Abstract
The spatial structure of a wake wave excited in a low-density plasma by a laser pulse with a small focal spot radius is studied both analytically and numerically. Numerical study shows that, in a small-amplitude laser field, a wake wave breaks after the formation of an off-axis density maximum, which grows in height away from the pulse to become infinitely high after several periods. Analytical and numerical calculations show that the singularity in the density arises from the intersection of the trajectories of neighboring particles. Numerical simulations demonstrate that, as the laser field amplitude increases, the breaking point of the wake wave rapidly approaches the pulse trailing edge. For weakly nonlinear conditions, an analytic dependence of the coordinate of the breaking point on the amplitude and transverse size of the laser pulse is obtained.
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Original Russian Text © A.A. Frolov, E.V. Chizhonkov, 2011, published in Fizika Plazmy, 2011, Vol. 37, No. 8, pp. 711–728.
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Frolov, A.A., Chizhonkov, E.V. Breaking of a wake wave excited by a narrow laser pulse in a low-density plasma. Plasma Phys. Rep. 37, 663–679 (2011). https://doi.org/10.1134/S1063780X11060080
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DOI: https://doi.org/10.1134/S1063780X11060080