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Laser-Initiated Diverging and Converging Spherical Blast Waves

F. Bredice, I. Deha†, F. Giammanco, A. Salvetti, D. P. Singh, M. Vaselli, E. Panarella, S. del Tredici

Fusion Science and Technology

Volume 27 / Number 3 / May 1995 / Pages 215-220


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In a study that is preliminary to a spherical pinch experiment, attention is focused on divergent and convergent shock waves. An intense laser beam is used to initiate a gas breakdown to generate a divergent shock wave at the center of a spherical cell; the temporal evolution of the shock front is tracked by holographic interferometry. A convergent shock wave is produced from the laser-induced evaporation of a metallic layer present on the internal surface of a hemi-spherical cell; a framing camera is employed to obtain streak pictures. Theoretical models are used to interpret the experimental results.

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