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109 results on '"Tommaso Vinci"'

101. Link between laboratory and astrophysical radiative shocks

Author

Michel Koenig, Berenice Loupias, Tommaso Vinci, Emeric Falize, Serge Bouquet, Claire Michaut, C. Cavet, Laboratoire Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Théorique et Appliquée (DPTA), 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), 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), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Saclay-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), 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), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)

Subjects
History, Work (thermodynamics), Astrophysical radiative shocks, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, laboratory astrophysics, Lambda, 01 natural sciences, Education, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], 0103 physical sciences, Radiative transfer, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, 010308 nuclear & particles physics, Astrophysics (astro-ph), Function (mathematics), Link (geometry), Plasma, Computer Science Applications, Shock (mechanics), Computational physics, accretion shocks, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience; This work provides analytical solutions describing the post-shock structure of radiative shocks growing in astrophysics and in laboratory. The equations including a cooling function Lambda vprop epsilon rhozeta xtheta are solved for any values of the exponents epsilon, zeta and theta. This modeling is appropriate to astrophysics as the observed radiative shocks arise in optically thin media. In contrast, in laboratory, radiative shocks performed using high-power lasers present a radiative precursor because the plasma is more or less optically thick. We study the post-shock region in the laboratory case and compare with astrophysical shock structure. In addition, we attempt to use the same equations to describe the radiative precursor, but the cooling function is slightly modified. In future experiments we will probe the PSR using X-ray diagnostics. These new experimental results will allow to validate our astrophysical numerical codes.

Published
2008
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102. Laboratory astrophysics using high energy lasers: need for 2D simulation

Author

Wigen Nazarov, C. Michaut, Christopher D. Gregory, Tommaso Vinci, Alessandra Benuzzi-Mounaix, Nigel Woolsey, J. Howe, M. Koenig, Berenice Loupias, Emeric Falize, Norimasa Ozaki, Stefano Atzeni, Serge Bouquet, Angelo Schiavi, and Ryosuke Kodama

Subjects
Physics, History, Jet (fluid), Theoretical physics, High energy, business.industry, law, Aerospace engineering, business, Laser, Computer Science Applications, Education, law.invention
Abstract

A certain number of experiments have been performed and planned for the future aiming to reproduce in a laboratory common astrophysical situations [1]. Among those, astrophysical jets have been the subject of elaborate studies in both theory [2] and observations [3]. Nevertheless, they still raise problems such as the 'jet collimation'. Two different approaches have been recently proposed and investigated: Vfoil [4] and Foam filled cones [5]. We present here the numerical approach to simulate such phenomena to better understand the mechanism underneath the jet formation. Numerical simulations can serve also as useful tool to guide decisions regarding the future experiments.

Published
2008
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103. Observation of collapsing radiative shocks in laboratory experiments

Author

A.B. Reighard, Ted Perry, T. R. Boehly, L. Boireau, R. P. Drake, S. G. Glendinning, Michael Grosskopf, Serge Bouquet, M. Koenig, Bruce Remington, Eric Harding, Tommaso Vinci, K. K. Dannenberg, J. P. Knauer, D.J. Kremer, J. A. Greenough, David R. Leibrandt, Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Lawrence Livermore National Laboratory (LLNL), Laboratory for Laser Energetics, Département de Physique Théorique et Appliquée (DPTA), 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), Laboratoire Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire pour l'utilisation des lasers intenses (LULI), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Shock wave, Physics, Astrophysics::High Energy Astrophysical Phenomena, chemistry.chemical_element, Plasma, Radiation, Condensed Matter Physics, Laser, Computational physics, Shock (mechanics), law.invention, Xenon, chemistry, law, Radiative transfer, Astrophysical plasma, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience; This article reports the observation of the dense, collapsed layer produced by a radiative shock in a laboratory experiment. The experiment uses laser irradiation to accelerate a thin layer of solid-density material to above 100 km/s, the first to probe such high velocities in a radiative shock. The layer in turn drives a shock wave through a cylindrical volume of Xe gas (at ~6 mg/cm3). Radiation from the shocked Xe removes enough energy that the shocked layer increases in density and collapses spatially. This type of system is relevant to a number of astrophysical contexts, providing the potential to observe phenomena of interest to astrophysics and to test astrophysical computer codes.

Published
2006
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104. Publisher’s Note: 'Temperature and electron density measurements on laser driven radiative shocks' [Phys. Plasmas 13, 010702 (2006)]

Author

M. Koenig, Tommaso Vinci, Serge Bouquet, L. Boireau, D. Batani, S. Leygnac, C. Michaut, Olivier Peyrusse, Alessandra Benuzzi-Mounaix, 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 Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Théorique et Appliquée (DPTA), 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), 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), and Università degli Studi di Milano-Bicocca = University of Milano-Bicocca (UNIMIB)

Subjects
Shock wave, Physics, Electron density, Waves in plasmas, Plasma, Condensed Matter Physics, Laser, law.invention, law, Radiative transfer, Electron temperature, Plasma diagnostics, Atomic physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience; Not Available

Published
2006
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105. Temperature and electron density measurements on laser driven radiative shocks

