Supersonic jet and shock interactions
John Foster,Bernhard H. Wilde,Paula Rosen,Ted Perry,M. Fell,Melissa Edwards,Barbara F. Lasinski,R. E. Turner,M. L. Gittings +8 more
TLDR
Soures et al. as discussed by the authors investigated the propagation of a structured shock front within a radiation-driven target assembly, the formation of a supersonic jet of material, and the subsequent interaction of this jet with an ambient medium in which a second, ablatively driven shock wave is propagating.Abstract:
Supersonic fluid flow and the interaction of strong shock waves to produce jets of material are ubiquitous features of inertial confinement fusion (ICF), astrophysics, and other fields of high energy-density science. The availability of large laser systems provides an opportunity to investigate such hydrodynamic systems in the laboratory, and to test their modeling by radiation hydrocodes. We describe experiments to investigate the propagation of a structured shock front within a radiation-driven target assembly, the formation of a supersonic jet of material, and the subsequent interaction of this jet with an ambient medium in which a second, ablatively driven shock wave is propagating. The density distribution within the jet, the Kelvin–Helmholz roll-up at the tip of the jet, and the jet’s interaction with the counterpropagating shock are investigated by x-ray backlighting. The experiments were designed and modeled using radiation hydrocodes developed by Los Alamos National Laboratory, AWE, and Lawrence Livermore National Laboratory. The same hydrocodes are being used to model a large number of other ICF and high energy-density physics experiments. Excellent agreement between the different simulations and the experimental data is obtained, but only when the full geometry of the experiment, including both laser-heated hohlraum targets (driving the jet and counter-propagating shock), is included. The experiments were carried out at the University of Rochester’s Omega laser [J. M. Soures et al., Phys. Plasmas 3, 2108 (1996)].read more
Citations
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Experimental astrophysics with high power lasers and Z pinches
TL;DR: High energy density (HED) laboratory astrophysics as discussed by the authors is a new class of experimental science, wherein the properties of matter and the processes that occur under extreme astrophysical conditions can be examined in the laboratory.
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The RAGE radiation-hydrodynamic code
Michael Gittings,Robert P. Weaver,Michael Clover,Thomas Betlach,Nelson Byrne,Robert Coker,Edward D. Dendy,R. M. Hueckstaedt,Kim New,W Rob Oakes,Dale Ranta,Ryan Stefan +11 more
TL;DR: RAGE, the 'radiation adaptive grid Eulerian' radiation-hydrodynamics code, is described, including its data structures, its parallelization strategy and performance, its hydrodynamic algorithm(s), its (gray) radiation diffusion algorithm, and some of the considerable amount of verification and validation efforts.
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The National Ignition Facility: enabling fusion ignition for the 21st century
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The National Ignition Facility
TL;DR: The National Ignition Facility (NIF) at Lawrence Livermore National Laboratory is a stadium-sized facility that, when completed in 2008, will contain a 192-beam, 1.8-megajoule, 500-terawatt, ultraviolet laser system together with a 10m-diam target chamber and room for 100 diagnostics as discussed by the authors.
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Architecture of petawatt-class z-pinch accelerators.
William A. Stygar,M. E. Cuneo,Daniel Headley,H. C. Ives,R. J. Leeper,Michael G. Mazarakis,Craig L. Olson,John L. Porter,T. C. Wagoner,Joseph Ray Woodworth +9 more
TL;DR: In this article, an accelerator architecture that can serve as the basis of the design of petawatt-class $z$-pinch drivers is presented. But it does not include intermediate store transmission lines, multimegavolt gas switches, or a laser trigger system.
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