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Title: Thin Foil Acceleration Method for Measuring the Unloading Isentropes of Shock-Compressed Matter

Abstract

This work has been performed as part of the search for possible ways to utilize the capabilities of laser and particle beams techniques in shock wave and equation of state physics. The peculiarity of these techniques is that we have to deal with micron-thick targets and not well reproducible incident shock wave parameters, so all measurements should be of a high resolution and be done in one shot. Besides the Hugoniots, the experimental basis for creating the equations of state includes isentropes corresponding to unloading of shock-compressed matter. Experimental isentrope data are most important in the region of vaporization. With guns or explosive facilities, the unloading isentrope is recovered from a series of experiments where the shock wave parameters in plates of standard low-impedance materials placed behind the sample are measured [1,2]. The specific internal energy and specific volume are calculated from the measured p(u) release curve which corresponds to the Riemann integral. This way is not quite suitable for experiments with beam techniques where the incident shock waves are not well reproducible. The thick foil method [3] provides a few experimental points on the isentrope in one shot. When a higher shock impedance foil is placed on the surfacemore » of the material studied, the release phase occurs by steps, whose durations correspond to that for the shock wave to go back and forth in the foil. The velocity during the different steps, connected with the knowledge of the Hugoniot of the foil, allows us to determine a few points on the isentropic unloading curve. However, the method becomes insensitive when the low pressure range of vaporization is reached in the course of the unloading. The isentrope in this region can be measured by recording the smooth acceleration of a thin witness plate foil. With the mass of the foil known, measurements of the foil acceleration will give us the vapor pressure.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
9670
Report Number(s):
SAND99-1943C
TRN: US0103177
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: APS SCCM 99, Topical Conference on Shock Compression of Condensed Matter, Snowbird, UT (US), 06/27/1999--07/02/1999; Other Information: PBD: 21 Jul 1999
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACCELERATION; COMPRESSION; DENSITY; EQUATIONS OF STATE; EVAPORATION; PARTICLE BEAMS; SHOCK WAVES; UNLOADING; VAPOR PRESSURE; LASER RADIATION; ISENTROPIC PROCESSES

Citation Formats

Asay, J R, Chhabildas, L C, Fortov, V E, Kanel, G I, Khishchenko, K V, Lomonosov, I V, Mehlhorn, T, Razorenov, S V, and Utkin, A V. Thin Foil Acceleration Method for Measuring the Unloading Isentropes of Shock-Compressed Matter. United States: N. p., 1999. Web.
Asay, J R, Chhabildas, L C, Fortov, V E, Kanel, G I, Khishchenko, K V, Lomonosov, I V, Mehlhorn, T, Razorenov, S V, & Utkin, A V. Thin Foil Acceleration Method for Measuring the Unloading Isentropes of Shock-Compressed Matter. United States.
Asay, J R, Chhabildas, L C, Fortov, V E, Kanel, G I, Khishchenko, K V, Lomonosov, I V, Mehlhorn, T, Razorenov, S V, and Utkin, A V. Wed . "Thin Foil Acceleration Method for Measuring the Unloading Isentropes of Shock-Compressed Matter". United States. https://www.osti.gov/servlets/purl/9670.
@article{osti_9670,
title = {Thin Foil Acceleration Method for Measuring the Unloading Isentropes of Shock-Compressed Matter},
author = {Asay, J R and Chhabildas, L C and Fortov, V E and Kanel, G I and Khishchenko, K V and Lomonosov, I V and Mehlhorn, T and Razorenov, S V and Utkin, A V},
abstractNote = {This work has been performed as part of the search for possible ways to utilize the capabilities of laser and particle beams techniques in shock wave and equation of state physics. The peculiarity of these techniques is that we have to deal with micron-thick targets and not well reproducible incident shock wave parameters, so all measurements should be of a high resolution and be done in one shot. Besides the Hugoniots, the experimental basis for creating the equations of state includes isentropes corresponding to unloading of shock-compressed matter. Experimental isentrope data are most important in the region of vaporization. With guns or explosive facilities, the unloading isentrope is recovered from a series of experiments where the shock wave parameters in plates of standard low-impedance materials placed behind the sample are measured [1,2]. The specific internal energy and specific volume are calculated from the measured p(u) release curve which corresponds to the Riemann integral. This way is not quite suitable for experiments with beam techniques where the incident shock waves are not well reproducible. The thick foil method [3] provides a few experimental points on the isentrope in one shot. When a higher shock impedance foil is placed on the surface of the material studied, the release phase occurs by steps, whose durations correspond to that for the shock wave to go back and forth in the foil. The velocity during the different steps, connected with the knowledge of the Hugoniot of the foil, allows us to determine a few points on the isentropic unloading curve. However, the method becomes insensitive when the low pressure range of vaporization is reached in the course of the unloading. The isentrope in this region can be measured by recording the smooth acceleration of a thin witness plate foil. With the mass of the foil known, measurements of the foil acceleration will give us the vapor pressure.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {7}
}

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