Negative corona ‘tufts’

Abstract

Although the formation of bright spots ('tufts', 'beads') by negative wire corona is known, images of this phenomenon are not available in the literature. The images presented in this paper show that there are mechanisms that result in the formation of regular structures from negative corona 'tufts'. Though 'tufts' of different intensity can co-exist, they 'prefer' neighbors of the same intensity. When the current density per unit of wire length is high, the 'tufts' 'repel' each other, and the brighter these 'tufts' are, the stronger this 'repulsion'.

Multiple solutions in the theory of dc glow discharges and cathodic part of arc discharges. Application of these solutions to the modeling of cathode spots and patterns: a review

“…Negative corona discharges in electron-attaching gases can occur in the form of multiple discrete points, or 'tufts'; e.g. figure 10 and its discussion in section 5.1 and references [147, p 329], [148,149]. The average current of a tuft corona is steady, but is composed of tiny pulses.…”

Computational and Experimental Study of Time-Averaged Characteristics of Positive and Negative DC Corona Discharges in Point-Plane Gaps in Atmospheric Air

“…For example, the rod length is a parameter omitted in experimental publications on corona discharges in the rod-to-plane configuration; e.g., works [22], [23] and their discussion in [13]. As another example, one can mention wire coronas: they are very sensitive to the environment (see [24]), meaning that the electrostatic boundary conditions are not well defined.…”

Atmospheric Pressure Plasma Generation System Based on Pulsed Volume Discharge for the Biological Decontamination of a Surface

“…Making a comparison to the abnormal glow discharge will explain the emergence of local areas of cathode surface with more intensive emission. By increasing the current in the glow discharge the area of cathode surface increases [19]. By further increasing the current and it is no longer possible to increase vol.…”