Nonlinear Raman scattering behavior with Langmuir and sound waves coupling in a homogeneous plasma

Journal Article · Sun Jul 01 04:00:00 EDT 1990 · Physics of Fluids B; (USA)

DOI:https://doi.org/10.1063/1.859487· OSTI ID:6745515

Bonnaud, G; Pesme, D ^[1]; Pellat, R ^[2]

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1. Commissariat a l'Energie Atomique, Centre d'Etudes de Limeil-Valenton 94195 Villeneuve St. Georges Cedex (France)
2. Centre de Physique Theorique, Ecole Polytechnique, 91128 Palaiseau Cedex (France)

By means of wave-coupling simulations, the typical nonlinear evolution of stimulated Raman scattering (SRS) is investigated in a homogeneous sub-quarter-critical plasma for present-day low laser irradiances and kilo-electron-volt electron temperatures. The decrease of the Langmuir energy observed after the SRS growth is found to be basically the result of the electrostatic decay instability (EDI) onset, which generates a high-amplitude ion-acoustic wave. The resulting strong modulation of the plasma density causes a conversion process that transforms the initial one-wave-vector Langmuir wave driven by SRS into a Bloch wave and induces SRS detuning and larger damping. The conditions involved herein have allowed isolation of these processes from the modulational instability; in addition, the Langmuir collapse is found not to occur owing to the high electron temperature.

• OSTI ID: 6745515
• Journal Information: Physics of Fluids B; (USA), Journal Name: Physics of Fluids B; (USA) Vol. 2:7; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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COHERENT SCATTERING
COUPLING
ELECTRON TEMPERATURE
ENERGY RANGE
HOMOGENEOUS PLASMA
ION ACOUSTIC WAVES
ION WAVES
KEV RANGE
LASER-PRODUCED PLASMA
NONLINEAR OPTICS
OPTICS
PLASMA
PLASMA WAVES
RAMAN EFFECT
SCATTERING