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Ion production by lasers using high–power densities in a near infrared region

Published online by Cambridge University Press:  09 March 2009

K. Rohlena
Affiliation:
Institute of Physics, Academy of Science, Czech Republic Prague, Czech Republic
B. Králiková
Affiliation:
Institute of Physics, Academy of Science, Czech Republic Prague, Czech Republic
J. Krása
Affiliation:
Institute of Physics, Academy of Science, Czech Republic Prague, Czech Republic
L. Láska
Affiliation:
Institute of Physics, Academy of Science, Czech Republic Prague, Czech Republic
K. Mašek
Affiliation:
Institute of Physics, Academy of Science, Czech Republic Prague, Czech Republic
M. Pfeifer
Affiliation:
Institute of Physics, Academy of Science, Czech Republic Prague, Czech Republic
J. Skála
Affiliation:
Institute of Physics, Academy of Science, Czech Republic Prague, Czech Republic
P. Parys
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
J. Wołowski
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
E. Woryna
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
W. Mróz
Affiliation:
Institute of Optoelectronics, Military University of Technology, Warsaw, Poland
I. Roudskoy
Affiliation:
Institute of Theoretical and Experimental Physics, Moscow, Russia
O. Shamaev
Affiliation:
Institute of Theoretical and Experimental Physics, Moscow, Russia
B. Sharkov
Affiliation:
Institute of Theoretical and Experimental Physics, Moscow, Russia
A. Shumshurov
Affiliation:
Institute of Theoretical and Experimental Physics, Moscow, Russia
B.A. Bryunetkin
Affiliation:
MISDC State Research Center of Russia, NPO VNIIFTRI, 141570, Mendeleevo Moscow Region, Russia
H. Haseroth
Affiliation:
PS-Division, CERN, Geneva, Switzerland
J. Collier
Affiliation:
PS-Division, CERN, Geneva, Switzerland
A. Kuttenbeger
Affiliation:
PS-Division, CERN, Geneva, Switzerland
K. Langbein
Affiliation:
PS-Division, CERN, Geneva, Switzerland
H. Kugler
Affiliation:
PS-Division, CERN, Geneva, Switzerland

Abstract

Results are presented of experiments on ion production from Ta targets using a short pulse (350–600 ps in focus) illumination with focal power densities exceeding 1014 Wcm-2 at the wavelength of an iodine photodissociation laser (1.315 μm) and its harmonics. Strong evidence of the existence of tantalum ions with the charge state +45 near the target surface was obtained by X-ray spectroscopy methods. The particle diagnostics point to the existence of frozen high charge states (<53+) of Ta ions in the far expansion zone at about 2 m from the target. The measured charge state-ion energy distribution indicates the highest energy (>4 MeV) for the highest observed charge states. A tentative theoretical explanation of the observed anomalous charge state freezing phenomenon in the expanding plasma produced by a subnanosecond laser pulse is given.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1996

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