Departmental Bulletin Paper Measurement of Electron Density and Electron Temperature in Decaying Arcs Containing Decomposed Gas from Polymer

Safwat, Hassaballa  ,  Tomita, Kentaro

37 ( 2 )  , pp.6 - 11 , 2016-02 , 九州大学大学院総合理工学府
Electron density (ne) and electron temperature (Te) in arc discharges generated in the atmospheric air were measured using the laser Thomson scattering (LTS) technique. The arcs were generated using tungsten electrodes with a gap length of 2 mm. At the tip of the cathode electrode, a polymer material-polyoxymethylene (POM) or polytetrafluoroethylene (PTFE)-was inserted to generate the arcs containing the decomposed gas from polymer. LTS results showed that n_e in the arcs varied with the polymer material used. In particular, with POM, the decay speed of n_e was much higher than that with PTFE. The LTS results are qualitatively consistent with the results of previous numerical studies, which indicate that a POM ablation gas can decay the arc conductance more effectively than a PTFE ablation gas.

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