Shock driven melting and resolidification upon release in cerium

ORAL

Abstract

The temperature rise due to increasing entropy during shock compression and the corresponding temperature decrease due to isentropic expansion upon release cause the physics of melting and solidification under dynamic pressure changes to differ fundamentally from the more common liquid-solid transitions governed by thermal diffusion. We investigated laser shock driven melting and resolidification during release in cerium to examine the dynamics of these processes. Cerium was selected as the material of study due to the low pressure at which $\gamma$-cerium melts along the principle Hugoniot and due to cerium's anomalous melt boundary at low pressure, which facilitates its transition from liquid to solid during isentropic release. The structural phase of cerium was probed with X-ray diffraction using the LCLS X-ray free electron laser, which provided \textit{in situ} measurements of the transition dynamics. The experimental results will be presented showing the resolidification occurring over 10s of ns.

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Authors

  • Cynthia Bolme

    Los Alamos Natl Lab, Los Alamos National Laboratory, LANL

  • Curt Bronkhorst

    Los Alamos National Laboratory, Los Alamos Natl Lab

  • Don Brown

    Los Alamos National Laboratory

  • Frank Cherne

    Los Alamos Natl Lab, M-9 Shock and Detonation Phsyics Group, Los Alamos National Laboratory, Los Alamos National Laboratory, NM

  • Jason Cooley

    Los Alamos National Laboratory

  • Michael Furlanetto

    Los Alamos National Laboratory

  • Arianna Gleason

    Los Alamos National Laboratory

  • Brian Jensen

    Los Alamos National Laboratory, Los Alamos Natl Lab, M-9 Shock and Detonation Phsyics Group, Los Alamos National Lab

  • Charles Owens

    Los Alamos National Laboratory

  • Suzanne Ali

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Dayne Fratanduono

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab, LLNL

  • Eric Galtier

    SLAC - Natl Accelerator Lab, SLAC National Accelerator Laboratory, SLAC

  • Eduardo Granados

    SLAC National Accelerator Laboratory

  • Hae Ja Lee

    SLAC National Accelerator Laboratory, Matter in Extreme Conditions Instrument, SLAC, Stanford Linear Accelerator

  • Bob Nagler

    SLAC National Accelerator Laboratory, SLAC, Stanford Linear Accelerator