Experimental and theoretical investigations of a laser-produced aluminum plasma.
The formation and dynamics of a laser-produced aluminum plasma have been experimentally and theoretically investigated. The visible-emitting regions of the plasma form two structures with different lifetimes and expansion velocities. The first part of the transient ionic signal simultaneously recorded by a Langmuir probe presents an oscillatory structure. A hydrodynamic model in a nondifferentiable space-time has been established. The numerical simulation of the plasma expansion showed the plasma plume separation into two patterns. Moreover, the self-structuring of the interface appears through a negative differential conductance and the current oscillations are explained as being induced by thermal fluctuations that appear in the plasma cooling processes.
Faculty of Physics, "Al. I. Cuza" University, Boulevard Carol I no. 11, Iasi 700506, Romania.
S
S
Gurlui
M
M
Agop
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P
Nica
M
M
Ziskind
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C
Focsa