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Mar 2013

Volume 20, Issue 3, Articles (03xxxx)

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Phys. Plasmas 20, 032106 (2013); http://dx.doi.org/10.1063/1.4794320 (10 pages)

M. Raghunathan and R. Ganesh
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back to top Radiation: Emission, Absorption, Transport

Streaked radiography of an irradiated foam sample on the National Ignition Facility

A. B. R. Cooper, M. B. Schneider, S. A. MacLaren, A. S. Moore, P. E. Young, W. W. Hsing, R. Seugling, M. E. Foord, J. D. Sain, M. J. May, R. E. Marrs, B. R. Maddox, K. Lu, K. Dodson, V. Smalyuk, et al.

Phys. Plasmas 20, 033301 (2013); http://dx.doi.org/10.1063/1.4793727 (10 pages)

Online Publication Date: 5 March 2013

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Streaked x-ray radiography images of annular patterns in an evolving tantalum oxide foam under the influence of a driven, subsonic radiation wave were obtained on the National Ignition Facility. This is the first successful radiography measurement of the evolution of well-defined foam features under a driven, subsonic wave in the diffusive regime. A continuous record of the evolution was recorded on an x-ray streak camera, using a slot-apertured point-projection backlighter with an 8 ns nickel source (7.9 keV). Radiography images were obtained for four different annular patterns, which were corrected using a source-dependent flat-field image. The evolution of the foam features was well-modeled using the 3D KULL radiation hydrodynamics code. This experimental and modeling platform can be modified for scaled high-energy-density laboratory astrophysics experiments.
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52.70.La X-ray and γ-ray measurements
52.38.Mf Laser ablation
52.35.Tc Shock waves and discontinuities
82.70.Rr Aerosols and foams
52.50.Dg Plasma sources
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)

Characteristics of the dynamic shielding on the Wannier-ridge electron escapes by electron impact in weakly coupled plasmas

Dae-Han Ki and Young-Dae Jung

Phys. Plasmas 20, 033302 (2013); http://dx.doi.org/10.1063/1.4794347 (5 pages)

Online Publication Date: 5 March 2013

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The influence of the dynamic shielding on the Wannier ridge electron escapes into the continuum states by the electron-impact is investigated in weakly coupled plasmas. The dynamically shielded renormalized electron charge and screened Wannier exponent are obtained by considering the equation of motion in the Wannier configuration mode with the effective interaction potential as functions of the charge of the residual ion, Debye length, projectile energy, and thermal energy. The result shows that the dynamic renormalized effective electron charge decreases with an increase of the thermal energy, especially for large distances. It is found that the dynamic shielding effect enhances the Wannier exponent for the double-electron escape. The variation of the dynamic shielding effect on the screened Wannier exponent is also discussed.
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52.20.Fs Electron collisions
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions
52.25.Fi Transport properties
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