Fast-electron refluxing effects on anisotropic hard-x-ray emission from intense laser-plasma interactions

K. McKeever, M. Makita, G. Nersisyan, T. Dzelzainis, S. White, B. Kettle, B. Dromey, M. Zepf, G. Sarri, D. Doria, H. Ahmed, C. L. S. Lewis, D. Riley*

*Corresponding author for this work

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Abstract

Fast-electron generation and dynamics, including electron refluxing, is at the core of understanding high-intensity laser-plasma interactions. This field is itself of strong relevance to fast ignition fusion and the development of new short-pulse, intense, x-ray, gamma-ray, and particle sources. In this paper, we describe experiments that explicitly link fast-electron refluxing and anisotropy in hard-x-ray emission. We find the anisotropy in x-ray emission to be strongly correlated to the suppression of refluxing. In contrast to some previous work, the peak of emission is directly along the rear normal to the target rather than along either the incident laser direction or the specular reflection direction.

Original languageEnglish
Article number033107
Number of pages8
JournalPhysical Review E
Volume91
Issue number3
Early online date16 Mar 2015
DOIs
Publication statusPublished - 16 Mar 2015

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