Augsburg 2006 – scientific programme
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P: Plasmaphysik
P 14: Schwerionen- und lasererzeugte Plasmen 1
P 14.6: Talk
Tuesday, March 28, 2006, 16:00–16:15, 1004
Characteristics of high temperature plasmas with low flux lasers — •Gonzalo Rodríguez Prieto1, Gabriel Schaumann1,2, Thomas Hessling1,2, Abel Blazevic1,2, Marius Schollmeier1, Svitlana Korostiy1,2, and Dieter H. H. Hoffmann1,2 — 1GSI, Plankstrasse 1 64291 DA — 2TU Darmstadt, Institut für Kernphysik
Experimental studies with the nhelix laser facility in GSI generating a Magnesium plasma were performed. At these experiments X-ray and UV spectrometers together with visible streak and X-ray pinhole cameras heve been used to characterize the plasma. Even with low laser fluxes (1011 W/cm2) high temperature plasmas could be obtained due to special focus geometry. The plasma was created with an annular flux with the focus at a plane in front of the target surface. The plasma emission follows a gaussian emision law with two well defined plasma regions: a bigger and colder region close to the target, and the small high temperature region in the best focus. The influence of the intensity focal distribution and the focus position with respect to the target on the plasma characteristics was also studied. The plasma emission cone could be converted from a gaussian shape to a cilinder, if the focus is located not directly on the target but some hundred micrometers in front of it. In this configuration the plasma expands to bigger volumes but with lower temperatures.