Decay instabilities for inhomogeneous plasmas: WKB analysis and absolute instability
作者： G. Picard , T. W. Johnston
DOI: 10.1063/1.865055
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摘要: A general approximate criterion is developed (via WKB analysis) for the absolute instability of two parametrically pumped decay waves with one‐dimensional inhomogeneity. The threshold pump power proves to be higher than that required amplitude amplification R by a factor πk’l2/27R, when k’ phase mismatch dΣki/dx at location maximum and l−2 effective curvature necessarily second‐order expansion about point. Previous results are included as special cases.
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