Effects of microstructure on shock propagation in foams
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In this paper, the effects of foam heterogeneity leads to increased shock velocity and reduced compressibility, and evidence of this effect is obtained using two-dimensional adaptive mesh refinement Eulerian numerical simulations.Abstract:
Foams are an important component of various inertial confinement fusion target schemes. The propagation of shock waves in foams is also an important issue for many other laser experiments (e.g., laboratory astrophysics experiments). The usual approach is to assume that the foam can be considered as a homogeneous mixture. Taking into account the effects of foam heterogeneity leads to increased shock velocity and reduced compressibility. Evidence of this effect is obtained using two-dimensional adaptive mesh refinement Eulerian numerical simulations. Nonetheless, for the very low density foams filled with DT ice used in recent direct drive target designs, the homogeneous mixture model provides adequate shock timing, density, and pressure profiles.read more
Citations
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Journal ArticleDOI
High-gain direct-drive target design for the Laser Mégajoule
B. Canaud,X. Fortin,F. Garaude,C. Meyer,F. Philippe,Mauro Temporal,Stefano Atzeni,Angelo Schiavi +7 more
TL;DR: In this article, a CH-foam ablator filled with cryogenic deuterium-tritium is used for direct-drive target design in the context of the French Laser-Mfusion research program, and the hydrodynamic stability of the implosion is investigated at the ablation front and the hot-spot surface.
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Experimental evidence of foam homogenization
Ph. Nicolaï,M. Olazabal-Loumé,Shinsuke Fujioka,Atsushi Sunahara,N.G. Borisenko,S. Gus'kov,A. Orekov,Mickael Grech,G. Riazuelo,C. Labaune,J. Velechowski,Vladimir Tikhonchuk +11 more
TL;DR: In this paper, the propagation of an ionization wave through a subcritical foam is studied under inertial confinement fusion conditions, and independent measurements of the wave velocity are compared with hydrodynamic simulations and analytical models.
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Electrostatic field distribution at the sharp interface between high density matter and vacuum
Maurizio Lontano,Matteo Passoni +1 more
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Low initial aspect-ratio direct-drive target designs for shock- or self-ignition in the context of the laser Megajoule
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Shock propagation in deuterium-tritium-saturated foam
TL;DR: Adaptive-mesh-refinement hydrodynamic simulations have been performed of cross sections of fibrous foams saturated with cryogenic deuterium and tritium (DT), and material tracking indicates that the fibers and DT mix rapidly behind the shock.
References
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Journal ArticleDOI
A review of astrophysics experiments on intense lasers
TL;DR: In this article, the authors summarize several areas of astrophysics: supernovae, supernova remnants, gamma-ray bursts, and giant planets, and show that experiments are under development at intense laser facilities to test and refine our understanding of these phenomena.
Journal ArticleDOI
The dynamics of shock accelerated light and heavy gas cylinders
TL;DR: In this article, it is found that the vorticity deposited on the boundary of a laminar jet of helium or sulphur hexafluoride (SF6) cylinder by the interaction with the shock wave, separates from the heavy gas to form a pair of vortices, which subsequently wrap the SF6 around them.
Journal ArticleDOI
Indirect-drive noncryogenic double-shell ignition targets for the National Ignition Facility: Design and analysis
Peter Amendt,Jeff Colvin,Robert Tipton,D. E. Hinkel,M. J. Edwards,Otto Landen,John D. Ramshaw,L. J. Suter,W. S. Varnum,R. G. Watt +9 more
TL;DR: In this paper, the analysis and design of indirect-drive National Ignition Facility double-shell targets with hohlraum temperatures of 200 eV and 250 eV are presented.
Journal ArticleDOI
Direct drive cryogenic ICF capsules employing D-T wetted foam
R.A. Sacks,D.H. Darling +1 more
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Journal ArticleDOI
A quantitative study of the interaction of two Richtmyer-Meshkov-unstable gas cylinders
Christopher Tomkins,Kathy Prestridge,Paul Rightley,Mark Marr-Lyon,Peter Vorobieff,Robert F. Benjamin +5 more
TL;DR: In this paper, the authors investigate the evolution and interaction of two Richtmyer-Meshkov-unstable gas cylinders using concentration field visualization and particle image velocimetry.