Relativistic high-current electron-beam stopping-power characterization in solids and plasmas : collisional versus resistive effects

Vauzour, B. and Santos, J. J. and Debayle, A. and Hulin, S. and Schlenvoigt, H. -P. and Vaisseau, X. and Batani, D. and Baton, S. D. and Honrubia, J. J. and Nicolai, Ph. and Beg, F. N. and Benocci, R. and Chawla, S. and Coury, M. and Dorchies, F. and Fourment, C. and d'Humieres, E. and Jarrot, L. C. and McKenna, P. and Rhee, Y. J. and Tikhonchuk, V. T. and Volpe, L. and Yahia, V. (2012) Relativistic high-current electron-beam stopping-power characterization in solids and plasmas : collisional versus resistive effects. Physical Review Letters, 109 (25). 255002. ISSN 0031-9007

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Abstract

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-alpha 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 approximate to 8 x 10(10) A/cm(2) they reach 1.5 keV/mu m and 0.8 keV/mu m, 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/mu m 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.