Showing papers in "High Energy Density Physics in 2007"

TL;DR: SPECT3D as discussed by the authors is a multi-dimensional collisional-radiative code used to post-process the output from radiation-hydrodynamics (RH) and particle-in-cell (PIC) codes to generate diagnostic signatures (e.g. images, spectra) that can be compared directly with experimental measurements.

TL;DR: In this article, a hybrid approach is proposed to treat atomic structure and rates in collisional-radiative models, combining the completeness of highly averaged models with the accuracy of detailed models.

TL;DR: The 4th Non-LTE Code Comparison Workshop as discussed by the authors was held in December 2005 to test the NLTE population kinetics codes, both steady-state and time-dependent cases for C, Ar, Fe, Sn, Xe, and Au plasmas.

TL;DR: The Purgatorio code as discussed by the authors uses phase shift tracking and an efficient refinement scheme to provide an accurate description of the atomic shell-related features which are absent in Thomas-Fermi-based approaches.

TL;DR: In this paper, the static response function in strongly coupled and non-equilibrium plasmas is derived based on a linear response formalism coupled to a charged hard sphere reference for the ions.

TL;DR: In this paper, the authors investigate the assumptions necessary for the application of the non-LTE models and show that an extensive set of configurations is required to provide a valid Kα diagnosis of hot dense matter.

TL;DR: In this article, a collective Thomson scattering experiment at the VUV free electron laser facility at DESY (FLASH) was used to diagnose warm dense matter at near-solid density.

TL;DR: In this article, the dual crystal spectrometer (DCS) was used to record K-shell X-ray spectra from Ag, Sn, Sm, Ta, and Au planar foil targets irradiated by single intense femtosecond pulses from the Titan laser at Lawrence Livermore National Laboratory.

TL;DR: In this article, the authors present a careful analysis of the methodology and approximations used to derive semi-classical Coulomb potentials for Coulomb systems, focusing on the appearance of many-body effects and techniques that may be used to model them.

TL;DR: In this article, experimental results on the interaction of short-pulse ultra-high-intensity laser beams with small size (mass-limited) targets were presented, showing that fast electrons are effectively confined inside the target by the induced space charge, which opens new opportunities to create "warm dense matter" states characterized by solid-state density and temperatures of the order of a few tens of eV.

TL;DR: In this paper, the authors used a cluster expansion of the free energy expression from which they retained the sum of the zero and the first order terms of the first-order terms.

TL;DR: The conversion efficiency of ultra short-pulse laser radiation to K-α X-rays has been measured for various chlorine-containing targets to be used as X-ray scattering probes of dense plasmas as mentioned in this paper.

TL;DR: In this paper, a planar wire array plasmas created by a 1-MA current discharge provided a novel method to investigate dense plasma dynamics, heating mechanism and radiation properties.

TL;DR: In this paper, an intrinsic fast X-ray switch driven by the radiation emission from hollow ion states K 0 L n was proposed for the investigation of the transient evolution of Xray emission from high density plasmas created by short pulses.

TL;DR: In this article, it was shown that the collective effects play a significant role in the statistical and dynamical properties of the microfields of the DebyeeYukawa potential.

TL;DR: In this article, a target with a buried layer of aluminium was used to estimate the conditions in the target by comparing the measured spectra against synthetic spectra generated by the FLY code.

TL;DR: The radiation from implosions of X-pinches and planar wire arrays, which consist of alloyed Al and Mo wires, on the UNR 1MA ZEBRA generator was studied in this article.

TL;DR: Experimental and numerical studies of radiative shocks, of interest as scaled astrophysical objects, have been performed as discussed by the authors, where experiments were conducted at the PALS facility in Prague with a xenon filled mini-shock tube using a laser accelerated plastic pusher.

TL;DR: In this paper, a modified scheme using density functional theory with a Thomas-Fermi kinetic energy functional for the electrons may be well suited to perform molecular dynamics simulations on high Z elements at high densities and temperature, without any assumption on the electronic screening.

TL;DR: In this article, the authors proposed a computational inexpensive but effective approach for the detailed spectral analysis and hydrodynamic simulations based on preliminary detailed calculations for simple homogeneous plasma layers with a specified radiation field.

TL;DR: The Kα X-ray emission spectra of the low-density SiO2 aerogel target bombarded by 48Ca ions with initial energy of 11.4 MeV/u were measured with a high spectral and spatial resolution along 80% of the ion beam stopping path as mentioned in this paper.

TL;DR: In this article, the proton energy distribution generated from the interaction of an intense (Iλ 2 −≈ 10 20 ǫW/cm 2 Âμm 2 ) short-pulse (100-fs) laser with a thin foil was investigated using energy resolved measurements and 2D collisional PIC-hybrid simulations.

TL;DR: In this paper, a systematic study has been carried out on the changes in the L-shell absorption structure of niobium as a result of changing the population of the n = 3 shell from full to having vacancies in the 3D level.

TL;DR: An atomic model of tin plasmas as a part of the numerical simulation of laser produced plasma (LPP) extreme ultra-violet (EUV) source is presented in this paper.

TL;DR: In this article, a simple analytical estimate for the maximum compression is proposed, depending on initial density, atomic weight and atomic number, for the Rankine-Hugoniot shock adiabat.

TL;DR: In this paper, point-projection K-shell absorption spectroscopy has been used to measure absorption spectra of transient aluminum plasma created by an ultra-short laser pulse.

TL;DR: In this paper, a model for self-consistent computations of ionic level populations and the radiation field in transient non-equilibrium plasmas is described using the effective statistical weights (ESW) formalism based on the statistics of the microscopic environment of individual ions.

TL;DR: In this paper, a frequency-doubled laser beam of the Nd:glass kilojoule nanosecond LULI2000 facility was focused on a Xe or Kr gas jet.

TL;DR: The EOSTA model as discussed by the authors combines the STA and INFERNO models to calculate opacities and EOS on the same footing, and the results display regular behavior with respect to density and temperature variation and are in agreement with experiments.

TL;DR: In this article, a simple procedure is described to process line strengths and widths in finely spaced photon energy histogram bins, resulting in a significant speed up of a factor of 100 or more in some cases.