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High-charge energetic electron bunch generated by intersecting laser pulses
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View: Figures


Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

For , the electron density at (a) t = 40, (b) t = 65, (c) t = 150, and (d) t = 300.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

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).

Image of FIG. 5.
FIG. 5.

(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.

Image of FIG. 6.
FIG. 6.

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.

Image of FIG. 7.
FIG. 7.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-charge energetic electron bunch generated by intersecting laser pulses