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  • 1
    Electronic Resource
    Electronic Resource
    Accurate formulas for the Landau damping rates of electrostatic waves (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 463-466 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Systematic perturbation methods are used to derive formulas for the Landau damping rates of electron-plasma and ion-acoustic waves. These formulas are more accurate than the standard formulas found in textbooks. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873212
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  • 2
    Electronic Resource
    Electronic Resource
    Angular dependence of stimulated Brillouin scattering in a homogeneous two-dimensional plasma (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 3587-3596 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 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. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873618
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  • 3
    Electronic Resource
    Electronic Resource
    Exact Green's function for a class of parametric instabilities (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 4511-4514 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spatiotemporal evolution of stimulated Brillouin scattering and stimulated Raman scattering is studied analytically without recourse to the envelope approximation on the time scale of the plasma oscillations. In their regimes of validity, the standard approximate Green's functions for weak coupling and strong coupling describe the growth of the scattered light wave accurately. However, in the transition period between the two regimes, which can be a significant fraction of the duration of an experiment, the approximate solutions cannot be applied and the exact Green's function, which is valid for all times, is required. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873139
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  • 4
    Electronic Resource
    Electronic Resource
    Three-dimensional analysis of the power transfer between crossed laser beams (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 1142-1147 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The power transfer between crossed laser beams made possible by an ion-acoustic wave is studied. The power transfer between beams with Gaussian intensity profiles shifts the beam centroids, and alters the beam directions and focal lengths. The power transfer between beams with hot spots in their intensity profiles depends sensitively on whether the associated beam filaments intersect. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872645
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  • 5
    Electronic Resource
    Electronic Resource
    Spatiotemporal evolution of parametric instabilities driven by short laser pulses: Two-dimensional analysis (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3347-3357 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spatiotemporal evolution of parametric instabilities such as stimulated Raman scattering is studied analytically in time and two spatial dimensions. Initial and boundary conditions are chosen to represent the entrance, propagation, and exit of a laser pulse of finite extent convecting through a homogeneous collisional plasma with definite boundaries. For most scattering angles the growth is found to be dominated by two-dimensional effects with one-dimensional amplitudes being valid for only a small range of angles corresponding to near forward and near backward scattering. The sideward convection alters the spatiotemporal character of the instability and inhibits but does not suppress its growth. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872476
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  • 6
    Electronic Resource
    Electronic Resource
    Near-forward stimulated Brillouin scattering (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 4227-4231 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spatiotemporal evolution of near-forward stimulated Brillouin scattering (SBS) is studied in detail. For large scattering angles SBS grows and saturates as a three-wave instability. For small scattering angles SBS begins to grow as a three-wave instability, then continues to grow and saturates as a four-wave instability. Expressions for the saturation time and steady-state gain exponent of SBS are derived for large and small scattering angles. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872584
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  • 7
    Electronic Resource
    Electronic Resource
    Two-dimensional analysis of the power transfer between crossed laser beams (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2686-2692 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The power transfer between crossed laser beams made possible by an ion-acoustic wave is studied. A simple formula is derived for the steady-state power transfer, which depends on two dimensionless parameters: the ratio of the incident beam intensities and the normalized beamwidth. Numerical simulations show that the transient power transfer is larger than the steady-state power transfer and usually oscillates in time. The convective depletion of the higher-frequency beam saturates the power transfer more quickly than the damping of the ion-acoustic wave. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871721
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  • 8
    Electronic Resource
    Electronic Resource
    Spatiotemporal evolution of parametric instabilities driven by short laser pulses: One-dimensional analysis (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 4683-4696 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spatiotemporal evolution of parametric instabilities such as stimulated Raman scattering and stimulated Brillouin scattering is studied analytically, within the framework of a one-dimensional model. New solutions of the model equations are found that illustrate the evolution of forward, sideward, and backward instabilities. The evolution of instabilities that are initiated by fluctuations within the plasma has two distinct phases. The first phase is characterized by exponential functions, whereas the second phase is characterized by Bessel functions. For times that are shorter than the time taken for the leading edge of the laser pulse to cross the plasma, near-forward instabilities dominate. For longer times near-sideward instabilities dominate. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872073
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  • 9
    Electronic Resource
    Electronic Resource
    Response to "Comment on ‘Angular dependence of stimulated Brillouin scattering in homogeneous plasma' " [Phys. Plasmas 5, 1215 (1998)] (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 1218-1219 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In their comment ,〈citeref RID="R1" STYLE="SUPERIOR"〉1 Gupta and Sinha extend the analysis given by the authors〈citeref RID="R2" STYLE="SUPERIOR"〉2 of stimulated Brillouin scattering in a stationary plasma to a flowing plasma. The authors content that their formula including ion-temperature contribution is more accurate than that of Gupta and Sinha. (AIP)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873091
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  • 10
    Electronic Resource
    Electronic Resource
    Angular dependence of stimulated Brillouin scattering in homogeneous plasma (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 4596-4605 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The angular dependence of stimulated Brillouin scattering (SBS) in a finite homogeneous plasma is studied. For parameters typical of inertial confinement fusion experiments, the initial evolution of SBS is well approximated by a one-dimensional model. In the context of this linear model, the threshold intensity of the absolute instability and the steady-state spatial growth rate of the convective instability are both independent of the scattering angle. However, the saturation time of the convective instability exhibits a strong inverse dependence on the scattering angle: Forward SBS always occurs in the transient regime and the intensity of the scattered light is less than that predicted by a steady-state analysis. In particular, no light is emitted in the propagation direction of the incident wave. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871464
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