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Exploring magnetized liner inertial fusion with a semi-analytic model

McBride, Ryan D.; Slutz, Stephen A.; Sinars, Daniel S.; Vesey, Roger A.; Gomez, Matthew R.; Sefkow, Adam B.; Hansen, Stephanie B.; Cochrane, Kyle C.; Rovang, Dean C.; Lamppa, Derek C.; Geissel, Matthias G.; Harvey-Thompson, Adam J.; Schmit, Paul S.; Knapp, Patrick K.; Awe, Thomas J.; Jennings, Christopher A.; Martin, Matthew; Peterson, Kyle J.; Rochau, G.A.; Porter, John L.; Stygar, William A.; Cuneo, M.E.

Abstract not provided.

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TYPE Conference Poster YEAR 2015
DOIOSTI

Low Adiabat Compression of Liquid Deuterium Filled Cylindrical Liners to 0.1?2 Gbar

Physical Review Letters

Knapp, Patrick K.; Martin, Matthew; Dalton, Devon D.; Laros, James H.; Davis, Jean-Paul D.; Romero, Dustin H.; Cochrane, Kyle C.; Loisel, Guillaume P.; Mattsson, Thomas M.; McBride, Ryan D.; Sinars, Daniel S.

We report on experiments where cylindrical beryllium liners filled with liquid deuterium were compressed to extreme pressure and density with current pulse shaping. In one set of experiments the pressure at stagnation is inferred to be & 100 Mbar using penetrating radiography. A peak liner convergence ratio (initial radius over final radius) of 7.6 was measured resulting in an average deuterium density of 10 g=cm3 and areal density of 0.45 g=cm2. The stagnation shock propagating radially outward through the liner wall was directly measured with a strength of ≈ 120 Mbar. In a second set of experiments the liner was imploded to a peak convergence of 19 resulting in a density of 55 g=cm3 and areal density of 0.5 g=cm2. The pressure at stagnation in this experiment is estimated to be 2 Gbar. This platform enables the study of high-pressure, high-density, implosion deceleration and stagnation dynamics at spatial scales that are readily diagnosable (R ~ 0.1 -- 0.4 mm). Thus, these experiments are directly relevant to both Inertial Con nement Fusion and the study of material properties under extreme conditions.

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TYPE Journal Article YEAR 2015
OSTIOSTI

Ethane-xenon mixtures under shock conditions

Physical Review B - Condensed Matter and Materials Physics

Magyar, Rudolph J.; Root, Seth R.; Mattsson, Thomas M.; Cochrane, Kyle C.; Flicker, Dawn G.

Mixtures of light elements with heavy elements are important in inertial confinement fusion. We explore the physics of molecular scale mixing through a validation study of equation of state (EOS) properties. Density functional theory molecular dynamics (DFT-MD) at elevated temperature and pressure is used to obtain the thermodynamic state properties of pure xenon, ethane, and various compressed mixture compositions along their principal Hugoniots. To validate these simulations, we have performed shock compression experiments using the Sandia Z-Machine. A bond tracking analysis correlates the sharp rise in the Hugoniot curve with the completion of dissociation in ethane. The DFT-based simulation results compare well with the experimental data along the principal Hugoniots and are used to provide insight into the dissociation and temperature along the Hugoniots as a function of mixture composition. Interestingly, we find that the compression ratio for complete dissociation is similar for several compositions suggesting a limiting compression for C-C bonded systems.

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TYPE Journal Article YEAR 2015
DOIOSTIScopus

On the scaling of the magnetically accelerated flyer plate technique to currents greater than 20 MA

Journal of Physics: Conference Series

Lemke, Raymond W.; Knudson, Marcus D.; Cochrane, Kyle C.; Desjarlais, Michael P.; Asay, J.R.

In this article we discuss scaling the magnetically accelerated flyer plate technique to currents greater than is available on the Z accelerator. Peak flyer plate speeds in the range 7-46 km/s are achieved in pulsed power driven, hyper-velocity impact experiments on Z for peak currents in the range 8-20 MA. The highest (lowest) speeds are produced using aluminum (aluminum-copper) flyer plates. In either case, the ≈1 mm thick flyer plate is shocklessly accelerated by magnetic pressure to ballistic speed in ≈400 ns; it arrives at the target with a fraction of material at standard density. During acceleration a melt front, due to resistive heating, moves from the drive-side toward the target-side of the flyer plate; the speed of the melt front increases with increasing current. Peak flyer speeds on Z scale quadratically (linearly) with current at the low (high) end of the range. Magnetohydrodynamic simulation shows that the change in scaling is due to geometric deformation, and that linear scaling continues as current increases. However, the combined effects of shockless acceleration and resistive heating lead to an upper bound on the magnetic field feasible for pulsed power driven flyer plate experiments, which limits the maximum possible speed of a useful flyer plate to < 100 km/s. © Published under licence by IOP Publishing Ltd.

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TYPE Conference YEAR 2014
ScopusOSTIDOI

ALEGRA Update: Modernization and Resilience Progress

Robinson, Allen C.; Petney, Sharon P.; Drake, Richard R.; Weirs, Vincent G.; Adams, Brian M.; Vigil, Dena V.; Carpenter, John H.; Garasi, Christopher J.; Wong, Michael K.; Robbins, Joshua R.; Siefert, Christopher S.; Strack, Otto E.; Wills, Ann E.; Trucano, Timothy G.; Bochev, Pavel B.; Summers, Randall M.; Stewart, James R.; Ober, Curtis C.; Rider, William J.; Haill, Thomas A.; Lemke, Raymond W.; Cochrane, Kyle C.; Desjarlais, Michael P.; Love, Edward L.; Voth, Thomas E.; Mosso, Stewart J.; Niederhaus, John H.

Abstract not provided.

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TYPE Conference YEAR 2013
OSTI
Results 101–125 of 136
Results 101–125 of 136