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4 results on '"B. Khiar"'

1. Laser-Produced Magnetic-Rayleigh-Taylor Unstable Plasma Slabs in a 20 T Magnetic Field

Author

J. Béard, S. S. Makarov, Andrea Ciardi, Shihua Chen, Mirela Cerchez, E. D. Filippov, T. Gangolf, B. Khiar, G. Revet, S. A. Pikuz, Oswald Willi, M. Ouillé, A. A. Soloviev, Julien Fuchs, M. Safronova, K. F. Burdonov, M. V. Starodubtsev, I. Yu. Skobelev, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), 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 National des Champs Magnétiques Pulsés (LNCMP), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Institute of Applied Physics (IAP, Nizhny Novgorod), Institut für Laser und Plasmaphysik, Heinrich Heine Universität Düsseldorf = Heinrich Heine University [Düsseldorf], Joint Institute for High Temperatures of the RAS (JIHT), Russian Academy of Sciences [Moscow] (RAS), 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), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Lobachevsky State University [Nizhni Novgorod], Laboratoire national des champs magnétiques intenses - Toulouse (LNCMI-T), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Horia Hulubei National Institute of Physics and Nuclear Engineering (NIPNE), IFIN-HH, ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), ANR-10-EQPX-0029,EQUIP@MESO,Equipement d'excellence de calcul intensif de Mesocentres coordonnés - Tremplin vers le calcul petaflopique et l'exascale(2010), ANR-11-LABX-0062,PLAS@PAR,PLASMAS à PARIS, au delà des frontières(2011), European Project: 787539,GENESIS - 10.3030/787539, and Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

Subjects
General Physics and Astronomy, FOS: Physical sciences, 01 natural sciences, Instability, Collimated light, law.invention, Physics::Fluid Dynamics, symbols.namesake, law, Physics::Plasma Physics, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], 0103 physical sciences, Rayleigh scattering, 010306 general physics, Inertial confinement fusion, ComputingMilieux_MISCELLANEOUS, Physics, Condensed matter physics, Plasma, Laser, Physics - Plasma Physics, Magnetic field, Plasma Physics (physics.plasm-ph), Physics::Space Physics, Slab, symbols
Abstract

Magnetized laser-produced plasmas are central to many novel laboratory astrophysics and inertial confinement fusion studies, as well as in industrial applications. Here we provide the first complete description of the three-dimensional dynamics of a laser-driven plasma plume expanding in a 20 T transverse magnetic field. The plasma is collimated by the magnetic field into a slender, rapidly elongating slab, whose plasma-vacuum interface is unstable to the growth of the "classical", fluid-like magnetized Rayleigh-Taylor instability., Comment: Accepted for publication in Physical Review Letters

Published
2019
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2. Dynamics of Nanosecond Laser Pulse Propagation and of Associated Instabilities in a Magnetized Underdense Plasma.

Author

Yao W, Higginson A, Marquès JR, Antici P, Béard J, Burdonov K, Borghesi M, Castan A, Ciardi A, Coleman B, Chen SN, d'Humières E, Gangolf T, Gremillet L, Khiar B, Lancia L, Loiseau P, Ribeyre X, Soloviev A, Starodubtsev M, Wang Q, and Fuchs J

Subjects
Heart Rate, Kinetics, Lasers, Electrons, Heating
Abstract

The propagation and energy coupling of intense laser beams in plasmas are critical issues in inertial confinement fusion. Applying magnetic fields to such a setup has been shown to enhance fuel confinement and heating. Here we report on experimental measurements demonstrating improved transmission and increased smoothing of a high-power laser beam propagating in a magnetized underdense plasma. We also measure enhanced backscattering, which our kinetic simulations show is due to magnetic confinement of hot electrons, thus leading to reduced target preheating.

Published
2023
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3. Inefficient Magnetic-Field Amplification in Supersonic Laser-Plasma Turbulence.

Author

Bott AFA, Chen L, Boutoux G, Caillaud T, Duval A, Koenig M, Khiar B, Lantuéjoul I, Le-Deroff L, Reville B, Rosch R, Ryu D, Spindloe C, Vauzour B, Villette B, Schekochihin AA, Lamb DQ, Tzeferacos P, Gregori G, and Casner A

Abstract

We report a laser-plasma experiment that was carried out at the LMJ-PETAL facility and realized the first magnetized, turbulent, supersonic (Ma_{turb}≈2.5) plasma with a large magnetic Reynolds number (Rm≈45) in the laboratory. Initial seed magnetic fields were amplified, but only moderately so, and did not become dynamically significant. A notable absence of magnetic energy at scales smaller than the outer scale of the turbulent cascade was also observed. Our results support the notion that moderately supersonic, low-magnetic-Prandtl-number plasma turbulence is inefficient at amplifying magnetic fields compared to its subsonic, incompressible counterpart.

Published
2021
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4. Enhancement of Quasistationary Shocks and Heating via Temporal Staging in a Magnetized Laser-Plasma Jet.

Author

Higginson DP, Khiar B, Revet G, Béard J, Blecher M, Borghesi M, Burdonov K, Chen SN, Filippov E, Khaghani D, Naughton K, Pépin H, Pikuz S, Portugall O, Riconda C, Riquier R, Rodriguez R, Ryazantsev SN, Skobelev IY, Soloviev A, Starodubtsev M, Vinci T, Willi O, Ciardi A, and Fuchs J

Abstract

We investigate the formation of a laser-produced magnetized jet under conditions of a varying mass ejection rate and a varying divergence of the ejected plasma flow. This is done by irradiating a solid target placed in a 20 T magnetic field with, first, a collinear precursor laser pulse (10^{12}  W/cm^{2}) and, then, a main pulse (10^{13}  W/cm^{2}) arriving 9-19 ns later. Varying the time delay between the two pulses is found to control the divergence of the expanding plasma, which is shown to increase the strength of and heating in the conical shock that is responsible for jet collimation. These results show that plasma collimation due to shocks against a strong magnetic field can lead to stable, astrophysically relevant jets that are sustained over time scales 100 times the laser pulse duration (i.e., >70  ns), even in the case of strong variability at the source.

Published
2017
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