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Simultaneous measurement of self-generated magnetic fields and electron heat transport in dense plasma

Published online by Cambridge University Press:  04 September 2013

L. Lancia ,
C. Fourment ,
J. Fuchs ,
J.-L. Feugeas ,
Ph. Nicolai ,
S. Bastiani-Ceccotti ,
M. Gauthier ,
S. Hulin ,
M. Nakatsutsumi  and
M. Rabec-Le-Gloahec
...Show all authors
L. Lancia*
Affiliation:
LULI, École Plytechnique, Palaiseau, France SBAI, Università di Roma ‘La Sapienza’, Rome, Italy
C. Fourment
Affiliation:
Université de Bordeaux-CNRS-CEA, CELIA (Centre Lasers Intenses et Applications) UMR 5107, Talence, France
J. Fuchs
Affiliation:
LULI, École Plytechnique, Palaiseau, France
J.-L. Feugeas
Affiliation:
Université de Bordeaux-CNRS-CEA, CELIA (Centre Lasers Intenses et Applications) UMR 5107, Talence, France
Ph. Nicolai
Affiliation:
Université de Bordeaux-CNRS-CEA, CELIA (Centre Lasers Intenses et Applications) UMR 5107, Talence, France
S. Bastiani-Ceccotti
Affiliation:
LULI, École Plytechnique, Palaiseau, France
M. Gauthier
Affiliation:
Université de Bordeaux-CNRS-CEA, CELIA (Centre Lasers Intenses et Applications) UMR 5107, Talence, France
S. Hulin
Affiliation:
Université de Bordeaux-CNRS-CEA, CELIA (Centre Lasers Intenses et Applications) UMR 5107, Talence, France
M. Nakatsutsumi
Affiliation:
LULI, École Plytechnique, Palaiseau, France
M. Rabec-Le-Gloahec
Affiliation:
LULI, École Plytechnique, Palaiseau, France
J.J. Santos
Affiliation:
Université de Bordeaux-CNRS-CEA, CELIA (Centre Lasers Intenses et Applications) UMR 5107, Talence, France
G. Schurtz
Affiliation:
Université de Bordeaux-CNRS-CEA, CELIA (Centre Lasers Intenses et Applications) UMR 5107, Talence, France
*
Address correspondence and reprint request to: L. Lancia, Department SBAI, University of Rome, La Sapienza, Via Scarpa 16 00161, Roma, Italy. E-mail: livia.lancia@uniroma1.it
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Abstract

The role of self generated magnetic fields in the transport of a heat wave following a nanosecond laser irradiation of a solid target is investigated. Magnetic fields are expected to localize the electron carrying the heat flux but at the same time are affected in their evolution by the heat flux itself. We performed simultaneous measurements of heat wave propagation velocity within the target and magnetic fields developing on the target surface. These were compared to results obtained by numerical magneto-hydrodynamic modeling, including self-generated B fields. The comparison shows that longitudinal heat flow is overestimated in the simulations. Similarly, but most notably, the radial expansion of the magnetic fields is underestimated by the modeling. The two are likely linked, the more pronounced radial drift of B-fields induces a rotation of heat flux in the radial direction, and corresponding longitudinal heat flux inhibition. This suggests the need for improving present modeling of self-generated magnetic fields evolution in high power laser-matter interaction.

Keywords

Heat transportInertial confinement fusionProton probingSelf-generated magnetic fields
Type
Research Article
Information
Laser and Particle Beams , Volume 31 , Issue 4 , December 2013 , pp. 653 - 661
Copyright
Copyright © Cambridge University Press 2013 

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