Probing the Kinetics of the Alpha–Epsilon Phase Transition in Shock-Compressed Iron Using Time-Resolved X-Ray Diffraction

ORAL

Abstract

A method of measuring multiple temporally resolved powder x-ray diffraction (XRD) measurements during a single laser experiment has been demonstrated on shock-compressed iron at the Omega EP Laser Facility. Using a variation of the time-integrating powder XRD image-plate configuration, up to four temporally resolved snapshots of the XRD pattern are collected on an x-ray framing camera with a 2θ scattering angle coverage of 48° to 66° with a 400-ps temporal resolution.[1] XRD snapshots of the alpha–epsilon phase transition in iron capture the shock-transit, shock-breakout, and shock-release evolution, providing insight into the time dependence of the transformation.

[1] J. R. Rygg et al., Rev. Sci. Instrum. 83, 113904 (2012).

*This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0003856 and HED Quantum Matter under Award Number DE-SC0020340.

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Presenters

  • Danae N Polsin

    • Laboratory for Laser Energetics

Authors

  • Danae N Polsin

    • Laboratory for Laser Energetics

  • Laura Robin Benedetti

    • Lawrence Livermore National Laboratory

  • Xuchen Gong

    • Lab for Laser Energetics

  • David A Chin

    • University of Rochester

  • Gilbert W Collins

    • University of Rochester

  • J. Ryan Rygg

    • University of Rochester

  • Federica Coppari

    • Lawrence Livermore Natl Lab

  • Jon H Eggert

    • LLNL

  • David K Bradley

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • James M McNaney

    • Lawrence Livermore Natl Lab

  • Kalpani - Werellapatha

    • University of California San Diego
    • Lawrence Livermore National Laboratory