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

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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New Journal of Physics, Institute of Physics: Open Access Journals, 2017, 19, pp.103005. 〈10.1088/1367-2630/aa806b〉
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J Santos, B Vauzour, M. Touati, L. Gremillet, J-L Feugeas, et al.. Isochoric heating and strong blast wave formation driven by fast electrons in solid-density targets. New Journal of Physics, Institute of Physics: Open Access Journals, 2017, 19, pp.103005. 〈10.1088/1367-2630/aa806b〉. 〈cea-01668961〉

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