Computer modelling of a short-pulse excited dielectric barrier discharge xenon excimer lamp (λ ∼ 172 nm)

Research output: Contribution to journalArticleResearchpeer-review

Abstract

A detailed rate-equation analysis has been used to simulate the plasma kinetics in a pulsed-excited dielectric barrier discharge in xenon, under operating conditions where the discharge structure is spatially homogeneous. The one-dimensional model, incorporating 14 species and 70 reaction processes, predicts results that are in good agreement with experimental measurements of the electrical characteristics, and optical (vaccum-ultraviolet (VUV) and visible) pulse shapes. The model reveals that electrical breakdown of the discharge gap occurs via a fast-moving ionization/excitation wavefront that starts close to the anode dielectric and propagates towards the cathode at ∼3 × 105 m s-1. The wavefront appears as a result of successive avalanches of electrons that propagate across the discharge gap after release from the cathode dielectric. During breakdown, the mean electron energy in the bulk plasma is close to optimum for preferential excitation of the Xe* 1s4,5 states that feed the VUV emitting Xe*2 excimer states. Calculations suggest that the overall conversion efficiency from electrical energy to VUV output in the plasma is greater than 60%, with >99% of the light output emitted in the VUV. Parasitic processes that act to reduce the key Xe* 1s4,5 and Xe*2 populations are found to be essentially negligible. For pulsed excitation, the longer-term spatio-temporal behaviour of the electron/ions during the afterglow or inter-pulse period is important, resulting in a remnant 'pre-pulse' ion density of ∼ 1015 -3 close to the cathode dielectric. These ions bombard the cathode during the subsequent excitation period to release the secondary (seed) electrons required to achieve electrical breakdown.

LanguageEnglish
Pages19-33
Number of pages15
JournalJournal of Physics D: Applied Physics
Volume36
Issue number1
DOIs
Publication statusPublished - 7 Jan 2003

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Xenon
excimers
Electric lamps
xenon
luminaires
Cathodes
cathodes
Electrons
Wavefronts
Ions
pulses
Plasmas
electrical faults
excitation
electrons
output
electric power
afterglows
avalanches
Conversion efficiency

Cite this

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title = "Computer modelling of a short-pulse excited dielectric barrier discharge xenon excimer lamp (λ ∼ 172 nm)",
abstract = "A detailed rate-equation analysis has been used to simulate the plasma kinetics in a pulsed-excited dielectric barrier discharge in xenon, under operating conditions where the discharge structure is spatially homogeneous. The one-dimensional model, incorporating 14 species and 70 reaction processes, predicts results that are in good agreement with experimental measurements of the electrical characteristics, and optical (vaccum-ultraviolet (VUV) and visible) pulse shapes. The model reveals that electrical breakdown of the discharge gap occurs via a fast-moving ionization/excitation wavefront that starts close to the anode dielectric and propagates towards the cathode at ∼3 × 105 m s-1. The wavefront appears as a result of successive avalanches of electrons that propagate across the discharge gap after release from the cathode dielectric. During breakdown, the mean electron energy in the bulk plasma is close to optimum for preferential excitation of the Xe* 1s4,5 states that feed the VUV emitting Xe*2 excimer states. Calculations suggest that the overall conversion efficiency from electrical energy to VUV output in the plasma is greater than 60{\%}, with >99{\%} of the light output emitted in the VUV. Parasitic processes that act to reduce the key Xe* 1s4,5 and Xe*2 populations are found to be essentially negligible. For pulsed excitation, the longer-term spatio-temporal behaviour of the electron/ions during the afterglow or inter-pulse period is important, resulting in a remnant 'pre-pulse' ion density of ∼ 1015 -3 close to the cathode dielectric. These ions bombard the cathode during the subsequent excitation period to release the secondary (seed) electrons required to achieve electrical breakdown.",
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Computer modelling of a short-pulse excited dielectric barrier discharge xenon excimer lamp (λ ∼ 172 nm). / Carman, R. J.; Mildren, R. P.

In: Journal of Physics D: Applied Physics, Vol. 36, No. 1, 07.01.2003, p. 19-33.

Research output: Contribution to journalArticleResearchpeer-review

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