Schematic of the interaction of two nonaligned intense laser pulses with a rarefied plasma. The two pulses are identical except in the polarization. They are lunched into the simulation box from the left boundary with an inter-laser angle and separation distance d.
For , the electron density at (a) t = 40, (b) t = 65, (c) t = 150, and (d) t = 300.
Properties of the energetic electrons (of energy ) for the merged electron bunch at t = 150. As reference, the properties of the energetic electrons generated by a single laser pulse along the x-axis at the same time are also shown. (a) Energy spectra. Inset: the divergence angle. (c) Charge distribution in the longitudinal direction.
The merging process of the two groups of energetic electrons depicted in the phase space . py is normalized by , with me the electron mass and c the light speed. Electrons are colored according to the laser pulses. The snapshot of the energetic electrons at t = 65 (a) and t = 150 (b). The trajectories of two energetic electrons plotted in the real space (c) and in the phase space (d).
(a) Distribution of the effective focusing field Fy at t = 150. (b) Evolution of . Fy is normalized by , with ω the laser frequency and e the electron charge.
Effect of the inter-laser angle θ on the merging process of the electron bunches. (a) Variation of the maximum-density distance, DMD , as a function of t for , 0.09, and 0.15. (b) The variation of the averaged transverse position, YAP , as a function of t for and 0.15. For comparison, the variation of YAP for the case of a single-laser propagating along the axis is also given.
By 3D PIC simulations, the energetic electron density at t = 100 shown in (a) the (x, y) plane, (b) the (x, z) plane, and (c) the (y, z) plane.
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