Thomson scattering diagnostics of decay processes of Ar/SF6 gas-blast arcs confined by a nozzle

Kentaro Tomita, Daisuke Gojima, Kazuhiko Nagai, Kiichiro Uchino, Ryo Kamimae, Yasunori Tanaka, Katsumi Suzuki, Takanori Iijima, Toshiyuki Uchii, Takeshi Shinkai

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36 Citations (Scopus)


Because of its instability, it is difficult to measure precisely the electron density (ne) of a long-gap decaying arc discharge in a circuit breaker. However, it is well known that it is an essential parameter for the determination of success or failure of the current interruption in a circuit breaker. In this paper, the spatiotemporal evolutions of the electron density were successfully measured in decaying SF6 gas-blast arc discharges formed with a long gap (50 mm) in a confined nozzle using laser Thomson scattering. Pure Ar gas and an 80%Ar/20%SF6 mixture gas were used as the arc quenching media at atmospheric pressure. After reducing the current to zero, both the measured ne and arc radius in the Ar/SF6 gas arc clearly decayed more rapidly than in the pure Ar gas arc.

Original languageEnglish
Article number382001
JournalJournal of Physics D: Applied Physics
Issue number38
Publication statusPublished - Sept 25 2013

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films


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