Parametric Instabilities of Damped Modes in Inhomogeneous Plasmas.
Abstract
Using WKB analysis it is shown that for three-wave backscattering type parametric instabilities in inhomogeneous plasmas no spatial (convective) growth is possible for undamped modes. If one coupled mode is more heavily damped than the other, then spatial growth is possible in both forward and back-scattering. The spatial amplification factor is that obtained by Rosenbluth only if the pump power is sufficiently above a damping-determined threshold but below a threshold for temporal or absolute instability exists for the backscatter instabilities. For the parametric decay instability at (omega sub 0) = 2(omega sub pe) in a finite spatial region only a temporal instability is found but no spatial (convective) growth. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1973
- Accession Number
- AD0763737
Entities
People
- Donald F. Dubois
- Edward A. Williams
Organizations
- University of Colorado Boulder