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23 April 2024

» pubmed » pmid16711934

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Fast-electron transport and heating of solid targets in high-intensity laser interactions measured by K alpha fluorescence
E Martinolli ; M Koenig ; S D Baton ; J J Santos ; F Amiranoff ; D Batani ; E Perelli-Cippo ; F Scianitti ; L Gremillet ; R Mélizzi ; A Decoster ; C Rousseaux ; T A Hall ; M H Key ; R Snavely ; A J MacKinnon ; R R Freeman ; J A King ; R Stephens ; D Neely ; R J Clarke ;
Date:	31 Mar 2006
Journal:	Phys Rev E, 73 (4 Pt 2), 046402
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.
Source:	PubMed, pmid16711934
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