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  • 1
    Digitale Medien
    Digitale Medien
    Nonlinear collisional absorption in laser-driven plasmas (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 4043-4049 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The collisional heating rate of a fully ionized plasma driven by a strong electromagnetic pump wave is re-examined both analytically and with two-dimensional particle-in-cell (PIC) simulations. The high frequency conductivity model of Dawson and Oberman [J. Dawson and C. Oberman, Phys. Fluids 5, 517(1962)] is extended for the case in which the quiver velocity vo=eE/mωo is much larger than the thermal velocity vth and its equivalence to the results of Silin [V. P. Silin, Sov. Phys. JETP 20, 1510 (1965)] is shown. The Dawson and Oberman model is reduced to two-dimensions for comparison with the PIC simulations. Excellent agreement between the theory and the simulations for vo/vth≤1 is obtained. However, when vo/vth(very-much-greater-than)1 and the excursion amplitude xo=eE/mω2o is larger than the Debye length λD, the simulations show enhancements in the collision frequency from the theory. A possible mechanism for this enhancement is provided. © 1994 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.870874
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  • 2
    Digitale Medien
    Digitale Medien
    The evolution of ultra-intense, short-pulse lasers in underdense plasmas (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2047-2056 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The propagation of short-pulse lasers through underdense plasmas at ultra-high intensities (I≥1019 W/cm) is examined. The pulse evolution is found to be significantly different than it is for moderate intensities. The pulse breakup is dominated by leading edge erosion and plasma wave wake formation rather than from Raman forward scattering type instabilities. A differential equation which describes local pump depletion is derived and used to analyze the formation and evolution of the erosion. Pulse erosion is demonstrated with one dimensional particle in cell (PIC) simulations. In addition, two dimensional simulations are presented which show pulse erosion along with other effects such as channeling and diffraction. Possible applications for plasma based accelerators and light sources are discussed. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.872001
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  • 3
    Digitale Medien
    Digitale Medien
    Spatial temporal theory of Raman forward scattering (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 1360-1372 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Raman forward scattering is examined in regimes relevant to short-pulse (〈1ps) high-intensity (I≤1018 W/cm2) laser-plasma interactions. A set of coupled differential equations is derived which describes the spatial-temporal growth of forward and near forward Raman scattering for plane wave pumps. An exact solution for direct forward scattering is obtained for physically relevant initial/boundary conditions. Furthermore, the asymptotic behavior at near forward angles is compared to finite width analyses in which the paraxial ray approximation is made. Noise sources for Raman forward scattering are examined. The consequences of these results to present and near term experiments are discussed. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.871728
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