Regular Article

The European Physical Journal D

, 66:298

First online:

Fast electron penetration in laser-irradiated solids

  • F. Y. KhattakAffiliated withDepartment of Physics, Kohat University of Science and Technology
  • , E. Garcia SaizAffiliated withCentre for Plasma Physics, School of Mathematics and Physics, Queens University Belfast
  • , P. GibbonAffiliated withJuelich Supercomputing Centre, Institute for Advanced Simulation, Forschungszentrum Juelich GmbH
  • , A. KarmakarAffiliated withJuelich Supercomputing Centre, Institute for Advanced Simulation, Forschungszentrum Juelich GmbH
  • , T. W. J. DzelzainisAffiliated withCentre for Plasma Physics, School of Mathematics and Physics, Queens University Belfast
  • , C. L. S. LewisAffiliated withCentre for Plasma Physics, School of Mathematics and Physics, Queens University Belfast
  • , A. P. L. RobinsonAffiliated withCentral Laser Facility, Rutherford Appleton Laboratory
  • , M. ZepfAffiliated withCentre for Plasma Physics, School of Mathematics and Physics, Queens University Belfast
  • , D. RileyAffiliated withCentre for Plasma Physics, School of Mathematics and Physics, Queens University Belfast Email author 

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Abstract

In this letter we present data comparing the yield of Cu K-α radiation for foils of differing thickness irradiated with a Ti:Sapphire laser generating 40 fs pulses at 800 nm and incident at 45°. At tight focus, the yields for all thicknesses are similar, whilst away from best focus there are clear differences. We discuss the origin of these similarities and differences in terms of the penetration of fast electrons into the foil and the possible importance of refluxing of fast electrons as they reach the non-irradiated side of the foil.

Keywords

Plasma Physics