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.

Report Date:

1994-12-01

Pagination or Media Count:

260.0

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 12 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