Amplification of separated electric charge field due to the capture of laser-produced fast electrons oscillating near thin target

The effect of increasing strength of the electric field of separated charge due to the capture of laser-accelerated fast electrons in a thin solid target is theoretically substantiated. The target considered is so thin that a fast electron passes through the target during the time less than at least...

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Bibliographic Details
Published in:Physics of plasmas 2020-12, Vol.27 (12)
Main Author: Yu, Gus'kov S
Format: Article
Language:English
Subjects:
Amplification
Electric charge
Electric field strength
Electrons
Energy dissipation
Energy transfer
Lasers
Plasma physics
Sheaths
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Summary:The effect of increasing strength of the electric field of separated charge due to the capture of laser-accelerated fast electrons in a thin solid target is theoretically substantiated. The target considered is so thin that a fast electron passes through the target during the time less than at least half of the applied laser pulse with the additional requirement that energy loss of a fast electron in the balk target is negligible compared to the energy transfer to ions accelerated in a sheath field. An analytical model is proposed of sheath field formation when fast electrons oscillate due to their reflections in the double layers at both boundaries of a thin target. It is shown that the increasing density of fast electrons inside the double layer and shortening of this layer are the reasons of sheath field strength amplification in a thin target in comparison with a thick target. The increase in the number and the energy of fast ions due to field amplification in a thin target is discussed.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0023753