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Laboratory astrophysics with magnetized laser-produced plasmas

Abstract : We present in this work different configurations used as a mean to study astrophysically-relevant (by scaling) experiments using laser-produced plasmas and strong magnetic fields. This work is a contribution to the relatively recent field known as high energy density laboratory astrophysics (hedla). The theoretical and numerical framework used in this this work is first introduced with a detailed derivation of the magnetohydrodynamic (mhd) model for bi-temperature and resistive plasmas. The three-dimensional mhd code gorgon and the new physical modules implemented during this thesis are presented. The basic setup studied here involve one or several solid slabs being used as targets for a joule-class laser. The expanding plasma thus produced is embedded in magnetic fields of strengths up to 40 t. Depending on the orientation of the field relative to the target surface, we show that the resulting plasma dynamic, relatively well described by ideal mhd, is strongly modified by the presence of the field. The first topic treated is related to the production, when the field is perpendicular to the target surface, of super-sonic/alfvenic jets relevant in the context of astrophysical jets observed around young star objects (t tauri stars). When the field is oriented parallel to the surface, we show that the configuration results in the formation of thin unstable plasma slabs. We also studied the possibility to generate magnetized accretion shocks in the laboratory and we detail the 3d structure obtained in this case. Alongise the numerical work, we present for each case mentioned previously, new experimental results obtained by the collaboration on the elfie laser facility (luli).
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  • HAL Id : tel-01699030, version 2

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Benjamin Khiar. Laboratory astrophysics with magnetized laser-produced plasmas. Astrophysics [astro-ph]. Université Pierre et Marie Curie - Paris VI, 2017. English. ⟨NNT : 2017PA066310⟩. ⟨tel-01699030v2⟩

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