Volume 100, Number 4, November 2012
|Number of page(s)||5|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||04 December 2012|
Prompt electrons driving ion acceleration and formation of a two-temperature plasma in nanosecond laser-ablation domain
1 INFN-Laboratori Nazionali del Sud - Via S. Sofia 62, I-95123 Catania, Italy, EU
2 Dipartimento di Fisica e Astronomia, Università di Catania - Via S. Sofia 64, I-95123 Catania, Italy, EU
3 INFN-Sezione di Catania - Via S. Sofia 64, I-95123 Catania, Italy, EU
(a) Present address: INFN-Laboratori Nazionali del Sud - Via S. Sofia 62, I-95123, Catania, Italy, EU; email@example.com
Received: 5 April 2012
Accepted: 8 November 2012
We present the results of an experiment on plasma generation via laser ablation at 1012 W/cm2 of power intensity and in a nanosecond domain. Prompt-electrons emission and complex plasma plume fragmentation were simultaneously observed for the first time in this laser intensity regime, along with a double electron temperature inside the plasma bulk surviving for a long time to the plume expansion. 1D PIC simulations are in agreement with experimental data as long as the emission of initial prompt electrons is considered. This assumption results to be the key to explain all the other experimental evidences.
PACS: 52.38.Mf – Laser ablation / 52.38.Kd – Laser-plasma acceleration of electrons and ions / 52.65.Rr – Particle-in-cell method
© EPLA, 2012
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