measure x-ray emission of non-LTE plasmas in well-defined hydrodynamic conditions thanks to implementation of a whole set of diagnostics, including time-resolved electronic and ionic Thomson scattering and self-optical pyrometry. K-, L- and M-shell spectra will be presented and the methodology, that has been developed to analyze them, discussed.

Published
2016
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