title: Fast-electron transport and heating of solid targets in high-intensity laser interactions measured by K alpha fluorescence.
abstract: We present experimental results on fast-electron energy deposition into solid targets in ultrahigh intensity laser-matter interaction. X-ray K alpha emission spectroscopy with absolute photon counting served to diagnose fast-electron propagation in multilayered targets. Target heating was measured from ionization-shifted K alpha emission. Data show a 200 microm fast-electron range in solid Al. The relative intensities of spectrally shifted Al K alpha lines imply a mean temperature of a few tens of eV up to a 100 microm depth. Experimental results suggest refluxing of the electron beam at target rear side. They were compared with the predictions of both a collisional Monte Carlo and a collisional-electromagnetic, particle-fluid transport code. The validity of the code modeling of heating in such highly transient conditions is discussed.
authors.affiliation: Laboratoire pour l'Utilisation des Lasers Intenses, UMR7605, CNRS-CEA-Université Paris VI-Ecole Polytechnique, 91128 Palaiseau, France.
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