The effect of photoemission on nanosecond helium microdischarges at atmospheric pressure

Z. Donkó, Satoshi Hamaguchi, Timo Gans

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Atmospheric-pressure microdischarges excited by nanosecond high-voltage pulses are investigated in helium-nitrogen mixtures by first-principles particle-based simulations, which include VUV resonance radiation transport via the tracing of photon trajectories. The VUV photons, of which the frequency redistribution in the emission processes is included in some detail, are found to modify the computed discharge characteristics remarkably, due to their ability to induce electron emission from the cathode surface. Electrons created this way enhance the plasma density, and a significant increase of the transient current pulse amplitude is observed. The simulations allow the computation of the density of helium atoms in the 21P resonant state, as well as the density of photons in the plasma and the line shape of the resonant VUV radiation reaching the electrodes. These indicate the presence of significant radiation trapping in the plasma and photon escape times longer than the duration of the excitation pulses are found.

Original languageEnglish
Article number054001
JournalPlasma Sources Science and Technology
Volume27
Issue number5
DOIs
Publication statusPublished - May 29 2018

Fingerprint

atmospheric pressure
photoelectric emission
helium
photons
radiation trapping
radiation transport
helium atoms
resonance fluorescence
pulse amplitude
tracing
pulses
electron emission
plasma density
escape
line shape
high voltages
simulation
cathodes
trajectories
nitrogen

Keywords

  • microdischarge
  • photoemission
  • PIC simulation

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

The effect of photoemission on nanosecond helium microdischarges at atmospheric pressure. / Donkó, Z.; Hamaguchi, Satoshi; Gans, Timo.

In: Plasma Sources Science and Technology, Vol. 27, No. 5, 054001, 29.05.2018.

Research output: Contribution to journalArticle

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