Experimental characterization of the interaction zone between counterpropagating Taylor Sedov blast waves
Autor: | Jena Meinecke, Norimasa Ozaki, Andrea Ciardi, Gianluca Gregori, Jean-Raphael Marques, Th. Michel, S. A. Pikuz, S. Ryazantsev, L. Van Box Som, Emeric Falize, P. Mabey, Bruno Albertazzi, M. Koenig, G. Rigon |
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Přispěvatelé: | 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) |
Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Shock wave
Physics [PHYS]Physics [physics] Electron density Jet (fluid) Astrophysics::High Energy Astrophysical Phenomena Molecular cloud Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Computational physics Interstellar medium Stars 13. Climate action Schlieren 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics 010306 general physics Astrophysics::Galaxy Astrophysics Blast wave |
Zdroj: | Physics of Plasmas Physics of Plasmas, American Institute of Physics, 2020, ⟨10.1063/1.5137795⟩ Physics of Plasmas, 2020, ⟨10.1063/1.5137795⟩ |
ISSN: | 1070-664X 1089-7674 |
Popis: | Astronomical observations reveal that the interaction between shock waves and/or blast waves with astrophysical objects (molecular clouds, stars, jet winds, etc.) is a common process which leads to a more intricate structure of the interstellar medium. In particular, when two isolated massive stars are relatively close and explode, the resulting Supernovae Remnants (SNRs) can interact. The impact zone presents fascinating complex hydrodynamic physics which depends on the age of the SNRs, their relative evolution stage, and the distance between the two stars. In this Letter, we investigate experimentally the interaction region (IR) formed when two blast waves (BWs) collide during their Taylor-Sedov expansion phase. The two BWs are produced by the laser irradiation (1 ns, ∼500 J) of 300 μm diameter carbon rods and propagate in different gases (Ar and N2) at different pressures. The physical parameters, such as the density and temperature of the IR, are measured for the first time using a set of optical diagnostics (interferometry, schlieren, time-resolved optical spectroscopy, etc.). This allows us to determine precisely the thermodynamic conditions of the IR. A compression ratio of r ∼ 1.75 is found and a 17–20% increase in temperature is measured compared to the shell of a single blast wave. Moreover, we observe the generation of vorticity, inducing strong electron density gradients, in the IR at long periods after the interaction. This could in principle generate magnetic fields through the Biermann Battery effect. |
Databáze: | OpenAIRE |
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