Relativistic high-current electron-beam stopping-power characterization in solids and plasmas: collisional versus resistive effects.
We present experimental and numerical results on intense-laser-pulse-produced fast electron beams transport through aluminum samples, either solid or compressed and heated by laser-induced planar shock propagation. Thanks to absolute K(α) yield measurements and its very good agreement with results from numerical simulations, we quantify the collisional and resistive fast electron stopping powers: for electron current densities of ≈ 8 × 10(10) A/cm(2) they reach 1.5 keV/μm and 0.8 keV/μm, respectively. For higher current densities up to 10(12)A/cm(2), numerical simulations show resistive and collisional energy losses at comparable levels. Analytical estimations predict the resistive stopping power will be kept on the level of 1 keV/μm for electron current densities of 10(14)A/cm(2), representative of the full-scale conditions in the fast ignition of inertially confined fusion targets.
Univ Bordeaux, CNRS, CEA, CELIA, Centre Lasers Intenses et Applications, UMR 5107, F-33405 Talence, France.
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Vauzour
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Santos
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Debayle
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Hulin
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Schlenvoigt
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Vaisseau
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Batani
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Honrubia
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Nicolaï
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Benocci
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Dorchies
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Rhee
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Tikhonchuk
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Yahia