Electron density change of atmospheric-pressure plasmas in helium flow depending on the oxygen/nitrogen ratio of the surrounding atmosphere

Kentaro Tomita, Keiichiro Urabe, Naoki Shirai, Yuta Sato, Safwat Hassaballa, Nima Bolouki, Munehiro Yoneda, Takahiro Shimizu, Kiichiro Uchino

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Laser Thomson scattering was applied to an atmospheric-pressure plasma produced in a helium (He) gas flow for measuring the spatial profiles of electron density (ne) and electron temperature (Te). Aside from the He core flow, the shielding gas flow of N2 or synthesized air (N2 : O2 = 4 : 1) surrounding the He flow was introduced to evaluate the effect of ambient gas components on the plasma parameters, eliminating the effect of ambient humidity. The ne at the discharge center was 2.7 ' 1021m%3 for plasma generated with N2/O2 shielding gas, 50% higher than that generated with N2 shielding.

Original languageEnglish
Article number66101
JournalJapanese Journal of Applied Physics
Issue number6
Publication statusPublished - Jun 2016


All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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