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Skin depth plasma front interaction mechanism with prepulse suppression to avoid relativistic self-focusing for high-gain laser fusion

Published online by Cambridge University Press:  01 March 2004

F. OSMAN
Affiliation:
School of Quantitative Methods & Mathematical Sciences, University of Western Sydney, Penrith South, Australia
YU CANG
Affiliation:
School of Quantitative Methods & Mathematical Sciences, University of Western Sydney, Penrith South, Australia
H. HORA
Affiliation:
Department of Theoretical Physics, University of New South Wales, Sydney, Australia
LI-HUA CAO
Affiliation:
Institute of Applied Physics and Computational Mathematics, Beijing, China
HONG LIU
Affiliation:
Institute of Applied Physics and Computational Mathematics, Beijing, China
XIANTU HE
Affiliation:
Institute of Applied Physics and Computational Mathematics, Beijing, China
J. BADZIAK
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
A.B. PARYS
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
J. WOLOWSKI
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
E. WORYNA
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
K. JUNGWIRTH
Affiliation:
Prague Advanced Laser Source (PALS) Institute of Physics and of Plasma Physics, Academy of Sciences, Czech Republic, Prague, Czech Republic
B. KRÁLIKOVA
Affiliation:
Prague Advanced Laser Source (PALS) Institute of Physics and of Plasma Physics, Academy of Sciences, Czech Republic, Prague, Czech Republic
J. KRÁSA
Affiliation:
Prague Advanced Laser Source (PALS) Institute of Physics and of Plasma Physics, Academy of Sciences, Czech Republic, Prague, Czech Republic
L. LÁSKA
Affiliation:
Prague Advanced Laser Source (PALS) Institute of Physics and of Plasma Physics, Academy of Sciences, Czech Republic, Prague, Czech Republic
M. PFEIFER
Affiliation:
Prague Advanced Laser Source (PALS) Institute of Physics and of Plasma Physics, Academy of Sciences, Czech Republic, Prague, Czech Republic
K. ROHLENA
Affiliation:
Prague Advanced Laser Source (PALS) Institute of Physics and of Plasma Physics, Academy of Sciences, Czech Republic, Prague, Czech Republic
J. SKÁLA
Affiliation:
Prague Advanced Laser Source (PALS) Institute of Physics and of Plasma Physics, Academy of Sciences, Czech Republic, Prague, Czech Republic
J. ULLSCHMIED
Affiliation:
Prague Advanced Laser Source (PALS) Institute of Physics and of Plasma Physics, Academy of Sciences, Czech Republic, Prague, Czech Republic

Abstract

Measurements of the ion emission from targets irradiated with neodymium glass and iodine lasers were analyzed and a very significant anomaly observed. The fastest ions with high charge number Z, which usually are of megaelectron volt energy following the relativistic self-focusing and nonlinear-force acceleration theory, were reduced to less than 50 times lower energies when 1.2 ps laser pulses of about 1 J were incident. We clarify this discrepancy by the model of skin depth plasma front interaction in contrast to the relativistic self-focusing with filament generation. This was indicated also from the unique fact that the ion number was independent of the laser intensity. The skin layer theory prescribes prepulse control and lower (near relativistic threshold) laser intensities for nonlinear-force-driven plasma blocks for high-gain ignition similar to light ion beam fusion.

Type
Research Article
Copyright
2004 Cambridge University Press

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