Radiative properties for warm and hot dense matter

Abstract

a b s t r a c tWe will present calculations of opacities for matter under LTE conditions. Opacities are needed in radiation transport codes to study processes like Inertial Confinement Fusion and plasma amplifiers in Xray secondary sources. For the calculations we use the code BiGBART, with either a hydrogenic approximation with j-splitting or self-consistent data generated with the atomic physics code FAC.We calculate the atomic structure, oscillator strengths, radiative transition energies, including UTA computations, and photoionization cross-sections. A DCA model determines the configurations considered in the computation of the opacities. The opacities obtained with these two models are compared with experimental measurements.

Structure of a laser-driven radiative shock

“…The simulations, setup presented elsewhere ( [32]), are performed using Sn (n ¼ 4) radiation transport scheme and with 7 groups of photon energies. The opacities are calculated using BiGBART code [38]. The walls are mimicked by aluminium tube with inner diameter of 400 mm.…”

Simulation of radiative shock waves in Xe of last PALS experiments

“…For the opacity calculation we use our own code BiGBART [30] that can be divided in two main parts: calculation of level populations and frequency dependent radiative properties. Atomic data is generated using the Flexible Atomic Code [31].…”

Influence of atomic kinetics on inverse bremsstrahlung heating and nonlocal thermal transport

“…They consist of a large number of processes that directly depend on atomic state densities, e.g., collisional excitation/deexcitation, ionization/recombination, autoionization/electron capture, photo-ionization and radiative recombination. Detailed expressions for these terms are given in appendix A. Time-dependent Boltzmann kinetic model had been used in the past to simulate ultrashort-pulse high intensity laser experiments (see, for example, [7][8][9]). These studies often assume a spatially homogenous (zero-dimensional) plasma to simplify the calculation.…”