Equation of State Measurements at Low Pressure in Tin Using of 800 MeV Proton Radiography

ORAL

Abstract

A 2cm long 8 mm diameter cylindrical tin target has been shocked to a pressure in the region of the $\beta \diamondsuit \gamma $ phase change using a small, low density PETN charge mounted on the opposite side of a stainless steel diaphragm. The density jump and shock velocity were measured radiographically as the shock wave moved though the sample and the pressure dropped, using the proton radiography facility at LANL. This provided a quasi-continuous record of the equations of state along the Hugoniot for the P1 wave from a shock velocity of 3.25 km/sec down to near the sound speed. Edge release effects were removed from the data using tomographic techniques. The data show evidence for a phase transition that extends over a broad pressure range. The data and analysis will be presented.

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Authors

  • Cynthia Schwartz

    • Los Alamos National Laboratory

  • Gary Hogan

    • Los Alamos National Laboratory

  • Nicholas King

    • Los Alamos National Laboratory

  • Kris Kwiatkowski

    • Los Alamos National Laboratory

  • Fesseha Mariam

    • Los Alamos National Laboratory

  • Mark Marr-Lyon

    • Los Alamos National Laboratory

  • Wendy McNeil

    • Los Alamos National Laboratory

  • Frank Merrill

    • LANL
    • Los Alamos National Laboratory

  • Chris Morris

    • Los Alamos National Laboratory

  • Paul Rightley

    • Los Alamos National Laboratory

  • Alexander Saunders

    • Los Alamos National Laboratory