Some Features of Particle Ejection from the Surface of a Shocked Lead Sample
N. V. Nevmerzhitskii, V. A. Raevskii, E. A. Sotskov, E. D. Sen'kovskii, N. B. Davydov, E. V. Bodrov, S. V. Frolov, K. V. Anisiforov, A. B. Georgievskaya, E.V. Levkina, O. L. Krivonos, A. S. Kuchkareva, A. R. Gavrish, B. I. Tkachenko
Russian Federal Nuclear Center - All-Russian Research Institute of Experimental Physics, Sarov, 607190 Russia
Keywords: ударная волна, свободная поверхность, выброс частиц, спектр частиц, микроскопическая видеосъемка, shock wave, free surface, ejection of particles, spectrum of particles, microscopic video
Abstract
This paper presents the results of an experimental study of the particle ejection into a low (0.05 atm) vacuum with a narrow (0.2-0.8 mm) rough (Rz = 20-50 μm) surface of the lead sample under the action of a shock wave of intensity about 17 and 34 GPa. The flow was recorded with a video camera in a microscopic mode with a short laser illumination. Due to the small optical thickness of the dust flow, particle spectra approximately 80% of its height measured from the front of the flow were obtained. It was found that when the lead is in the solid state (17 GPa), s jets consisting of a lot of particles are ejected from the rough surface; when the lead is in the liquid state (34 GPa) a lot of thin (from 7 μm) microcumulative jets are ejected from the metal surface, which with time decay into particles.
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