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Supra-thermal electron beam stopping power and guiding in dense plasmas

  • JOÃO JORGE SANTOS (a1), D. BATANI (a1), S. D. BATON (a2), F. N. BEG (a3), T. CECCOTTI (a4), A. DEBAYLE (a5), F. DORCHIES (a1), J.-L. FEUGEAS (a1), C. FOURMENT (a1), L. GREMILLET (a6), J. J. HONRUBIA (a5), S. HULIN (a1), A. MORACE (a7), P. NICOLAÏ (a1), F. PÉREZ (a2), H. SAWADA (a3), H.-P. SCHLENVOIGT (a2), V. T. TIKHONCHUK (a1), X. VAISSEAU (a1), B. VAUZOUR (a1) and M. WEI (a8)...

Fast-electron beam stopping mechanisms in media ranging from solid to warm dense matter have been investigated experimentally and numerically. Laser-driven fast electrons have been transported through solid Al targets and shock-compressed Al and plastic foam targets. Their propagation has been diagnosed via rear-side optical self-emission and Kα X-rays from tracer layers. Comparison between measurements and simulations shows that the transition from collision-dominated to resistive field-dominated energy loss occurs for a fast-electron current density ~5 × 1011 A cm−2. The respective increases in the stopping power with target density and resistivity have been detected in each regime. Self-guided propagation over 200μm has been observed in radially compressed targets due to ~1kT magnetic fields generated by resistivity gradients at the converging shock front.

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Journal of Plasma Physics
  • ISSN: 0022-3778
  • EISSN: 1469-7807
  • URL: /core/journals/journal-of-plasma-physics
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