XXXVIII international conference on plasma physics and CF, February 14 – 18, 2011, Zvenigorod.
ION ACOUSTIC WAVE DAMPING IN COLLISION PLASMA
V.Yu. Bychenkov, A.V. Brantov, W. Rozmus*
P.N. Lebedev Physical Institute of the Russian Academy of Science, Moscow, Russia,
brantov@sci.lebedev.ru
*
Theoretical Physics Institute,University of Alberta, Edmonton, Canada
The knowledge of exact value of the ion-acoustic wave (IAW) damping rate is of principal
interest for quantitative estimation of the SBS activity of a plasma in laser fusion.
The dielectric plasma permittivity, which is valid for arbitrary ratio between both electron and
ion mean free paths and ion-acoustic wavelength has been derived by using nonlocal transport
theory for two-component electron-ion plasmas [1]. The dispersion relation for low frequency
response of quasi-neutral plasma from exact solutions for perturbations of electron and ion
distribution functions has been solved and damping rate of ion acoustic wave has been found and
studied. The relative contribution of electrons and ions to the IAW damping rate has been analyzed.
The fitting expressions for IAW damping have been proposed which cover an entire range of
wavelengths from the strongly collisional limit (viscous damping) to collisionless case (electron
and ion Landau damping rates).
This work was supported by the Russian Foundation for Basic Research and State support for
leading scientific school of Russian Federation (grant No. NS - 3370.2010.2)
References
[1]. Zheng Z., Rozmus W., Bychenkov V. Yu., Brantov A. V., Capjack C. E., Phys. Plasma,
2009, 16, 102301.
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