M. E. Foord

Demonstration of ignition-driven radiation transport through a THOR hohlraum

Ryan Lester, B. M. Haines, H. M. Johns, L. Kot et autres

The achievement of fusion ignition at the National Ignition Facility opens new opportunities for foundational studies in opacity, radiation transport, and high-flux astrophysics in regimes previously unattainable. We have succeeded in the critical enabling step of demonstrating ignition in a hohlraum modified …

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Reduced Model of Ionization Lag in Intense Laser-Produced Plasmas

Min Sang Cho, A. L. Milder, W. Rozmus, Hai P. Le et autres

A physics-based empirical formula is derived to predict the ionization lag in underdense plasmas generated by an intense laser. Time-dependent nonlocal thermodynamic equilibrium calculations demonstrate significantly delayed ionization, due to rapid changes in plasma conditions, which critically impacts plasma properties such as …

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Focussing Protons from a Kilojoule Laser for Intense Beam Heating Using Proximal Target Structures

C. McGuffey, J Kim, M. S. Wei, Phil Nilson et autres

Proton beams driven by chirped pulse amplified lasers have multi-picosecond duration and can isochorically and volumetrically heat material samples, potentially providing an approach for creating samples of warm dense matter with conditions not present on Earth. Envisioned on a larger scale, they …

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Numerical investigation of nonequilibrium electron effects on the collisional ionization rate in the collisional-radiative model

Min Sang Cho, H.-K. Chung, M. E. Foord, Stephen B. Libby et autres

The interplay of kinetic electron physics and atomic processes in ultrashort laser-plasma interactions provides a comprehensive understanding of the impact of the electron energy distribution on plasma properties. Notably, nonequilibrium electrons play a vital role in collisional ionization, influencing ionization degrees and …

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Numerical Investigation of Non-equilibrium Electron Effects on the Collisional Ionization Rate in the Collisional-Radiative Model

Min Sang Cho, H.-K. Chung, M. E. Foord, Stephen B. Libby et autres

The interplay of kinetic electron physics and atomic processes in ultrashort laser-plasma interactions provides a comprehensive understanding of electron energy distribution's impact on plasma properties. Notably, non-equilibrium electrons play a vital role in collisional ionization, influencing ionization degrees and spectra. This paper …

Quantifying electron temperature distributions from time-integrated x-ray emission spectra

M. J. MacDonald, D. A. Liedahl, Gregory V. Brown, Daniel Åberg et autres

K-shell x-ray emission spectroscopy is a standard tool used to diagnose the plasma conditions created in high-energy-density physics experiments. In the simplest approach, the emissivity-weighted average temperature of the plasma can be extracted by fitting an emission spectrum to a single temperature …

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Using tabulated NLTE data for Hohlraum simulations

Howard A. Scott, J. A. Harte, M. E. Foord, D. T. Woods

Non-local thermodyamic equilibrium (NLTE) atomic kinetics is necessary in inertial confinement fusion Hohlraum simulations for adequately modeling high-Z walls and dopants but is computationally very expensive. We present here an approach for tabulating NLTE material data in an economical manner. Material properties …

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Demonstration of Geometric Effects and Resonant Scattering in the X-Ray Spectra of High-Energy-Density Plasmas

G. Pérez-Callejo, E. V. Marley, D. A. Liedahl, L. C. Jarrott et autres

In a plasma of sufficient size and density, photons emitted within the system have a probability of being reabsorbed and reemitted multiple times-a phenomenon known in astrophysics as resonant scattering. This effect alters the ratio of optically thick to optically thin lines, …

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Focussing Protons from a Kilojoule Laser for Intense Beam Heating using Proximal Target Structures

C. McGuffey, Joo-Hwan Kim, M. S. Wei, P. M. Nilson et autres

Abstract Proton beams driven by chirped pulse amplified lasers have multi-picosecond duration and can isochorically and volumetrically heat material samples, potentially providing an approach for creating samples of warm dense matter with conditions not present on Earth. Envisioned on a larger scale, …

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Anomalous material-dependent transport of focused, laser-driven proton beams

Joo-Hwan Kim, C. McGuffey, Donald Cort Gautier, Anthony J. Link et autres

Intense lasers can accelerate protons in sufficient numbers and energy that the resulting beam can heat materials to exotic warm (10 s of eV temperature) states. Here we show with experimental data that a laser-driven proton beam focused onto a target heated …

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Measurement and simulation of the temperature evolution of a short pulse laser heated buried layer target

E. V. Marley, Ronnie L. Shepherd, P. Beiersdörfer, Gregory V. Brown et autres

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Heating, Hydrodynamics, and Radiation From a Laser Heated Non-LTE High-Z Target

William J. Gray, M. E. Foord, Marilyn B. Schneider, M. A. Barrios et autres