Parametric Instabilities in Turbulent, Inhomogeneous Plasma

Parametric Instabilities in Turbulent, Inhomogeneous Plasma

It is known that parametric instabilities involving two coupled modes, with oppositely directed group velocities, saturate convectively if the medium is inhomogeneous. This work considers the modification of that result when weak long-wave turbulence is present, in addition to the background inhomog...

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Veröffentlicht in:Phys. Rev. Lett., v. 33, no. 20, pp. 1207-1210 v. 33, no. 20, pp. 1207-1210, 1974-11, Vol.33 (20), p.1207-1210
Hauptverfasser: Nicholson, Dwight R., Kaufman, Allan N.
Format: Artikel
Sprache:eng
Schlagworte:
INHOMOGENEOUS PLASMA
INSTABILITY GROWTH RATES
N70700 -Physics-Controlled Thermonuclear Research- Stability
PLASMA EXPANSION
PLASMA MACROINSTABILITIES- PARAMETRIC INSTABILITIES
TURBULENCE
VARIATIONS
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Zusammenfassung:It is known that parametric instabilities involving two coupled modes, with oppositely directed group velocities, saturate convectively if the medium is inhomogeneous. This work considers the modification of that result when weak long-wave turbulence is present, in addition to the background inhomogeneity. We find that the convective saturation disappears when the turbulence exceeds a certain level, absolute growth occurring instead.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.33.1207