Physics – Plasma Physics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dppvo2007w&link_type=abstract
American Physical Society, 42nd Annual Meeting of the APS Division of Plasma Physics combined with the 10th International Congre
Physics
Plasma Physics
Scientific paper
``Self-smoothing'' of high intensity laser beams through plasma arises from a combination of filamentation, speckle self-focussing and forward Brillouin scattering. The transmitted light spreads in angle and is spectrally broadened as it propagates through the plasma. This behaviour was observed in the transmitted near field in experiments where a KPP-smoothed Nova laser beam was propagated through a helium/hydrogen filled ``gasbag'' target. We show modeling of these experiments with the parallel F3D code, which combines a self-consistent fluid treatment of the target plasma with paraxial propagation of the laser (and backscattered) light. More recent experiments on the Vulcan laser placed a mask in the near field. With increases in laser path-length and/or intensity, the image of the mask in the transmitted near field became more blurred, showing the anticipated increase in self-smoothing. We likewise attempt to model these experiments quantitatively with the F3D code.
Berger Richard L.
Decker C. D.
Divol Laurent
Glenzer Siegfried H.
Langdon Bruce A.
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