Oxford Centre for High Energy Density Science (OxCHEDS)

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Bragg diffraction using a 100 ps 17.5 keV x-ray backlighter and the Bragg diffraction imager

REVIEW OF SCIENTIFIC INSTRUMENTS 81:10 (2010) ARTN 10E522

Authors:

BR Maddox, H-S Park, J Hawreliak, A Elsholz, R Van Maren, BA Remington, A Comley, JS Wark
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Laser Physics

Oxford University Press, 2010

Authors:

SM Hooker, CE Webb

Abstract:

In this book the interaction of radiation and matter, and the principles of laser operation are treated at a level suitable for fourth-year undergraduate ...

Metal deformation and phase transitions at extremely high strain rates

MRS BULLETIN 35:12 (2010) 999-1006

Authors:

RE Rudd, TC Germann, BA Remington, JS Wark
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Phonon instabilities in uniaxially compressed fcc metals as seen in molecular dynamics simulations

PHYSICAL REVIEW B 81:9 (2010) ARTN 092102

Authors:

Giles Kimminau, Paul Erhart, Eduardo M Bringa, Bruce Remington, Justin S Wark
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Evolution of elastic x-ray scattering in laser-shocked warm dense lithium

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 80:6 (2009)

Authors:

NL Kugland, G Gregori, S Bandyopadhyay, CM Brenner, CRD Brown, C Constantin, SH Glenzer, FY Khattak, AL Kritcher, C Niemann, A Otten, J Pasley, A Pelka, M Roth, C Spindloe, D Riley

Abstract:

We have studied the dynamics of warm dense Li with near-elastic x-ray scattering. Li foils were heated and compressed using shock waves driven by 4-ns-long laser pulses. Separate 1-ns-long laser pulses were used to generate a bright source of 2.96 keV Cl Ly- α photons for x-ray scattering, and the spectrum of scattered photons was recorded at a scattering angle of 120° using a highly oriented pyrolytic graphite crystal operated in the von Hamos geometry. A variable delay between the heater and backlighter laser beams measured the scattering time evolution. Comparison with radiation-hydrodynamics simulations shows that the plasma is highly coupled during the first several nanoseconds, then relaxes to a moderate coupling state at later times. Near-elastic scattering amplitudes have been successfully simulated using the screened one-component plasma model. Our main finding is that the near-elastic scattering amplitudes are quite sensitive to the mean ionization state Z̄ and by extension to the choice of ionization model in the radiation- hydrodynamics simulations used to predict plasma properties within the shocked Li. © 2009 The American Physical Society.
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