Accession Number : ADA289602

Title :   Radiation Production From Stagnating Compact Toroids Employing a Nonequilibrium Radiation Diffusion Model.

Descriptive Note : Final rept. Sep 90-May 94,

Corporate Author : PHILLIPS LAB KIRTLAND AFB NM

Personal Author(s) : Douglas, Melissa R.

PDF Url : ADA289602

Report Date : DEC 1994

Pagination or Media Count : 260

Abstract : The stagnation of a high Z, high velocity compact toroidal plasma against a stationary object has been shown computationally to be an efficient radiation source. To obtain a better understanding of the stagnation process and the influence of various prestagnation properties on radiation production, the 2 1/2 dimensional radiation magnetohydrodynamic code, MACH2, was used to simulate the stagnation physics. To perform these calculations, a flux-limited non-equilibrium radiation diffusion model was incorporated into the MACH2 code. In this model the radiation field evolves separately from the material components of the fluid and is described by a Plankian distribution at the radiation temperature, TR. This introduced a dynamic equation for the radiation field and modifications to both the momentum and electron energy equations. A flux-limited version of the radiative conductivity was formulated to extend this model into the optically thin regime. Detailed benchmarking of the radiation diffusion and electron-radiation coupling using a set of radiation MHD test problems was conducted. (AN)

Descriptors :   *PLASMAS(PHYSICS), *STAGNATION, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, MAGNETIC FIELDS, EXPERIMENTAL DATA, TEMPERATURE, FINITE DIFFERENCE THEORY, ELECTRON ENERGY, THERMAL DIFFUSION, APPROXIMATION(MATHEMATICS), KINETIC ENERGY, TOROIDS, HYDRODYNAMIC CODES, NONEQUILIBRIUM FLOW, GAS DISCHARGES, ELECTRON FLUX, MOMENTUM, THERMAL RADIATION, MAGNETOHYDRODYNAMICS, PINCH EFFECT.

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE