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P: Plasmaphysik
P 9: Dense Plasmas and Plasma Diagnostic (Poster Session)
P 9.14: Poster
Tuesday, April 3, 2001, 12:30–15:00, AT2
Time-resolved studies of head-on colliding laser plasmas — •Zeljko Andrei1, Samir Ellwi2, Lutz Aschke3, and Hans-Joachim Kunze2 — 1Rudjer Bo/vskovi/’c Institute, Div. of Materials Science, pp 180, Zagreb, Croatia — 2Institute for Experimental Physics V, Ruhr University Bochum, 44780 Bochum, Germany — 3Schott ML GmbH, Wilhelm-Theodor-Römheld str. 32, Mainz, Germany
By focusing a laser beam through a small capillary made of polyethylene onto a second target made of glassy carbon placed behind it, two plasmas are created. A cold plasma is obtained by ablation of the capillary wall, and a hot plasma by ablation of the second target. These plasmas expand directly toward each other, producing a head-on collision with a large relative velocity of the colliding plasma clouds. The dynamics of the collision and the formation of the collision zone is studied by time-resolved XUV pinhole imaging. The collision zone itself is studied by fast XUV spectroscopy. It was found that the collision zone is almost stationary and long living, being visible long after the plasmas that created it disappear out of view.