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Nichtstationäre Reflexion und Reemission von Wellen bei Herausbildung elektromagnetischer Strukturresonanzen im Plasma
Author(s) -
Andrejew N. E.,
Gradow O. M.,
Sünder D.
Publication year - 1980
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.19800200304
Subject(s) - atomic physics , plasma , physics , resonance (particle physics) , homogeneous , field (mathematics) , chemistry , quantum mechanics , thermodynamics , mathematics , pure mathematics
The nonstationary resonant reflectivity of a density profile is studied which consists of two homogeneous overcritical layers, separated by a vacuum region whose width increases linearly in time. Analytical expressions are derived for the time dependence of both the reflexion coefficient and the cavity field in the case of normal incidence. If the configuration passes through a structure resonance, where the eigenfrequency of the density cavity coincides with the frequency of the external wave, the cavity field is strongly enhanced. The temporary formation and the subsequent decay of this resonant field leads to oscillations of the reflexion coefficient. In the case of a loss‐less plasma it may reach the extreme values | R | max 2= 0 | R | max 2≈ 3 and the moving plasma configuration temporarily acts as an energy storage (| R | 2 < 1) or an emitter (∣ R ∣ 2 > 1).