Oxford Centre for High Energy Density Science (OxCHEDS)

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Studying astrophysical plasmas in the laboratory

Discovery 9 (2004) 10-10

Authors:

FP Keenan, SJ Rose

Thomson scattering measurements of heat flow in a laser-produced plasma

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 37:7 (2004) PII S0953-4075(04)75560-1

Authors:

J Hawreliak, DM Chambers, SH Glenzer, A Gouveia, RJ Kingham, RS Marjoribanks, PA Pinto, O Renner, P Soundhauss, S Topping, E Wolfrum, PE Young, JS Wark
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Time-resolved X-ray diffraction study of the ferroelectric phase-transition in DKDP

CHEMICAL PHYSICS 299:2-3 (2004) 157-161

Authors:

J Larsson, P Sondhauss, O Synnergren, M Harbst, PA Heimann, AM Lindenberg, JS Wark
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X-ray diffraction from shocked crystals: Experiments and predictions of molecular dynamics simulations

AIP CONF PROC 706 (2004) 1195-1198

Authors:

K Rosolankova, DH Kalantar, JF Belak, EM Bringa, MJ Caturla, J Hawreliak, BL Holian, K Kadau, PS Lomdahl, TC Germann, R Ravelo, J Sheppard, JS Wark

Abstract:

When a crystal is subjected to shock compression beyond its Hugoniot Elastic Limit (HEL), the deformation it undergoes is composed of elastic and plastic strain components. In situ time-dependent X-ray diffraction, which allows direct measurement of lattice spacings, can be used to investigate such phenomena. This paper presents recent experimental results of X-ray diffraction from shocked fcc crystals. Comparison is made between experimental data and simulated X-ray diffraction using a post-processor to Molecular Dynamics (MD) simulations of shocked fcc crystals.
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Molecular-dynamic calculation of the relaxation of the electron energy distribution function in a plasma

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 68:5 2 (2003) 564011-564018

Authors:

N David, SM Hooker

Abstract:

A molecular-dynamic (MD) code for calculating the relaxation of an arbitrary electron energy distribution in a plasma was described. The MD approach provided a more fundamental set of equations, with fewer assumptions. The accuracy of the MD approach was proved by comparing its results with the Monte Carlo and Fokker-Planck codes using a set of plasma parameters for which the Fokker-Planck calculation gave incorrect results. Calculating energy relaxation in plasmas proved important for the understanding of the operation of new types of short-wavelength lasers based on optical field ionization.