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Angular distributions of ions from laser-produced plasma

Published online by Cambridge University Press:  01 April 1999

E. WORYNA
Affiliation:
Institute of Plasma Physics and Laser Microfusion, 00-908 Warsaw 49, 23 Hery St., Poland
P. PARYS
Affiliation:
Institute of Plasma Physics and Laser Microfusion, 00-908 Warsaw 49, 23 Hery St., Poland
J. WOŁOWSKI
Affiliation:
Institute of Plasma Physics and Laser Microfusion, 00-908 Warsaw 49, 23 Hery St., Poland
J. KRÁSA
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, 180 40 Prague 8, Na Slovance 2, Czech Republic
L. LÁSKA
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, 180 40 Prague 8, Na Slovance 2, Czech Republic
B. KRÁLIKOVÁ
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, 180 40 Prague 8, Na Slovance 2, Czech Republic
M. PFEIFER
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, 180 40 Prague 8, Na Slovance 2, Czech Republic
K. ROHLENA
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, 180 40 Prague 8, Na Slovance 2, Czech Republic
J. SKÁLA
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, 180 40 Prague 8, Na Slovance 2, Czech Republic

Abstract

This paper presents comprehensive experimental results of angular distributions of ions emitted from laser-produced plasmas. Performing a series of laser shots onto planar Sn, Au, and Pb targets, both the focusing conditions as well as the tilt angle of the target were changed to study the effect on the plasma expansion. In the experiments, the iodine laser system PERUN (laser energy of 30 J in 350 ps of duration) with laser power density of 5 × 1014 W/cm2 was used. For plasma diagnostics four ion collectors and an ion-energy analyzer were applied. Comparison of angular distribution of the fast ion group (velocity within the range of 1–3.4 × 108 cm/s) and of the slow ion group (velocity within the range of 0.14–1 × 108 cm/s) shows distinct differences. The preferred direction of ion emission of these groups depends seriously on focusing conditions. When setting the focus on the in-focus position both groups of ions are peaked in the direction close to the target normal. The maximum charge of ions registered by the ion-energy analyzer were 36+, 51+, and 49+ for Sn, Au, and Pb, respectively.

Type
Research Article
Copyright
© 1999 Cambridge University Press

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