Multi-peak structure of the ion current in laser produced plasma

The experimental multi-peak structure of the transient ion current recorded by a charge-collector probe during the laser produced plasma expansion is reported for Sn and Li targets, and various focusing conditions and laser beam energies. Using a simple hydrodynamic model, the numerical simulations can reproduce well this type of behavior. Theoretically, a fractal hydrodynamic model is developed in a non-differentiable space-time. The solutions of Gaussian wave packet and ‘bouncing’ Gaussian wave packets types are found to explain the plasma expansion and to give a reasonable mathematical description of plasma splitting process.