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Proceedings Paper

Modeling with backscatter and transmitted light of high-power smoothed beams with pF3D: a massively parallel laser plasma interaction code
Author(s): R. L. Berger; L. M. Divol; S. H. Glenzer; D. E. Hinkel; R. K. Kirkwood; A. B. Langdon; James Dwayne Moody; C. H. Still; Larry J. Suter; E. A. Williams; Peter E. Young
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Paper Abstract

Using the 3D wave propagation code, F3D, Berger et al., Phys. Plasmas 5,4337, and the massively parallel version pF3D, we have computed the transmitted and reflected light for laser and plasma conditions in experiments that simulated ignition hohlraum conditions. The frequency spectrum and the wavenumber spectrum of the transmitted light are calculated and used to identify the relative contributions of stimulated forward Brillouin and self- focusing in hydrocarbon-filled balloons, commonly called gasbags. The effect of beam smoothing, smoothing by spectral dispersion and polarization smoothing, on the stimulated Brillouin backscatter from Scale-1 NOVA hohlraums was simulated with the use of nonlinear saturation models that limit the amplitude of the driven acoustic waves. Other experiments on CO2 gasbags simultaneously measure at a range of intensities the SBS reflectivity and the Thomson scatter from the SBS-driven acoustic waves that provide a more detailed test of the modeling. These calculations also predict that the backscattered light will be very nonuniform in the near field which is important for specifying the backscatter intensities to be tolerated by the National Ignition Facility laser system.

Paper Details

Date Published: 23 April 2001
PDF: 6 pages
Proc. SPIE 4424, ECLIM 2000: 26th European Conference on Laser Interaction with Matter, (23 April 2001); doi: 10.1117/12.425594
Show Author Affiliations
R. L. Berger, Lawrence Livermore National Lab. (United States)
L. M. Divol, Ctr. d'Etudes Atomique (France)
S. H. Glenzer, Lawrence Livermore National Lab. (United States)
D. E. Hinkel, Lawrence Livermore National Lab. (United States)
R. K. Kirkwood, Lawrence Livermore National Lab. (United States)
A. B. Langdon, Lawrence Livermore National Lab. (United States)
James Dwayne Moody, Lawrence Livermore National Lab. (United States)
C. H. Still, Lawrence Livermore National Lab. (United States)
Larry J. Suter, Lawrence Livermore National Lab. (United States)
E. A. Williams, Lawrence Livermore National Lab. (United States)
Peter E. Young, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 4424:
ECLIM 2000: 26th European Conference on Laser Interaction with Matter
Milan Kalal; Karel Rohlena; Milan Sinor, Editor(s)

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