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Ion turbulence and thermal transport in laser-produced plasmas

Published online by Cambridge University Press:  13 March 2009

H. C. Barr  and
T. J. M. Boyd
H. C. Barr
Affiliation:
University of Wales, U.C.N.W., Bangor, LL57 2UW
T. J. M. Boyd
Affiliation:
University of Wales, U.C.N.W., Bangor, LL57 2UW
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Abstract

In the interaction of high-intensity lasers with target plasmas the transport of thermal enelgy from the region in which the radiation is absorbed, to the cold dense plasma in the interior of the target, is an issue of central importance. It is also one of great complexity and as such is still largely unresolved. Ion-acoustic turbulence, self-generated magnetic fields and the inadequacy of classical transport theory have all been widely canvassed by way of explaining the observations which show thermal transport much reduced below what would be expected from conventional arguments.

In this paper the role of ion turbulence as a flux limiter is addressed with particular regard to recent experiments in which target plasmas were irradiated by 1·06 µm neodymium laser light at irradiances of 1015W cm−2 and greater. Saturation levels of the ion-acoustic turbulence driven by a combination of a suprathermal electron current and a heat flux have been calculated on the basis of perturbed orbit theory.

The levels of turbulence are found to be markedly lower than those commonly estimated from simple trapping arguments and too low to explain the thermal flux inhibition observed in the experiments used as a basis for the model.

Type
Research Article
Information
Journal of Plasma Physics , Volume 27 , Issue 3 , June 1982 , pp. 525 - 542
Copyright
Copyright © Cambridge University Press 1982

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