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Transverse structures in corona of nonuniformly irradiated solid targets

Published online by Cambridge University Press:  05 August 2002

J. LIMPOUCH ,
A.B. ISKAKOV ,
K. MAšEK ,
K. ROHLENA ,
I.G. LEBO  and
V.F. TISHKIN
J. LIMPOUCH
Affiliation:
Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Břehová 7, 115 19 Praha 1, Czech Republic
A.B. ISKAKOV
Affiliation:
Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Břehová 7, 115 19 Praha 1, Czech Republic Institute of Mathematical Modeling, RAS, Miusskaya sq. 4a, 125047 Moscow, Russia
K. MAšEK
Affiliation:
Institute of Physics of the Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Praha 8-Libeň, Czech Republic
K. ROHLENA
Affiliation:
Institute of Physics of the Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Praha 8-Libeň, Czech Republic
I.G. LEBO
Affiliation:
Lebedev Physical Institute, RAS, Leninskiy pr. 53, 117924 Moscow, Russia
V.F. TISHKIN
Affiliation:
Institute of Mathematical Modeling, RAS, Miusskaya sq. 4a, 125047 Moscow, Russia
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Abstract

Formation of transverse inhomogeneities in the corona of a solid target irradiated by an inhomogeneous main laser pulse and a uniform background pulse was observed experimentally via side-on shadowgraphy. The experimental results were successfully interpreted using a two-dimensional hydrodynamics code. Our simulations identified the onset of sharp contact boundaries between plasma streams of different expansion velocities. The formation and the decay of the contact boundaries is investigated in detail. When the background pulse is used as a laser prepulse, a layer of coronal plasma is formed that enhances main pulse collisional absorption in underdense plasma and creates conditions for an efficient thermal smoothing of the transverse inhomogeneities.

Keywords

Hydrodynamics modelLaser imprintLaser-produced plasmasThermal smoothing
Type
Research Article
Information
Laser and Particle Beams , Volume 20 , Issue 1 , January 2002 , pp. 93 - 99
Copyright
© 2002 Cambridge University Press

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