Laser induced ramp compression of Zr on nano-second scales

ORAL

Abstract

Quasi-isentropic ramp waves are advantageous in resolving wave structures due to phase-transitions and other dissipative phenomena. An open question is how this behavior changes with strain rate and kinetics of material transformation. To address this question, we study how phase transitions in Zr are affected when ramp waves are induced by short laser pulses extending over 1-10 ns time scales. Measurements are performed in thin 0.2 – 10 um Zr films using several different experimental platforms. Velocimetry data is collected using the line VISAR interferometry and analyzed using the Lagrangian and forward simulation methods. The results obtained are being compared to the corresponding Hugoniot and isentrope curves reported in the literature at longer time scales.

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Presenters

  • Paulius Grivickas

    Lawrence Livermore Natl Lab

Authors

  • Paulius Grivickas

    Lawrence Livermore Natl Lab

  • Michael Armstrong

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory

  • Jonathan Crowhurst

    Lawrence Livermore Natl Lab

  • Harry Radousky

    Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • Joseph Zaug

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • Ryan Austin

    Lawrence Livermore Natl Lab

  • Jon Belof

    Lawrence Livermore National Laboratory, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab