Investigation and modeling of radiation-absorption processes and opacities in dense plasmas. Final report, 1 April 1988-28 February 1990

Technical Report · Sat Sep 01 00:00:00 EDT 1990

OSTI ID:5977384

Gupta, U

A variety of atomic processes contribute to absorption of radiation in dense plasmas. Most existing atomic data are for low density, high temperature plasmas. At high densities and low temperatures, realistic modeling to incorporate the important additional effects in order to generate atomic data in needed. This is addressed in the present work. The models and computer codes developed for the project includes effects of non-linear screening, electron degeneracy, exchange-correlation and ion interactions self-consistently. These were applied to ions of specific configurations in dense plasmas and represent improvements over average atom models often used in dense plasma physics. The focus of this work is mainly on the bound-bound, bound-free and free-free photoprocesses, the contribute to radiation absorption and opacity of dense, low temperature plasmas. We discuss a model to generate ionic distribution that is computationally faster than rate equation method. We also discuss a model to investigate the d.c. electron conduction in dense plasmas, which incorporates effects of multiple scattering and improves over the Ziman type model. These self-consistent models and computer codes are very useful tools to generate large data bases for atomic processes contributing to radiation absorption and opacities in dense plasmas. Those data would be a useful input to simulation of radiative properties of dense plasmas in various laboratory and astrophysical conditions.

• Research Organization: SFA, Inc., Landover, MD (USA)
• OSTI ID: 5977384
• Report Number(s): AD-A-228749/8/XAB; SFA-0184Z; CNN: F49620-88-C-0055
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTROMAGNETIC RADIATION
ABSORPTION
PLASMA
OPACITY
ASTROPHYSICS
COMPUTER CODES
CONFIGURATION
DENSITY
ELECTRIC CONDUCTIVITY
EQUATIONS
EXPERIMENTAL DATA
HIGH TEMPERATURE
IONS
LOW TEMPERATURE
MATHEMATICAL MODELS
NONLINEAR PROBLEMS
PROGRESS REPORT
SCATTERING
SIMULATION
CHARGED PARTICLES
DATA
DOCUMENT TYPES
ELECTRICAL PROPERTIES
INFORMATION
NUMERICAL DATA
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
640100* - Astrophysics & Cosmology
640410 - Fluid Physics- General Fluid Dynamics