Modeling with backscatter and transmitted light of high-power smoothed beams with pF3D: a massively parallel laser plasma interaction code

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

doi:10.1117/12.425594

23 April 2001 Modeling with backscatter and transmitted light of high-power smoothed beams with pF3D: a massively parallel laser plasma interaction code

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

Author Affiliations +

Proceedings Volume 4424, ECLIM 2000: 26th European Conference on Laser Interaction with Matter; (2001) https://doi.org/10.1117/12.425594
Event: 26th European Conference on Laser Interaction with Matter (ECLIM 2000), 2000, Prague, Czech Republic

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.

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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, and Peter E. Young "Modeling with backscatter and transmitted light of high-power smoothed beams with pF3D: a massively parallel laser plasma interaction code", Proc. SPIE 4424, ECLIM 2000: 26th European Conference on Laser Interaction with Matter, (23 April 2001); https://doi.org/10.1117/12.425594

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