Effect of ion-acoustic turbulence on the parametric instability near the lower hybrid resonance

Journal Article · Fri Sep 01 04:00:00 EDT 1978 · Sov. J. Plasma Phys. (Engl. Transl.); (United States)

OSTI ID:6279778

Asadullin, F F; Batanov, G M; Sapozhnikov, A V; Sarksyan, K A

The parametric instability which occurs near the lower hybrid resonance in connection with the onset of ion-acoustic turbulence in an originally current-free plasma has been studied experimentally. The experimental conditions corresponded to the relations ..cap omega../sub i/very-much-less-than..omega../sub L/H<..omega../sub 0/very-much-less-than..omega../sub L/e< or approx. =..cap omega..e. The results show a parametric excitation of ion-acoustic noise and of corresponding high-frequency oscillations near the pump frequency over a broad frequency range with a spectrum analogous to that of the ion-acoustic turbulence. The threshold fields for the excitation of the instability increase with increasing level of the acoustic noise in the original plasma, and the steady-state level of acoustic waves in the rf field of the pump wave decreases. The experimental observations show that the acoustic turbulence and the charged-particle velocity distribution affect the parametric wave growth.

• Research Organization: P. N. Lebedev Physics Institute, Academy of Sciences of the USSR, Moscow
• OSTI ID: 6279778
• Journal Information: Sov. J. Plasma Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Plasma Phys. (Engl. Transl.); (United States) Vol. 4:5; ISSN SJPPD
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
BEAMS
ELECTRON BEAMS
FLUCTUATIONS
HYBRID RESONANCE
INSTABILITY
ION ACOUSTIC WAVES
ION WAVES
LEPTON BEAMS
PARAMETRIC INSTABILITIES
PARTICLE BEAMS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMA WAVES
RESONANCE
TURBULENCE
VARIATIONS