Breaking of a wake wave excited by a narrow laser pulse in a low-density plasma |
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Authors: | A A Frolov E V Chizhonkov |
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Institution: | 1.Joint Institute for High Temperatures,Russian Academy of Sciences,Moscow,Russia;2.Moscow State University,Moscow,Russia |
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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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