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Title: Isentropic compression experiments on the Sandia Z accelerator

Abstract

A long-standing goal of the equation of state (EOS) community has been the development of a loading capability for direct measurement of material properties along an isentrope. Previous efforts on smooth bore launchers have been somewhat successful, but quite difficult to accurately reproduce, had pressure limitations, or tended to be a series of small shocks as opposed to a smoothly increasing pressure load. A technique has recently been developed on the Sandia National Laboratories Z accelerator which makes use of the high current densities and magnetic fields available to produce nearly isentropic compression of samples that are approximately 1 mm in thickness over approximately 120 ns. Velocity interferometry is used to measure the rear surface motion of these samples. The resulting time resolved velocity profiles from multiple sample thicknesses provide information about mechanical response under isentropic loading conditions and phase transition kinetics. Feasibility experiments have been performed to pressures of approximately 130 kbar in copper and 300 kbar in iron with effects of the {alpha}-{epsilon} phase change kinetics in iron clearly observed. Work is in progress to achieve 1%-2% accuracy in P-v space along an isentrope, provide uniaxial strain, and to eliminate magnetic field and current diffusion within the samplemore » of interest. (c) 2000 American Institute of Physics.« less

Authors:
 [1]
  1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
Publication Date:
OSTI Identifier:
20216071
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 7; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; PLASMA DIAGNOSTICS; COLLECTIVE ACCELERATORS; EQUATIONS OF STATE; COMPRESSIBILITY; SHOCK WAVES; FEASIBILITY STUDIES; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Hall, Clint A. Isentropic compression experiments on the Sandia Z accelerator. United States: N. p., 2000. Web. doi:10.1063/1.874029.
Hall, Clint A. Isentropic compression experiments on the Sandia Z accelerator. United States. doi:10.1063/1.874029.
Hall, Clint A. Mon . "Isentropic compression experiments on the Sandia Z accelerator". United States. doi:10.1063/1.874029.
@article{osti_20216071,
title = {Isentropic compression experiments on the Sandia Z accelerator},
author = {Hall, Clint A.},
abstractNote = {A long-standing goal of the equation of state (EOS) community has been the development of a loading capability for direct measurement of material properties along an isentrope. Previous efforts on smooth bore launchers have been somewhat successful, but quite difficult to accurately reproduce, had pressure limitations, or tended to be a series of small shocks as opposed to a smoothly increasing pressure load. A technique has recently been developed on the Sandia National Laboratories Z accelerator which makes use of the high current densities and magnetic fields available to produce nearly isentropic compression of samples that are approximately 1 mm in thickness over approximately 120 ns. Velocity interferometry is used to measure the rear surface motion of these samples. The resulting time resolved velocity profiles from multiple sample thicknesses provide information about mechanical response under isentropic loading conditions and phase transition kinetics. Feasibility experiments have been performed to pressures of approximately 130 kbar in copper and 300 kbar in iron with effects of the {alpha}-{epsilon} phase change kinetics in iron clearly observed. Work is in progress to achieve 1%-2% accuracy in P-v space along an isentrope, provide uniaxial strain, and to eliminate magnetic field and current diffusion within the sample of interest. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.874029},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 7,
place = {United States},
year = {2000},
month = {5}
}