Experiments were carried out to investigate the breakdown characteristics of SF
6 gas at 3 atm between needle plane electrodes with a small gap of 1.2_??_2mm. The voltage-time characteristics of the corona and breakdown in SF
6 gas were measured using μs pulse voltage of various wave fronts. Although the corona onset voltage decreased with increasing wave front, the breakdown voltage reached a maximum value as the wave front increased, and reduced at still longer wave fronts. The shape of
V-t characteristics was, thus, different from that usually seen with a uniform field gap. A polarity effect was also seen on the breakdown characteristics. These anomalous breakdown characteristics are discussed together with the results of the corona properties observed with an image intensifier tube.
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