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Effect of Electron Velocity Distribution on the Heating of Core by Corona in a Spherical Pellet

✍ Scribed by D. P. Singh; F. Bredice; F. Giammanco; M. Vaselli

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
267 KB
Volume
33
Category
Article
ISSN
0005-8025

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✦ Synopsis

Abstract

When a spherical plasma pellet is irradiated symmetrically from all sides by high power laser beams, hot electrons are produced at the plasma resonance layer. They move in the inward radial direction causing a counter‐streaming cold electron current flowing outwardly to maintain the charge neutrality. In general, the interaction between the hot electrons and the counter‐streaming cold background electrons leads to broadening of the velocity distribution of the latter. For a given heat flux, the electron velocity distribution constrained by the requirements for not supporting beam plasma instabilities, predicts a minimum electron velocity in the plasma ablation zone. These considerations affect the efficiency of heat transfer from the hot corona to the cold core. The purpose of this paper is to study the dependence of core‐corona coupling on the electron velocity distribution, laser wavelength and other plasma parameters in detail.

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