A time-dependent two electron group model for a discharge excited he-sr recombination laser

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Abstract

A time-dependent two electron group model 2EGM, based on a biMaxwellian electron energy distribution function (eedf), has been developed to simulate the discharge kinetics in a high-current, high-repetition frequency, pulsed He-Sr recombination laser. A comparison is made between the results predicted by 2EGM and 1EGM (Maxwellian) simulations and experimental data corresponding to typical operating conditions of the laser. Results from the 2EGM indicate that during the current pulse, the high-energy tail region of the eedf is severely depleted due to both inelastic collisions between electrons and ground state helium atoms and incomplete thermalization via Coulomb collisions. This leads to a highly non-Maxwellian eedf, a feature which cannot be accommodated in the 1EGM simulation. In addition, the Het(23S), Sr, and Sr+ population densities predicted by the 2EGM are shown to be in close agreement with the experimental data, whereas the 1 EGM predicts a partitioning of energy between helium and strontium states which is inconsistent with the observed population densities.

LanguageEnglish
Pages1803-1810
Number of pages8
JournalJournal of Physics D: Applied Physics
Volume24
Issue number10
DOIs
Publication statusPublished - 14 Oct 1991

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energy distribution
distribution functions
electron energy
Distribution functions
Helium
Electrons
Lasers
lasers
Coulomb collisions
electrons
inelastic collisions
helium atoms
electron states
strontium
Strontium
high current
repetition
simulation
helium
Electron energy levels

Cite this

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title = "A time-dependent two electron group model for a discharge excited he-sr recombination laser",
abstract = "A time-dependent two electron group model 2EGM, based on a biMaxwellian electron energy distribution function (eedf), has been developed to simulate the discharge kinetics in a high-current, high-repetition frequency, pulsed He-Sr recombination laser. A comparison is made between the results predicted by 2EGM and 1EGM (Maxwellian) simulations and experimental data corresponding to typical operating conditions of the laser. Results from the 2EGM indicate that during the current pulse, the high-energy tail region of the eedf is severely depleted due to both inelastic collisions between electrons and ground state helium atoms and incomplete thermalization via Coulomb collisions. This leads to a highly non-Maxwellian eedf, a feature which cannot be accommodated in the 1EGM simulation. In addition, the Het(23S), Sr, and Sr+ population densities predicted by the 2EGM are shown to be in close agreement with the experimental data, whereas the 1 EGM predicts a partitioning of energy between helium and strontium states which is inconsistent with the observed population densities.",
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A time-dependent two electron group model for a discharge excited he-sr recombination laser. / Carman, R. J.

In: Journal of Physics D: Applied Physics, Vol. 24, No. 10, 14.10.1991, p. 1803-1810.

Research output: Contribution to journalArticleResearchpeer-review

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