Author Affiliations
Abstract
1 LULI - CNRS, Ecole Polytechnique, CEA: Université Paris-Saclay; UPMC Univ Paris 06: Sorbonne Universités - F-91128 Palaiseau cedex, France
2 CEA-DAM-DIF, F-91297 Arpajon, France
3 CEA Saclay, DSM/Irfu/Service d’Astrophysique, F-91191 Gif-sur-Yvette, France
4 Helmholtz-Zentrum Dresden – Rossendorf HZDR, Bautzner Landstraße 400, 01328 Dresden, Germany
5 Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI 48109, USA
6 Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
7 JIHT-RAS, 13-2 Izhorskaya st., Moscow 125412, Russia
8 National Research Nuclear University MEPhI, Moscow 115409, Russia
9 Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK
10 Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan
11 LUTH, Observatoire de Paris, UMR CNRS 8102, Université Paris Diderot, 92190 Meudon, France
12 Department of Energy Engineering Science, Faculty of Engineering Sciences, Kyushu University, Japan
13 General Atomics, San Diego, CA 92121, USA
14 Plasma Science and Fusion Center, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
15 Flash Center for Computational Science, University of Chicago, IL 60637, USA
The influence of a strong external magnetic field on the collimation of a high Mach number plasma flow and its collision with a solid obstacle is investigated experimentally and numerically. The laser irradiation () of a multilayer target generates a shock wave that produces a rear side plasma expanding flow. Immersed in a homogeneous 10 T external magnetic field, this plasma flow propagates in vacuum and impacts an obstacle located a few mm from the main target. A reverse shock is then formed with typical velocities of the order of 15–20 5 km/s. The experimental results are compared with 2D radiative magnetohydrodynamic simulations using the FLASH code. This platform allows investigating the dynamics of reverse shock, mimicking the processes occurring in a cataclysmic variable of polar type.
accretion processes high-power laser hydrodynamics laboratory astrophysics polar radiative shocks 
High Power Laser Science and Engineering
2018, 6(3): 03000e43
Author Affiliations
Abstract
1 IUNAT, Departamento de Física, Universidad de Las Palmas de Gran Canaria, 35017 Las Palmas de Gran Canaria, Spain
2 Instituto de Fusión Nuclear, Universidad Politécnica de Madrid, 28040 Madrid, Spain
3 Blackett Laboratory, Imperial College, London SW7 2AZ, UK
4 LERMA, Sorbonne Universités, UPMC, Observatoire de Paris, PSL Research University, CNRS, F-75006 Paris, France
5 AWE, Aldermaston, Reading RG7 4PR, UK
In this work we have conducted a study on the radiative and spectroscopic properties of the radiative precursor and the post-shock region from experiments with radiative shocks in xenon performed at the Orion laser facility. The study is based on post-processing of radiation-hydrodynamics simulations of the experiment. In particular, we have analyzed the thermodynamic regime of the plasma, the charge state distributions, the monochromatic opacities and emissivities, and the specific intensities for plasma conditions of both regions. The study of the intensities is a useful tool to estimate ranges of electron temperatures present in the xenon plasma in these experiments and the analysis performed of the microscopic properties commented above helps to better understand the intensity spectra. Finally, a theoretical analysis of the possibility of the onset of isobaric thermal instabilities in the post-shock has been made, concluding that the instabilities obtained in the radiative-hydrodynamic simulations could be thermal ones due to strong radiative cooling.
high-power lasers laboratory experiments on radiative shocks plasma radiative properties spectroscopy. 
High Power Laser Science and Engineering
2018, 6(2): 02000e36

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