Two-Dimensional Numerical Evaluation of 1-D Multi-FM SSD Experiments on OMEGA EP

ORAL

Abstract

Adequate single-beam smoothing is crucial for successful direct-drive target implosions. One-dimensional, multi-FM smoothing by spectral dispersion (SSD) has been proposed to provide the required level of smoothing.\footnote{J. A. Marozas, J. D. Zuegel, and T. J. B. Collins, Bull. Am. Phys. Soc. \textbf{55}, 294 (2010).} A prototype multi-FM SSD system has been integrated into one beamline of the OMEGA EP Laser System and has been used in laser-driven planar-foil experiments to study the effectiveness of multi-FM SSD in reducing laser imprint. Recent experiments have achieved significantly improved signal-to-noise by employing a newly-qualified soft x-ray imaging diagnostic. Results of 2-D \textit{DRACO} simulations will be compared with the available experimental data. The simulations include realistic time-dependent far-field spot intensity calculations that emulate the effect of the SSD and have a sufficiently fine computational mesh to resolve speckles. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0001944.

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Authors

  • A. Shvydky

    • Laboratory for Laser Energetics, U. of Rochester

  • M. Hohenberger

    • Laboratory for Laser Energetics, U. of Rochester

  • J.A. Marozas

    • Laboratory for Laser Energetics, U. of Rochester

  • M.J. Bonino

    • Laboratory for Laser Energetics, U. of Rochester

  • D. Canning

    • Laboratory for Laser Energetics, U. of Rochester

  • T.J.B. Collins

    • Laboratory for Laser Energetics, U. of Rochester

  • T.J. Kessler

    • Laboratory for Laser Energetics, U. of Rochester

  • B.E. Kruschwitz

    • Laboratory for Laser Energetics, U. of Rochester

  • P.W. McKenty

    • Laboratory for Laser Energetics, U. of Rochester

  • D.D. Meyerhofer

    • Laboratory for Laser Energetics, U. of Rochester

  • T.C. Sangster

    • Laboratory for Laser Energetics, U. of Rochester

  • J.D. Zuegel

    • Laboratory for Laser Energetics, U. of Rochester