Abstract
A multichannel photoelectron technique is used to study the X-ray radiation emitted from a nanosecond diffuse discharge initiated in atmospheric pressure air in a point-plane electrode system with a gap width varying from 6 to 12 cm. The discharge is initiated by a voltage pulse with a moderate rate of rise of 1.1 × 1013 V/s and an amplitude of 160–280 kV. The radiation detected is found to be anisotropic bremsstrahlung of electrons accelerated to 30–80 keV in the near-cathode region early at the conduction phase. The observed features of the radiation and electrical behavior of the discharge are explained by strengthening of the near-cathode field owing to a short-term disappearance of the space-charge-related screening when the discharge passes from the bridging phase to the conduction one.
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