A measurement of the reduction of the range of fast electrons from laser irradiated targets due to density structure in low density gold substrates

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Abstract
The range of fast electrons from high intensity 1.05 mu m laser plasma interactions is shown to be reduced by a factor of 2.5 from the classical value in targets with low density gold substrates. This is shown to be due to a resistive electric field. Comparison with a one-dimensional numerical simulation shows that the apparent resistivity is increased by a factor of 10 from the Spitzer value, possibly due to persistent density structure.