Isochoric heating and strong blast wave formation driven by fast electrons in solid-density targets Article - Octobre 2017

J Santos, B Vauzour, M. Touati, L. Gremillet, J-L Feugeas, T. Ceccotti, R Bouillaud, F Deneuville, V Floquet, C Fourment, M Hadj-Bachir, S. Hulin, A Morace, P. Nicolai, P. D’oliveira, F. Reau, A Samaké, O. Tcherbakoff, V T Tikhonchuk, M. Veltcheva, D. Batani

J Santos, B Vauzour, M. Touati, L. Gremillet, J-L Feugeas, T. Ceccotti, R Bouillaud, F Deneuville, V Floquet, C Fourment, M Hadj-Bachir, S. Hulin, A Morace, P. Nicolai, P. D’oliveira, F. Reau, A Samaké, O. Tcherbakoff, V T Tikhonchuk, M. Veltcheva, D. Batani, « Isochoric heating and strong blast wave formation driven by fast electrons in solid-density targets  », New Journal of Physics, octobre 2017, p. 103005. ISSN 1367-2630

Abstract

We experimentally investigate the fast ($<1$ ps) isochoric heating of multi-layer metallic foils and subsequent high-pressure hydrodynamics induced by energetic electrons driven by high-intensity, high-contrast laser pulses. The early-time temperature profile inside the target is measured from the streaked optical pyrometry of the target rear side. This is further characterized from benchmarked simulations of the laser-target interaction and the fast electron transport. Despite a modest laser energy ($<1$ J), the early-time high pressures and associated gradients launch inwards a strong compression wave developing over $>\atop\sim$10 ps into a $\approx$ 140 Mbar blast wave, according to hydrodynamic simulations, consistent with our measurements. These experimental and numerical findings pave the way to a short-pulse-laser-based platform dedicated to high-energy-density physics studies.

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