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Article

Observations of X-rays from laboratory sparks in air at atmospheric pressure under negative switching impulse voltages

Atmosphere, Switzerland. 2019. Vol. 10. No. 4.
Rakov V., Rahman M., Cooray V.

We present observations of X-rays from laboratory sparks created in the air at atmospheric pressure by applying an impulse voltage with long (250 mu s) rise-time. X-ray production in 35 and 46 cm gaps for three different electrode configurations was studied. The results demonstrate, for the first time, the production of X-rays in gaps subjected to switching impulses. The low rate of rise of the voltage in switching impulses does not significantly reduce the production of X-rays. Additionally, the timing of the X-ray occurrence suggests the possibility that the mechanism of X-ray production by sparks is related to the collision of streamers of opposite polarity.