Accession Number : ADA296918

Title :   Simulation Study of Shocked Particle Velocity Distributions in a HANE Disturbed Plasma.

Descriptive Note : Technical rept. 1 Oct 93-1 Oct 94,

Corporate Author : BERKELEY RESEARCH ASSOCIATES INC CA

Personal Author(s) : Gladd, Nevel T. ; Brecht, Stephen H.

PDF Url : ADA296918

Report Date : 01 AUG 1995

Pagination or Media Count : 31

Abstract : A two dimensional, hybrid particle in cell simulation code is used to study the velocity distributions of a plasma disturbed by a collisionless shock wave generated by a high altitude nuclear explosion. Knowledge of the velocity distributions is crucial in understanding plasma instabilities that thermalize the disturbed plasma and produce the ion deposition spectrum. Variation in the deposition spectrum can cause orders of magnitude differences in IR radiation and ionization and strongly affect systems. The simulations indicate that the relevant anisotropic velocity distributions are shell like rather than bimaxwellian. Since almost all theoretical analysis of thermalizing plasma instabilities have been based on bimaxwellian distributions, this research motivates a reexamination of thermalizing instabilities using velocity distributions that are more physically realistic.

Descriptors :   *NUCLEAR EXPLOSIONS, *AIRBURST, *IONIZATION, COMPUTERIZED SIMULATION, STABILITY, PLASMAS(PHYSICS), PROBABILITY DISTRIBUTION FUNCTIONS, DEPOSITION, PARTICLE SPECTRA, ANISOTROPY, HIGH ALTITUDE, HYDRODYNAMIC CODES.

Subject Categories : Nuclear Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE