Diagnostics of atmospheric-pressure pulsed-dc discharge with metal and liquid anodes by multiple laser-aided methods

Keiichiro Urabe, Naoki Shirai, Kentaro Tomita, Tsuyoshi Akiyama, Tomoyuki Murakami

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The density and temperature of electrons and key heavy particles were measured in an atmospheric-pressure pulsed-dc helium discharge plasma with a nitrogen molecular impurity generated using system with a liquid or metal anode and a metal cathode. To obtain these parameters, we conducted experiments using several laser-aided methods: Thomson scattering spectroscopy to obtain the spatial profiles of electron density and temperature, Raman scattering spectroscopy to obtain the neutral molecular nitrogen rotational temperature, phase-modulated dispersion interferometry to determine the temporal variation of the electron density, and time-resolved laser absorption spectroscopy to analyze the temporal variation of the helium metastable atom density. The electron density and temperature measured by Thomson scattering varied from 2.4 1014 cm-3 and 1.8 eV at the center of the discharge to 0.8 1014 cm-3 and 1.5 eV near the outer edge of the plasma in the case of the metal anode, respectively. The electron density obtained with the liquid anode was approximately 20% smaller than that obtained with the metal anode, while the electron temperature was not significantly affected by the anode material. The molecular nitrogen rotational temperatures were 1200 K with the metal anode and 1650 K with the liquid anode at the outer edge of the plasma column. The density of helium metastable atoms decreased by a factor of two when using the liquid anode.

Original languageEnglish
Article number045004
JournalPlasma Sources Science and Technology
Volume25
Issue number4
DOIs
Publication statusPublished - May 26 2016

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atmospheric pressure
anodes
liquids
metals
lasers
metastable atoms
Thomson scattering
helium atoms
electron energy
nitrogen
laser spectroscopy
plasma jets
spectroscopy
temperature
absorption spectroscopy
interferometry
cathodes
helium
Raman spectra
impurities

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Diagnostics of atmospheric-pressure pulsed-dc discharge with metal and liquid anodes by multiple laser-aided methods. / Urabe, Keiichiro; Shirai, Naoki; Tomita, Kentaro; Akiyama, Tsuyoshi; Murakami, Tomoyuki.

In: Plasma Sources Science and Technology, Vol. 25, No. 4, 045004, 26.05.2016.

Research output: Contribution to journalArticle

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AU - Murakami, Tomoyuki

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