On the inhomogeneous two‐plasmon instability
作者:
A. Simon,
R. W. Short,
E. A. Williams,
T. Dewandre,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1983)
卷期:
Volume 26,
issue 10
页码: 3107-3118
ISSN:0031-9171
年代: 1983
DOI:10.1063/1.864037
出版商: AIP
数据来源: AIP
摘要:
The two‐plasmon instability in warm inhomogeneous plasma for a normally incident pump is considered. The complex eigenfrequencies of the absolute instability are obtained by reducing the linearized fluid equations to a Schro¨dinger equation in wavenumber space. These eigenvalues are obtained in several ways. One is by combining a perturbation expansion in powers of the reciprocal scale length with WKB theory. The resulting algebraic equations are solved by three analytical approximations and by direct numerical solution. A second way is by analysis of the Schro¨dinger equation using an interactive WKB computer code. A third way is by the use of a shooting code. These methods are all used and compared for threshold curves and growth rates above threshold. Some eigenfunction forms are also obtained. The threshold is near (v0/ve)2k0 L=3, and varies weakly with &bgr;&bartil;v4e/v20c2, rising from near 2 to about 4 over six decades of variation of &bgr;. The corresponding critical value of (ky/k0)2is near 0.2/&bgr; over this range. Above threshold, there is a smooth variation of the growth rate with (ky/k0)2, peaking at some intermediate value. The perturbation method is in good agreement there with more exact calculations. Experimental implications of these results are discussed.
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