Angular dependence of stimulated Brillouin scattering in a homogeneous two-dimensional plasma

Journal Article · Wed Sep 01 04:00:00 EDT 1999 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.873618· OSTI ID:362683

Giacone, R E; McKinstrie, C J; Kolber, T ^[1]

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1. Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627 (United States)

The linear evolution of stimulated Brillouin scattering (SBS) in time and two spatial dimensions was studied analytically and numerically. In order to assess the effects that the finite size of the laser beam has on SBS, wide and narrow laser-beam geometries were considered. Detailed comparisons were made between the predictions of reduced one- and two-dimensional models, which can be solved analytically, and the results of two-dimensional numerical simulations. It was found that SBS is characterized by three parameters: the spatial growth rate in the direction of the Stokes wave, the spatial damping rate of the ion-acoustic wave in the direction of the Stokes wave, and the normalized width of the interaction region. The SBS can be saturated by the damping or the lateral convection of the ion-acoustic wave, both of which limit the growth of the ion-acoustic wave (directly) and the Stokes wave (indirectly). For most scattering angles the saturation mechanism predicted by the reduced models, and the corresponding saturation time and gain factor, agree with the simulation results. {copyright} {ital 1999 American Institute of Physics.}

• OSTI ID: 362683
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 9 Vol. 6; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANGULAR DISTRIBUTION
BRILLOUIN EFFECT
ION ACOUSTIC WAVES
LIGHT SCATTERING
LIGHT TRANSMISSION
PLASMA SIMULATION
TWO-DIMENSIONAL CALCULATIONS