Accession Number:

ADA094305

Title:

Generation and Collapse of Langmuir Solitons in a Nonuniform Plasma,

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV LOS ANGELES CENTER FOR PLASMA PHYSICS AND FUSION ENGINEERING

Personal Author(s):

Report Date:

1980-11-01

Pagination or Media Count:

29.0

Abstract:

This numerical study considers the effect of a zero order density gradient on the development of Langmuir wave collapse in two dimensions. Two different situations are considered 1 an initial soliton is perturbed in a direction transverse to the density gradient, and 2 the plasma is resonantly driven by an external pump electric field in the presence of transverse density fluctuations. The principal finding is that the density gradient can inhibit the development of Langmuir collapse for both the initial soliton and the externally driven cases. Over the limited parameter space surveyed it is found that collapse occurs for values of the scaled gradient parameter g or about 2.5 where g 9.8Mm to the 32 power lambda sub DL, M is the ion mass, m the electron mass, lambda sub D the Debye length, and L the gradient scale length. For larger values of g collapse is not observed. author

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE