Equation of State Measurements in Liquid Deuterium to 70 GPa

Knudson, Marcus D.; Hanson, D. L.; Bailey, James E.; Hall, C.A.; Anderson, William W.

doi:10.1103/physrevlett.87.225501

Cited by 288 publications

(180 citation statements)

References 19 publications

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“…For instance, x-ray scattering allows not only for the measurement of equation of state data (like in traditional shock wave experiments, see, e.g., Refs. [1,2]), but also to obtain structural, dynamic, and collective properties of matter [3,4,5,6,7]. With these new possibilities, one is now able to probe the physics of high energy density matter as it is encountered during inertial confinement fusion or in the interior of planets.…”

Section: Introductionmentioning

confidence: 99%

Coupled mode effects on energy transfer in weakly coupled, two-temperature plasmas

Vorberger

Gericke

2009

Physics of Plasmas

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We investigate the effects of collective modes on the temperature relaxation rates in fully coupled electron-ion systems. Firstly, the well-understood limit of weakly coupled plasmas is considered and the coupled mode formula within the random phase approximation is derived starting from the Lenard-Balescu kinetic equation. We show how the frequency integration can be performed by standard methods without applying additional approximations. Due to the well-defined approximation scheme, the results can serve as a benchmark for more approximate theories and numerical simulations in this limit. The coupled mode electron-ion transfer rates show a considerable reduction compared to the Fermi-Golden Rule approach for certain parameters and very small changes for other systems. We demonstrate how these coupled mode effects are connected to the occurance of ion acoustic modes and under which conditions they occur. Interestingly, coupled mode effects can also occur for plasmas with very high electron temperatures; a regime, where the Landau-Spitzer approach is believed to give accurate results. Finally, we extend the approach to systems with strongly coupled ions by applying static local field corrections. This extension can substantially increase the coupled mode effects.

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Section: Introductionmentioning

confidence: 99%

Coupled mode effects on energy transfer in weakly coupled, two-temperature plasmas

Vorberger

Gericke

2009

Physics of Plasmas

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“…18 Many equation of state experiments use one or more shock waves to alter the state of a material from an initial condition to a desired new state whose properties can be measured. 19 The shock wave itself might become unstable or might be driven into the radiative regime we will discuss in more detail here. The interaction of the shock wave with structure in the experimental medium may produce dynamics of interest, for example, the destruction of material clumps.…”

Section: Strong Shocks and Radiative Shocksmentioning

confidence: 99%

Perspectives on high-energy-density physics

2009

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Much of 21st century plasma physics will involve work to produce, understand, control, and exploit very nontraditional plasmas. High-energy-density (HED) plasmas are often examples, variously involving strong Coulomb interactions and ⪡1 particles per Debye sphere, dominant radiation effects, and strongly relativistic or strongly quantum-mechanical behavior. Indeed, these and other modern plasma systems often fall outside the early standard theoretical definitions of “plasma.” Here the specific ways in which HED plasmas differ from traditional plasmas are discussed. This is first done by comparison of important physical quantities across the parameter regime accessible by existing or contemplated experimental facilities. A specific discussion of some illustrative cases follows, including strongly radiative shocks and the production of relativistic, quasimonoenergetic beams of accelerated electrons.

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“…The two opacity models give essentially identical results. Most of the simulations have been done with QEOS equation of state [23], with parameters set so that the D-T EOS is intermediate within the range seen in recent experiments [24][25][26]. The simulations use a frequencydependent source, with a spectrum extracted from gold hohlraum simulations.…”

Section: Simulation Detailsmentioning

confidence: 99%

Increasing robustness of indirect drive capsule designs against short wavelength hydrodynamic instabilities

et al. 2005

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Simulations indicate dramatically reduced growth of short wavelength hydrodynamic instabilities, resulting from two changes in the designs. First, better optimization results from systematic mapping of the ignition target performance over the parameter space of ablator and fuel thickness combinations, using techniques developed by one of us (Herrmann). After the space is mapped with one-dimensional simulations, exploration of it with two-dimensional simulations quantifies the dependence of instability growth on target dimensions. Low modes and high modes grow differently for different designs, allowing a trade-off of the two regimes of growth. Significant improvement in high-mode stability can be achieved, relative to previous designs, with only insignificant increase in low-mode growth. This procedure produces capsule designs that, in simulations, tolerate several times the surface roughness that could be tolerated by capsules optimized by older more heuristic techniques. Another significant reduction in instability growth, by another factor of several, is achieved with ablators with radially varying dopant. In this type of capsule the mid-Z dopant, which is needed in the ablator to minimize xray preheat at the ablator-ice interface, is optimally positioned within the ablator. A fabrication scenario for graded dopants already exists, using sputter coating to fabricate the ablator shell. We describe the systematics of these advances in capsule design, discuss the basis behind their improved performance, and summarize how this is affecting our plans for NIF ignition.

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Equation of State Measurements in Liquid Deuterium to 70 GPa

Cited by 288 publications

References 19 publications

Coupled mode effects on energy transfer in weakly coupled, two-temperature plasmas

Coupled mode effects on energy transfer in weakly coupled, two-temperature plasmas

Perspectives on high-energy-density physics

Increasing robustness of indirect drive capsule designs against short wavelength hydrodynamic instabilities

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