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Investigations of plasma jet interaction with ambient gases by multi-frame interferometric and X-ray pinhole camera systems

Published online by Cambridge University Press:  23 January 2009

A. Kasperczuk
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
T. Pisarczyk
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
Ph. Nicolai
Affiliation:
Centre Lasers Intenses et Applications, Universite Bordeaux, Talence, France
Ch. Stenz
Affiliation:
Centre Lasers Intenses et Applications, Universite Bordeaux, Talence, France
V. Tikhonchuk
Affiliation:
Centre Lasers Intenses et Applications, Universite Bordeaux, Talence, France
M. Kalal*
Affiliation:
Czech Technical University in Prague, FNSPE, Prague, Czech Republic
J. Ullschmied
Affiliation:
Institute of Plasma Physics AS CR, Prague, Czech Republic
E. Krousky
Affiliation:
Institute of Physics AS CR, Prague, Czech Republic
K. Masek
Affiliation:
Institute of Physics AS CR, Prague, Czech Republic
M. Pfeifer
Affiliation:
Institute of Physics AS CR, Prague, Czech Republic
K. Rohlena
Affiliation:
Institute of Physics AS CR, Prague, Czech Republic
J. Skala
Affiliation:
Institute of Physics AS CR, Prague, Czech Republic
D. Klir
Affiliation:
Czech Technical University in Prague, FEE, Prague, Czech Republic
J. Kravarik
Affiliation:
Czech Technical University in Prague, FEE, Prague, Czech Republic
P. Kubes
Affiliation:
Czech Technical University in Prague, FEE, Prague, Czech Republic
P. Pisarczyk
Affiliation:
Warsaw University of Technology, ICS, Warsaw, Poland
*
Address correspondence and reprint requests to: Milan Kalal, Czech Technical University in Prague, FNSPE, Brehova 7, 115 19 Prague 1, Czech Republic. E-mail: kalal@fjfi.cvut.cz

Abstract

Interactions of laser driven plasma jets with He and Ar gas puffs was investigated experimentally by means of three-frame interferometric/shadowgraphic system and three-frame X-ray pinhole camera. A defocused iodine laser beam using the Prague Asterix Laser System (PALS) interacting with massive planar Cu targets generated high-speed well-collimated plasma jets. The PALS third harmonic (0.438 µm), with pulse duration of 250 ps (full width at half maximum), and energy of 100 J was employed in two irradiation geometries: with an incidence normal to the target surface and with an oblique one (30° with respect to the target normal), in order to minimize the heating of the ambient gas by the laser beam. The results of these interaction experiments, in particular, those obtained in case of the oblique incidence geometry, are presented and discussed. They show the effect of the double shock formation in ambient gases: starting by the ablative plasma action, followed by that of the jet.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2009

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