%0 Journal Article
%A Reich, Ch.
%A Uschmann, I.
%A Ewald, F.
%A Düsterer, S.
%A Lübcke, A.
%A Schwoerer, H.
%A Sauerbrey, R.
%A Förster, E.
%A Gibbon, P.
%T Spatial characteristics of K alpha X-ray emission from relativistic femtosecond laser plasmas
%J Physical review / E
%V 68
%N 5
%@ 1063-651X
%C College Park, Md.
%I APS
%M PreJuSER-31495
%P 056408
%D 2003
%Z Record converted from VDB: 12.11.2012
%X The spatial structure of the Kalpha emission from Ti targets irradiated with a high intensity femtosecond laser has been studied using a two-dimensional monochromatic imaging technique. For laser intensities I<5x10(17) W/cm(2), the observed spatial structure of the Kalpha emission can be explained by the scattering of the hot electrons inside the solid with the help of a hybrid particle-in-cell/Monte Carlo model. By contrast, at the maximum laser intensity I=7x10(18) W/cm(2) the half-width of the Kalpha emission was 70 mum compared to a laser-focus half-width of 3 mum. Moreover, the main Kalpha peak was surrounded by a halo of weak Kalpha emission with a diameter of 400 mum and the Kalpha intensity at the source center did not increase with increasing laser intensity. These three features point to the existence of strong self-induced fields, which redirect the hot electrons over the target surface.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000187183600066
%R 10.1103/PhysRevE.68.056408
%U https://juser.fz-juelich.de/record/31495