Accession Number : AD0696150

Title :   VELOCITY SPACE DIFFUSION AND LANDAU DAMPING IN COLLISIONAL PLASMAS,

Corporate Author : CITY COLL NEW YORK DEPT OF CIVIL ENGINEERING

Personal Author(s) : Li,Kwok-Leung ; Jen,Norman C.

Report Date : 01 SEP 1969

Pagination or Media Count : 63

Abstract : The statistical behavior of a completely ionized plasma in which collisional effects are included is described by the Vlasov equation coupled to the Poisson equation, terms suggested by the Krook relaxation model and the isotropic Fokker-Planck model being chosen as collision operators. As a result of perturbations on the background distribution function, longitudinal oscillations are set up and the plasma diffuses in velocity space as a consequence of wave-particle interaction. The coupled equations are solved by the method of characteristics in the Fourier transformed space, employing the quasi-linear approximation developed by Drummond, Pines, Vendenov, Velikhov and Sagdeev. The longitudinal behavior of the plasma is followed into the quasi-linear regime in which both collisional and collisionless Landau damping and velocity space diffusion mechanisms are investigated. The rate of dissipation is shown to have collisionless as well as collisional attributes. (Author)

Descriptors :   (*OSCILLATION, INTERACTIONS), VELOCITY, DAMPING, DIFFUSION, PERTURBATION THEORY, FOURIER ANALYSIS, PLASMA MEDIUM, (U)PLASMA MEDIUM

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE