Influence of atmospheric ions on impulse corona discharge

Abstract
The investigation was an attempt to control the primary ionisation in a gap to be subjected to an impulse potential. The technique consisted of the application of a steady potential to a rod electrode prior to the impulse wave. The initial population of ions will then be controlled by a drift process. If a negative-polarity drift field is applied to the rod, the time lag of the impulse corona discharge can be considerably delayed. The effect of a positive-polarity drift field is to shorten the time lag of the corona discharge. This polarity effect confirms the importance of negative ions as a source of primary electrons.The influence of electrode surface state and of the magnitude of the impulse voltage suggests that other sources of primary electrons may also exist.A quantitative analysis of the effect of a drift field on the ion density is also presented.

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