# 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):

# 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