Analysis of the discharge channel structure upon nanosecond electrical explosion of wires

Abstract

The structure of the discharge channel during nanosecond wire explosions has been studied using laser probing. Wires of 25μm diameter and 12mm length were exploded in air and vacuum by 10kA current pulse having a 50A∕ns rate of rise. Upon electrical explosion of thin wires in the air, the development of shock waves was observed. The propagation of shock waves was analyzed, and it was possible to draw conclusions on the location of the flow of most of the current in the volume of the discharge channel. This permitted distinguishing between two scenarios (shunting and internal) of the interelectrode gap breakdown development. The scenario depends to a large extent on the properties of the exploding wire material. The same two scenarios are valid upon electrical explosion of wire in vacuum. Moreover, if secondary breakdown develops in the internal scenario, the value of the energy deposition in the wire material during explosion in vacuum may be comparable with that found during explosion in air.

Temporal shock wave analysis produced by copper exploding wires in air at atmospheric pressure

“…Different plasma characteristics are visible on the features of the recorded light including the shock wave and the plasma channel. 16,17 We present here the measures of the exterior front radii as a function of time that include the expansion plasma and the shock wave stages. One of the most visible features is the reduction of the light absorption region at the beginning of the plasma expansion when the initial charging voltage increases its magnitude; 6 also, an increase in the rate of the radii of the shock wave is visible.…”

“…Because the shock wave generated has rich information about the shock wave generator system, different wire materials, dimensions, and surrounding media were studied in the past. [14][15][16][17][18] Here, we focus the study on a copper exploding wire at atmospheric pressure. The diameter of wire and charged voltage of the electrical system are used simultaneously as parameters in these experiments.…”

Effect of configuration and dimensions of reactor electrodes on electrical and optical corona discharge characteristics

“…15 The structure of the discharge channel during nanosecond wire explosions has been studied using laser probing. 16 Wires of 25 m diameter and 12 mm length were exploded in air and vacuum by 10 kA current pulse having a 50 A/ns rate of rise. Upon electrical explosion of thin wires in the air, the development of shock waves was observed.…”

Microstructure of Ti-Cr Nanoparticles Prepared by Electrical Wire Explosion

“…8) Significant variation in the composition distribution of atoms in the final products of intermetallic compounds has been reported in previous studies. [2][3][4] However, there are few reports on the chemical composition and microstructures of single alloy particles.…”