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Negative coronas: Low current mode – pulse mode transition |
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| Authors: | V Repän M Laan P Paris J Aarik V Sammelselg |
| Institution: | (1) Institute of Experimental Physics and Technology, University of Tartu, Tähe 4, EE2400 Tartu, Estonia;(2) Institute of Material Sciences, University of Tartu, Tähe 4, EE2400 Tartu, Estonia;(3) Institute of Physics, University of Tartu, Tähe 4, EE2400 Tartu, Estonia |
| Abstract: | In the paper the results of experimental study of negative corona in a point – plane gap in a dust-free air flow at atmospheric pressure are presented. Both the low current mode (LCM) of the discharge and Trichel pulses are externally triggered by UV light. Close to the inception voltage of Trichel pulses short-duration current spikes appear besides the steady component of the LCM which indicates to the switch-on of Fowler-Nordheim type emission mechanism. At the inception voltage spike – Trichel pulse transition is recorded. The influence of dielectric layers at the cathode on the discharge parameters is discussed. |
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