Short-pulse breakdown of near-cathode sheath in the presence of a local magnetic field

Thin Luminous Tracks of Particles from Electrodes with a Small Radius of Curvature in Pulsed Nanosecond Discharges in Air and Argon

“…In this case, the amplification of the electric field due to the shape of the electrodes and the formation of a dense plasma via a thermal explosion of microprotrusions affect the TLT occurrence. A similar phenomenon is observed in vacuum discharges due to explosive electron emission [31][32][33][34]. TLTs in diffuse discharges in air, argon and, apparently, in other gases, are in contact with both electrodes in contrast to the vacuum discharges…”

“…There are pulses in which a large number of TLTs are in contact with one bright spot, and some of TLTs are in contact with the electrode at the periphery of the bright spots. It can be assumed that the appearance of TSCs in our experiments is associated with an increase in the electric field near electrodes with a small radius of curvature, and the appearance of a dense plasma near the electrodes as in vacuum discharges, see [31][32][33][34]. This leads to the departure of micro-and nanoparticles of metal from the electrode surface under the influence of mechanical stresses.…”

“…Initial plasma is created due to heating and thermal explosion of micro-inhomogeneities through which a current with a high density flows [27]. As was shown in [31][32][33][34], a decrease in the breakdown voltage in a vacuum cannot be associated only with explosive electron emission from the cathode. Various phenomena must be considered to understand the limitations of the electrical strength of vacuum insulation.…”

Thin Luminous Tracks of Particles Released from Electrodes with A Small Radius of Curvature in Pulsed Nanosecond Discharges in Air and Argon

“…Therefore, the TLT color differs from that of the spark leader Initial plasma is formed due to heating and thermal explosion of micro-inhomogeneitie through which a current with a high-density flows [27]. As was shown in [33][34][35][36], a d crease in the breakdown voltage in a vacuum cannot be associated only with explosiv electron emission from the cathode. Various phenomena must be considered to unde stand the limitations of the electrical strength of vacuum insulation.…”

“…There are pulses in which a large number of TLTs are in contact with one bright spot, and some of the TLTs are in contact with the electrode at the periphery of the bright spots. It can be assumed that the appearance of TLTs in our experiments is associated with an increase in the electric field near electrodes with a small radius of curvature, and the appearance of a dense plasma near the electrodes as in vacuum discharges (see, e.g., [33][34][35][36]). This leads to the departure of micro-and nanoparticles of metal from the electrode surface under the influence of mechanical stresses.…”