This title appears in the Scientific Report : 2003 

Spatial characteristics of K alpha X-ray emission from relativistic femtosecond laser plasmas
Reich, Ch.
Uschmann, I. / Ewald, F. / Düsterer, S. / Lübcke, A. / Schwoerer, H. / Sauerbrey, R. / Förster, E. / Gibbon, P.
Zentralinstitut für Angewandte Mathematik; ZAM
Physical review / E, 68 (2003) S. 056408
College Park, Md. APS 2003
Journal Article
Betrieb und Weiterentwicklung des Höchstleistungsrechners
Physical Review E 68
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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.