Uchino Kiichiro

Tuesday 8
A. Arcs
Chair: J. Yan - Each talk is 10'+2' duration
› 15:45 - 16:00 (15min)
› Cabannes
Optical diagnostics of decay processes of Ar/SF6 gas blast arcs confined by a nozzle
Kentaro Tomita  1, *@  , Daisuke Gojima  1  , Kazuhiko Nagai  1  , Takahiro Shimizu  1  , Kiichiro Uchino  1  , Yasunori Tanaka  2  , Katsumi Suzuki  3  , Takanori Iijima  4  , Toshiyuki Uchii  4  , Takeshi Shinkai  4  
1 : Kyushu University
2 : Kanazawa University
3 : Tokyo Denki university
4 : Toshiba corporation
* : Corresponding author

 Spatiotemporal evolutions of the electron density (ne) were 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.


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