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The EM field Ez as a function of , where . The solid lines represent the theoretical results, and the dots represent the simulation results for (a) initial plasma density with different laser intensities; (b) with different external magnetic fields.
Panels (a)–(d) represent the simulation results at time when the laser pulse just propagates to the plasma vacuum boundary: (a) the snapshot of electron density and (b) the corresponding on-axis distribution; (c) the snapshot of Ez ; (d) the on-axis distributions for Ez (red solid curve) and Ex (blue dashed curve). The amplitude of Ex has been multiplied by the factor of 4.3 × 10−3 which is the theoretical amplitude ratio of Ez and Ex . The green curve represents the theoretical result for Ez , which agrees well with the numerical result. Panels (e)–(f) represent the simulation results at time in the vacuum for the field Ez (e) and the corresponding on-axis distribution (f).
(a) The spectrum of Ex in the plasma region for , (b) the spectra of Ez in the plasma region (blue dashed curve) and in the vacuum (the red solid curve) for , (c) the spectra of Ez in the vacuum for different laser intensities for and 2.0. Other parameters are the same with those of Fig. 2 .
The snapshots for the electron density (a), electromagnetic field Ez in the plasma region (b), and the on-axis distribution for Ex (black dashed curve) and Ez (red solid curve) (c) at . The on-axis distribution for Ez in the vacuum at is plotted in (d).
Spectra of the field Ez in vacuum due to the bubble structure (solid curve) and due to the broken wave structure behind the bubble structure (dashed curve). (b)Comparison of the electron-density distribution obtained from the inverse Fourier transformation (blue curve) and directly from the simulation result (red curve).
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