Use of Z-pinch radiation sources for high-pressure shock wave studies Page: 1 of 8
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USE OF Z-PINCH RADIATION SOURCES FOR HIGH-
PRESSURE SHOCK WAVE STUDIES
J.R. Asay, C.H. Konrad, C.A. Hall, W.M. Trott K.J.
Fleming, and T.G. Trucan
JAN 2 9 1998
Sandia National Laboratories, S T I
Albuquerque, New Mexico 87185-1181
There is a continuing need to determine the equation of state (EOS) and constitutive properties of
materials to multi-megabar pressures in support of both weapons and non-weapons applications. Shock
wave techniques have been a principal tool for determining the high pressure EOS of materials in
regimes inaccessible by other methods (1). A variety of shock wave techniques have been developed for
producing well-controlled shock planar shock waves to study dynamic material response. For ultra-high
pressure EOS measurements, underground nuclear tests (2) have also been used to produce shock wave
pressures up to about 3000 Mbar.
High-velocity launchers remain the standard tool for making these measurements. However,
conventional gun technology is limited to launch velocities of about 8 km/s. Projectile impact at these
velocities will produce shock pressures in materials ranging from about 1 Mbar in low-Z materials to
approximately 7 Mbar in high-Z materials. Existing scientific and programmatic problems, however,
require EOS studies at shock pressures of up to tens of megabars. This results in a need to increase the
capability of gun launchers to significantly higher velocities and to develop other sources of shock wave
drive for high-pressure EOS studies.
A variety of radiation sources are being explored for accessing the extremely high-pressure states of
matter. The leading approaches include high intensity lasers and pulsed power methods. Recent results
obtained with laser driven shock waves have produced promising results for high-pressure EOS studies in
plastics and deuterium. For example, Evans et al. (3) have developed direct-deposition laser techniques
using impedance matching to produce shock waves in copper to pressures of about 20 Mbar. More
recently, Cauble et al. developed laser back-lighting technique for making absolute shock wave
measurements of low atomic number materials at extremely high pressure (4). Experimental loading
conditions, however, pose limitations on the sample sizes possible with laser sources. This size
restriction also limits the experimental possibilities for studying a broader range of material properties
other than EOS. For example, measurement of compressive strength in shocked states is of intense
interest in developing constitutive models needed in 3-D computer simulations of dynamic material
response. Typically, such measurements require samples of several centimeters in diameter and several
millimeters in thickness.
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Asay, J. R.; Konrad, C. H.; Hall, C. A.; Trott, W. M.; Chandler, G. A.; Fleming, K. J. et al. Use of Z-pinch radiation sources for high-pressure shock wave studies, article, August 1998; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc702282/m1/1/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.