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Shack–Hartmann type laser wavefront sensors were developed for measuring a two-dimensional electron density distribution over an arc channel in an extinguishing phase by only a single measurement with high temporal and spatial resolutions. The sensors were applied to pulsed arcs in a 3 mm air gap between rod-to-rod tungsten electrodes with a diameter of 1mm. Electron densities in the arc discharges with currents of several tens of amperes were 2 × 1023 m−3 around the gap centre, which were more than twice lower than those near the anode and cathode.

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