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Reillumination of submicrosecond pulsed corona-like discharges in water
Plasma Sources Science and Technology ( IF 4.128 ) Pub Date : 2019-12-10 , DOI: 10.1088/1361-6595/ab54e0
Raphael Rataj, Hans Höft and Juergen F Kolb

Pronounced reilluminations can be observed for discharges that are generated in water by submicrosecond high-voltage pulses. This phenomenon can appear during the decrease of the applied voltage, depending on the pulse characteristics, especially fall times. The respective processes are expected to be crucial for optical investigations of discharge characteristics and also for applications. Accordingly, the development of individual corona-like discharges in water was investigated in a needle-to-plate geometry for their ignition by single rectangular high-voltage pulses with a duration of 100 ns. The pulse amplitudes of about 50 kV and adjusted pulse fall times of 20, 26, and 43 ns were used. Voltages, currents and light emissions were synchronized with subsequent images of individual discharge events. Two distinct stages, a propagation phase and a reillumination phase, were identified. The individual discharges expanded for all investigated fall times with the same velocity of ...
更新日期:2019-12-11

 

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