Study of Ultraintense Laser-Produced Fast-Electron Propagation and Filamentation in Insulator and Metal Foil Targets by Optical Emission Diagnostics Article - Mars 2006

M. Manclossi, J.J. Santos, D. Batani, Jérôme Faure, A. Debayle, V. T. Tikhonchuk, Victor Malka

M. Manclossi, J.J. Santos, D. Batani, Jérôme Faure, A. Debayle, V. T. Tikhonchuk, Victor Malka, « Study of Ultraintense Laser-Produced Fast-Electron Propagation and Filamentation in Insulator and Metal Foil Targets by Optical Emission Diagnostics  », Physical Review Letters, mars 2006, p. 125002. ISSN 0031-9007

Abstract

The transport of an intense electron beam produced by ultrahigh intensity laser pulses through metals and insulators has been studied by high resolution imaging of the optical emission from the targets. In metals, the emission is mainly due to coherent transition radiation, while in plastic, it is due to the Čerenkov effect and it is orders of magnitude larger. It is also observed that in the case of insulators the fast-electron beam undergoes strong filamentation and the number of filaments increases with the target thickness. This filamented behavior in insulators is due to the instability of the ionization front related to the electric field ionization process. The filamentary structures characteristic growth rate and characteristic transversal scale are in agreement with analytical predictions.

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