Non local-thermodynamical-equilibrium effects in the simulation of laser-produced plasmas
- ARTEP, Inc. Columbia, Maryland20145 (United States)
- Plasma Physics Division, Naval Research Laboratory, Washington, DC20375 (United States)
Local thermodynamic equilibrium (LTE) breaks down in directly or indirectly driven laser plasmas because of sharp gradients, energy deposition, etc. For modeling non-LTE effects in hydrodynamical simulations, Busquet{close_quote}s model [Phys. Fluids B {bold 5}, 4191 (1993)] is very convenient and efficient. It uses off-line generated LTE opacities and equation of states via an effective, radiation-dependent ionization temperature T{sub z}. An overview of the model is given. The results are compared with an elaborate collisional radiative model based on superconfigurations. The agreements for average charge Z{sup {asterisk}} and opacities are surprisingly good, even more so when the plasma is immersed in a radiation field. Some remaining discrepancy at low density is attributed to dielectronic recombination. Improvement appears possible, especially for emissivities, because the concept of ionization temperature seems to be validated. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 627787
- Report Number(s):
- CONF-971103--
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 5; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Local thermodynamic equilibrium in rapidly heated high energy density plasmas
A study of equations of state/opacity of ionized gases. Final report, 31 Oct 1973--31 Oct 1974