Isentropic compression experiments on the Sandia Z accelerator

Journal Article · Mon May 01 04:00:00 EDT 2000 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.874029· OSTI ID:20216071

Hall, Clint A ^[1]

---

1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

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.

• OSTI ID: 20216071
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 7; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COLLECTIVE ACCELERATORS
COMPRESSIBILITY
EQUATIONS OF STATE
EXPERIMENTAL DATA
FEASIBILITY STUDIES
PLASMA DIAGNOSTICS
SHOCK WAVES
THEORETICAL DATA