Fast-electron transport and heating of solid targets in high-intensity laser interactions measured by K alpha fluorescence.
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.
Martinolli
E
E
Laboratoire pour l'Utilisation des Lasers Intenses, UMR7605, CNRS-CEA-Université Paris VI-Ecole Polytechnique, 91128 Palaiseau, France.
Koenig
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Baton
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Santos
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JJ
Amiranoff
F
F
Batani
D
D
Perelli-Cippo
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Scianitti
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Gremillet
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Mélizzi
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Decoster
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Rousseaux
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Hall
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Key
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Snavely
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MacKinnon
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Freeman
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King
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Stephens
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Neely
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Clarke
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