Author

C. Michaut, M. Koenig, Alessandra Benuzzi-Mounaix, L. Boireau, D. Batani, Serge Bouquet, S. Leygnac, Olivier Peyrusse, and Tommaso Vinci

Subjects
Shock wave, Physics, Electron density, chemistry.chemical_element, Plasma, Condensed Matter Physics, Laser, law.invention, Xenon, chemistry, law, Radiative transfer, Electron temperature, Plasma diagnostics, Atomic physics
Abstract

In this paper, new results on radiative shocks generated by a high power laser in a xenon gas cell are presented. Several shock parameters were measured: temperature, radial expansion and velocity, as well as the electron density in the radiative precursor and its velocity. Multiple laser shot allowed the investigation of physical trends changing initial conditions (laser energy and initial gas pressure). Results are compared with one- and two-dimensional radiative hydrodynamic simulations. The experiments were carried out at the LULI Laboratory.

Published
2006
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106. Study of target heating induced by fast electrons in mass limited targets.

Author

Alessio, Morace, Alexander, Magunov, Dimitri, Batani, Renato, Redaelli, Claude, Fourment, Jorge, Santos Joao, Gerard, Malka, Alain, Boscheron, Alexis, Casner, Wigen, Nazarov, Tommaso, Vinci, Yasuaki, Okano, Yuichi, Inubushi, Hiroaki, Nishimura, Alessandro, Flacco, Chris, Spindloe, and Martin, Tolley

Subjects
PLASMA heating, WAVELENGTHS, X-rays, RADIATION, LASERS
Abstract

We studied the induced plasma heating in three different kind of targets: mass limited, foam targets and large mass targets. The experiment was performed at Alisé laser facility of CEA/CESTA. The laser system emitted a ∼1-ps pulse with ∼10 J energy at a wavelength of ∼1 μm. Mass limited targets had three layers with thickness 10 μm C8H8, 1 μm C8H7Cl, 10 μm C8H8 with size 100 μm×100 μm. Detailed spectroscopic analysis of X-rays emitted from the Cl tracer showed that it was possible to heat up the plasma mass limited targets to a temperature ∼250 eV with density ∼1021 cm-3. The plasma heating is only produced by fast electron transport in the target, being the 10 μm C8H8 overcoating thick enough to prevent any possible direct irradiation of the tracer layer even taking into account mass-ablation due to the pre-pulse. These results demonstrate that with mass limited targets is possible to generate a plasma heated up to several hundreds eV. It is also very important for research concerning high energy density phenomena and for fast ignition (in particular for the study of fast electrons transport and induced heating). [ABSTRACT FROM AUTHOR]

Published
2010
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107. Equations of state data of plastic foams obtained from laser driven shocks at PALS (Prague Asterix Laser System)

Author

G. Lucchini, Michaela Kozlova, M. Soukup, Bedřich Rus, F. Canova, M. Stupka, Tommaso Vinci, Jiri Polan, P. Homer, Takayoshi Norimatsu, A. R. Praeg, D. Batani, R. Dudzak, R. Dezulian, R. Redaelli, T. Havlíček, Miroslav Pfeifer, S. Barbanotti, Hiroaki Nishimura, F. Ito, E. Krousky, Keiji Nagai, Jiri Skala, and F. Orsenigo

Subjects
Shock wave, Range (particle radiation), Materials science, business.industry, ASTERIX, Plasma, Laser, law.invention, Synthetic materials, Wavelength, Optics, law, Low density, business
Abstract

We present Hugoniot data for plastic foams with initial density in the range 60 – 130 mg/cm3, obtained with laser‐driven shocks propagating in double layer Al/foam targets. The experiment was performed using the Prague PALS iodine laser working at 0.44 μm wavelength and irradiances up to a few 1014 W/cm2. Pressures as high as 3.6 Mbar (previously unreached for such low density materials) were generated in the foams.

108. Time-resolved analysis of high-power-laser produced plasma expansion in vacuum

Author

Victor Malka, Alessandra Benuzzi-Mounaix, D. Batani, Tommaso Vinci, M. Koenig, Abutrab Aliverdiev, and R. Dezulian

Subjects
Physics, Electron density, Streak photography, business.industry, Time resolution, Plasma, Laser, law.invention, Power (physics), Interferometry, Optics, law, Irradiation, business
Abstract

Here we consider the results of an experimental investigation of the temporal evolution of plasmas produced by high power laser irradiation of various types of target materials. The experiment was performed at the LULI Laboratory (Ecole Polytechnique, Paris). We have developed a method to analyze time‐resolved streak‐camera images and analyzed a number of results obtained with various materials.

109. Time-resolved analysis of high-power-laser produced plasma expansion

Author

R. Dezulian, M. Koenig, Tommaso Vinci, Alessandra Benuzzi-Mounaix, Abutrab Aliverdiev, D. Batani, and Victor Malka

Subjects
Materials science, law, Optical measurements, Plasma diagnostics, Irradiation, Plasma, Atomic physics, Laser, Power (physics), law.invention
Abstract

We consider the results of an experimental investigation of the temporal evolution of plasmas produced by high power laser irradiation of various materials. The experiment was done at the LULI Laboratory (Ecole Polytechnique, Paris). A comparative analysis is presented.

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