TY  - JOUR
AU  - Reich, Ch.
AU  - Uschmann, I.
AU  - Ewald, F.
AU  - Düsterer, S.
AU  - Lübcke, A.
AU  - Schwoerer, H.
AU  - Sauerbrey, R.
AU  - Förster, E.
AU  - Gibbon, P.
TI  - Spatial characteristics of K alpha X-ray emission from relativistic femtosecond laser plasmas
JO  - Physical review / E
VL  - 68
IS  - 5
SN  - 1063-651X
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-31495
SP  - 056408
PY  - 2003
N1  - Record converted from VDB: 12.11.2012
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000187183600066
DO  - DOI:10.1103/PhysRevE.68.056408
UR  - https://juser.fz-juelich.de/record/31495
ER  -