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Modeling of the plasma produced by moderate energy laser beam interaction with metallic targets: Physics of the phenomena

Published online by Cambridge University Press:  15 June 2012

Isak I. Beilis
Isak I. Beilis*
Affiliation:
Electrical Discharge and Plasma Laboratory, School of Electrical Engineering, Fleischman Faculty of Engineering, Tel Aviv University, Tel Aviv, Israel
*
Address correspondence and reprint requests to: Isak I. Beilis, Electrical Discharge and Plasma Laboratory, School of Electrical Engineering, Fleischman Faculty of Engineering, Tel Aviv University, P. O. Box 39040, Tel Aviv 69978, Israel. E-mail: beilis@eng.tau.ac.il
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Abstract

The physical phenomena of plasma plume generation and plasma expansion by target-laser interaction are considered for moderate laser power density. The kinetics of target vaporization, atom ionization, and plasma heating are described. The mechanism of electric sheath formation near the surface, electron emission from the target, and the electrical breakdown phenomena by laser irradiation are analyzed. The plasma expansion is described taking into account the near target plasma structure and the absorption of the laser radiation. The mechanisms accelerating the plasma and generating an electric field in it are discussed. The work reviews experiments and theoretical models and summarizes the results in order to understand the measurements and to discuss open questions. As example, the plasma parameters (electron temperature and density, degree of ionization, and plasma velocity) are calculated for an Ag target using the developed model that considers self-consistently the target heating, kinetics of target evaporation, plasma heating, and ion flux to the target. The calculated ion velocity in the expanding plasma jet is in accordance with the measurement. The ion energy linearly depends on the ion charge state, as observed experimentally.

Keywords

Electron emissionIon chargeLaser plasmaPlasma expansionSheathTarget ablation

Information

Type
Research Article
Information
Laser and Particle Beams , Volume 30 , Issue 3 , September 2012 , pp. 341 - 356
Copyright
Copyright © Cambridge University Press 2012

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