Question

Acceleration of ions due to the space charge effect within plasma

Answer 1

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Answer 2

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When the duration of laser pulse is comparable to the plasma wave period, the large-amplitude plasma wave can be driven by the laser. In the presence of a guiding magnetic field, the large-amplitude plasma wave of finite transverse extent and large phase velocity resonantly accelerates the electrons to a higher energy-level. For a small laser spot size the laser exerts an axial as well as the radial ponderomotive force on the electrons that creates a density depression on the laser axis. This electron depleted channel also creates a radial electric field (ion space-charge field). Acceleration of electrons in this channel is investigated, where the effect of ion space-charge field is considered, by solving the dynamical equations using a two-dimensional particle-in-cell code for particle acceleration. We observe that the spacecharge field plays an important role in electron energy gain during acceleration by a plasma wave in a magnetic plasma channel.



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