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Interaction of two plasma jets produced successively from Cu target

Published online by Cambridge University Press:  07 September 2010

A. Kasperczuk
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
T. Pisarczyk*
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
J. Badziak
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
S. Borodziuk
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
T. Chodukowski
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
P. Parys
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
J. Ullschmied
Affiliation:
Institute of Plasma Physics ASCR, v.v.i., Prague, Czech Republic
E. Krousky
Affiliation:
Institute of Physics ASCR, v.v.i., Prague, Czech Republic
K. Masek
Affiliation:
Institute of Physics ASCR, v.v.i., Prague, Czech Republic
M. Pfeifer
Affiliation:
Institute of Physics ASCR, v.v.i., Prague, Czech Republic
K. Rohlena
Affiliation:
Institute of Physics ASCR, v.v.i., Prague, Czech Republic
J. Skala
Affiliation:
Institute of Physics ASCR, v.v.i., Prague, Czech Republic
P. Pisarczyk
Affiliation:
Warsaw University of Technology, ICS, Warsaw, Poland
*
Address correspondence and reprint requests to: Tadeusz Pisarczyk, Institute of Plasma Physics and Laser Microfusion, 23 Hery St., 00-908 Warsaw, Poland. E-mail: [email protected]

Abstract

Our earlier papers demonstrate a very simple method of plasma jet formation, consisting in irradiating a massive planar target of a relatively high atomic number by a partly defocused laser beam. Our present interest is concentrated on interaction of the plasma jet with other media. This paper is aimed at investigations of interaction of two jets launched successively on Cu target. Our attention was paid to the role of radiative cooling in the plasma jet formation. The experiment was carried out at the PALS iodine laser facility. The laser provided a 250-ps (full width at half maximum) pulse with energy of 130 J at the third harmonic frequency (λ3 = 0.438 µm). Two successive jets were produced on a massive flat Cu target provided with a cylindrical channel 5 mm long and 400 µm in diameter. Since the focal spot diameter of the laser beam on the target surface was larger than that of the channel (800 µm), the annular irradiation of the target face resulted in creation of the first plasma jet, whereas the second jet was produced by action of the central part of laser beam on the channel wall. Three-frame interferometric system, X-ray streak camera, and a set of ion collectors were used as diagnostic tools.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2010

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