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Parametrische Phononen‐Turbulenz im Feld zweier zirkular polarisierter UHF‐Wellen
Author(s) -
Andrejew N. E.,
Sünder D.
Publication year - 1977
Publication title -
beiträge aus der plasmaphysik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0005-8025
DOI - 10.1002/ctpp.19770170502
Subject(s) - phonon , excited state , dissipative system , atomic physics , physics , ion , plasma , electron , ionization , condensed matter physics , quantum mechanics
The interaction of two strong circulary polarized u.h.f. pump waves with a fully ionized homogeneous plasma is considered. If the difference Ω of their frequencies is near or smaller than twice the ion plasma frequency phonons can be parametrically excited. The threshold value ( E 0 E 1 ) s for this decay‐process depends on Ω and the dissipative effects in the plasma. After exceeding the thermal level the phonons are stabilized due to the scattering by the ions. The evolution of the parametrically excited phonon turbulence and the transition into a stationary state are described by a nonlinear integro‐differential equation for the spectral energy density of the phonons. This equation is solved analytically as well as numerically and it is shown, that the phonon turbulence is strongly influence by the propagation directions of the pump waves and the ratio of electron‐ to ion‐temperature.