Decay instabilities for inhomogeneous plasmas: WKB analysis and absolute instability

Journal Article · Fri Mar 01 04:00:00 EST 1985 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.865055· OSTI ID:6089310

Picard, G; Johnston, T W

A general approximate criterion is developed (via WKB analysis) for the absolute instability of two parametrically pumped decay waves with one-dimensional inhomogeneity. The absolute instability threshold pump power proves to be higher than that required for amplitude amplification R by a factor ..pi..k'l/sup 2//27R, when k' is the phase mismatch d..sigma..k/sub i//dx at the location of maximum instability and l/sup -2/ is the effective curvature of the necessarily second-order expansion about that point. Previous results are included as special cases.

• Research Organization: INRS-Energie, Universite du Quebec, C.P. 1020, Varennes, Quebec, Canada J0L 2P0
• OSTI ID: 6089310
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 28:3; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
ABSOLUTE INSTABILITIES
DECAY INSTABILITY
ENERGY
INHOMOGENEOUS PLASMA
INSTABILITY
ONE-DIMENSIONAL CALCULATIONS
PARAMETRIC INSTABILITIES
PLASMA
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
THRESHOLD ENERGY
WKB APPROXIMATION