Abstract
Basing on a previously developed electron cascade model by Evans and Gamal (1980), a study is performed to investigate the electron kinetics in the breakdown of argon by an optical frequency laser radiation (0.53 {mu}m) with pulse length 15 ns. The model solves simultaneously the time dependent Boltzmann equation for the electron energy distribution function and a set of rate equations describing the rate of change of the population density of the formed excited states. The model takes into account all the possible electron, atom and photon interactions. The actual correlation between the cross-sections and rate coefficients of the possible physical processes and the electron energy is considered in this analysis. The computations are carried out under the experimental conditions of Rosen and Weyl (1987). The calculated breakdown parameters are found to be in accordance with the measured ones. Moreover, the importance of each loss process considered in this work as well as the contribution of the secondary ionization processes are tested over the pressure range examined experimentally. It is shown that at low pressure regime breakdown is governed by a diffusion loss process while at high pressures recombination losses dominate. On the other hand, the secondary ionization processes are
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Gamal, Y E.E.D.
[1]
- National Institute of Laser Enhanced Sciences, Cairo University, El-Giza (Egypt)
Citation Formats
Gamal, Y E.E.D.
On the study of the electron kinetic processes in the breakdown of argon by optical laser radiation.
IAEA: N. p.,
1999.
Web.
Gamal, Y E.E.D.
On the study of the electron kinetic processes in the breakdown of argon by optical laser radiation.
IAEA.
Gamal, Y E.E.D.
1999.
"On the study of the electron kinetic processes in the breakdown of argon by optical laser radiation."
IAEA.
@misc{etde_10147173,
title = {On the study of the electron kinetic processes in the breakdown of argon by optical laser radiation}
author = {Gamal, Y E.E.D.}
abstractNote = {Basing on a previously developed electron cascade model by Evans and Gamal (1980), a study is performed to investigate the electron kinetics in the breakdown of argon by an optical frequency laser radiation (0.53 {mu}m) with pulse length 15 ns. The model solves simultaneously the time dependent Boltzmann equation for the electron energy distribution function and a set of rate equations describing the rate of change of the population density of the formed excited states. The model takes into account all the possible electron, atom and photon interactions. The actual correlation between the cross-sections and rate coefficients of the possible physical processes and the electron energy is considered in this analysis. The computations are carried out under the experimental conditions of Rosen and Weyl (1987). The calculated breakdown parameters are found to be in accordance with the measured ones. Moreover, the importance of each loss process considered in this work as well as the contribution of the secondary ionization processes are tested over the pressure range examined experimentally. It is shown that at low pressure regime breakdown is governed by a diffusion loss process while at high pressures recombination losses dominate. On the other hand, the secondary ionization processes are acting effectively to overcome these loss processes over the whole pressure range. (author) 17 refs, 6 figs}
place = {IAEA}
year = {1999}
month = {Mar}
}
title = {On the study of the electron kinetic processes in the breakdown of argon by optical laser radiation}
author = {Gamal, Y E.E.D.}
abstractNote = {Basing on a previously developed electron cascade model by Evans and Gamal (1980), a study is performed to investigate the electron kinetics in the breakdown of argon by an optical frequency laser radiation (0.53 {mu}m) with pulse length 15 ns. The model solves simultaneously the time dependent Boltzmann equation for the electron energy distribution function and a set of rate equations describing the rate of change of the population density of the formed excited states. The model takes into account all the possible electron, atom and photon interactions. The actual correlation between the cross-sections and rate coefficients of the possible physical processes and the electron energy is considered in this analysis. The computations are carried out under the experimental conditions of Rosen and Weyl (1987). The calculated breakdown parameters are found to be in accordance with the measured ones. Moreover, the importance of each loss process considered in this work as well as the contribution of the secondary ionization processes are tested over the pressure range examined experimentally. It is shown that at low pressure regime breakdown is governed by a diffusion loss process while at high pressures recombination losses dominate. On the other hand, the secondary ionization processes are acting effectively to overcome these loss processes over the whole pressure range. (author) 17 refs, 6 figs}
place = {IAEA}
year = {1999}
month = {Mar}
}