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Asymptotic measurements of free surface instabilities in laser-induced shock waves

Published online by Cambridge University Press:  09 March 2009

M. Werdiger ,
B. Arad ,
Z. Henis ,
Y. Horowitz ,
E. Moshe ,
S. Maman ,
A. Ludmirsky  and
S. Eliezer
M. Werdiger
Affiliation:
Plasma Physics, Soreq NRC, Yavne 81800, Israel
B. Arad
Affiliation:
Plasma Physics, Soreq NRC, Yavne 81800, Israel
Z. Henis
Affiliation:
Plasma Physics, Soreq NRC, Yavne 81800, Israel
Y. Horowitz
Affiliation:
Plasma Physics, Soreq NRC, Yavne 81800, Israel
E. Moshe
Affiliation:
Plasma Physics, Soreq NRC, Yavne 81800, Israel
S. Maman
Affiliation:
Plasma Physics, Soreq NRC, Yavne 81800, Israel
A. Ludmirsky
Affiliation:
Plasma Physics, Soreq NRC, Yavne 81800, Israel
S. Eliezer
Affiliation:
Plasma Physics, Soreq NRC, Yavne 81800, Israel
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Abstract

An experimental technique based on optical scattering to detect melting in release of strongly shocked materials is presented. This method is used to study the asymptotic behavior of the free surface of shock-loaded materials. After reflection of a shock wave from a metallic sample free surface, occurrence of a solid to liquid transition will induce a dynamic behavior such as mass ejection and development of instabilities. A study of the mass ejection due to laser-induced shock waves in aluminium, copper, and tin targets is presented. Shock waves of order of hundreds of kilobars to more than one megabar are produced by a Nd:YAG laser system with a wavelength of 1.06 μm, pulse width of 7 ns FWHM focused to spot of 200 μm. The velocities, size, and topological structure of the ejected particles are measured. The radii of the ejecta are in the range 0.5–7 μm.

Type
Research Article
Information
Laser and Particle Beams , Volume 14 , Issue 2 , June 1996 , pp. 133 - 147
Copyright
Copyright © Cambridge University Press 1996

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