Ion dynamics and coherent structure formation following laser pulse self-channeling

Details Ion dynamics and coherent structure formation following laser pulse self-channeling Ion dynamics and coherent structure formation following laser pulse self-channeling

2007-08-21

arxiv.org/abs/0708.2780v1

Physics

Plasma Physics

10 pages, 5 figures (visit http://www.df.unipi.it/~macchi to download a high-resolution version), to appear in Plasma Physics

Scientific paper

10.1088/0741-3335/49/12B/S05

The propagation of a superintense laser pulse in an underdense, inhomogeneous plasma has been studied numerically by two-dimensional particle-in-cell simulations on a time scale extending up to several picoseconds. The effects of the ion dynamics following the charge-displacement self-channeling of the laser pulse have been addressed. Radial ion acceleration leads to the ``breaking'' of the plasma channel walls, causing an inversion of the radial space-charge field and the filamentation of the laser pulse. At later times a number of long-lived, quasi-periodic field structures are observed and their dynamics is characterized with high resolution. Inside the plasma channel, a pattern of electric and magnetic fields resembling both soliton- and vortex-like structures is observed.

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