Hydrodynamic Growth of Perturbations Seeded by Isolated Defects

ORAL

Abstract

The hydrodynamic growth of pre-imposed isolated surface defects has been measured on the Nike laser. The defects had characteristic sizes of < 1 to 10's of μm, consistent with

typical spatial scales of inertial confinement fusion isolated target defects. High resolution monochromatic xray imagers captured streaked and two-dimensional images of the perturbation growth. High resolution FASTRAD3D simulations have been compared to experimental results, reproducing trends observed with varied defect size, laser drive. The

walls of the isolated bubble were observed ahead of the target while the spikes grew obliquely in towards the centerline of the defect, behind the accelerated part of the target. The latter observation suggests the use of areal density measurements alone are an insufficient diagnostic for measurements of isolated defect perturbation growth in inertial confinement fusion experiments.

*This research was supported by a Naval Research Laboratory Karles Fellowship and the U.S. Department of Energy’s National Nuclear Security Administration.Targets were machined with the SWOrRD laser, purchased with NRL code 6700 CPP funding.

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Publication: -C. Zulick, Y Aglitskiy, M Karasik, AJ Schmitt, AL Velikovich, SP Obenschain, "Multimode Hydrodynamic Instability Growth of Preimposed Isolated Defects in Ablatively Driven Foils", Physical Review Letters 125 055001 (2020).
-C. Zulick, Y Aglitskiy, M Karasik, AJ Schmitt, AL Velikovich, SP Obenschain, "Isolated defect evolution in laser accelerated targets", Physics of Plasmas 27 072706 (2020).
- AL Velikovich, AJ Schmitt, C Zulick, Y Aglitskiy, M Karasik, and SP Obenschain, JG Wouchuk and F Cobos Campos, "Multi-mode hydrodynamic evolution of perturbations seeded by isolated surface defects" Physics of Plasmas (Submitted).
-Y Aglitskiy, C Zulick, J Oh, AL Velikovich, AJ Schmitt, SP Obenschain, M Karasik, JL Weaver, "Plasma hydrodynamic experiments on NRL Nike KrF laser" High Energy Density Physics 37 100866 (2020).

Presenters

  • Calvin Zulick

    • United States Naval Research Laboratory

Authors

  • Calvin Zulick

    • United States Naval Research Laboratory

  • Yefim Aglitskiy

    • United States Naval Research Laboratory

  • Max Karasik

    • United States Naval Research Laboratory

  • Andrew J Schmitt

    • United States Naval Research Laboratory
    • NRL

  • Alexander L Velikovich

    • NRL
    • United States Naval Research Laboratory
    • Plasma Physics Division, United States Naval Research Laboratory

  • Stephen P Obenschain

    • United States Naval Research Laboratory
    • NRL