Multibeam effects on fast-electron generation from two-plasmon-decay instability |
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Authors: | Stoeckl C Bahr R E Yaakobi B Seka W Regan S P Craxton R S Delettrez J A Short R W Myatt J Maximov A V Baldis H |
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Institution: | Laboratory for Laser Energetics, University of Rochester, Rochester, NY 14623-1299, USA. |
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Abstract: | Experiments with multiple laser beams have been carried out in both spherical and planar geometry to study two-plasmon-decay instability, the predominant source of suprathermal electrons in direct-drive inertial confinement fusion experiments. These electrons are observed using the hard x rays generated through electron-target interactions. The experiments show for the first time that the total overlapped intensity governs the scaling of the suprathermal-electron generation regardless of the number of overlapped beams, in contrast to conventional theories that are based on the single-beam approximation. |
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