Study on the energy deposition in fast electrical explosion of single aluminum wire in vacuum

The fast electrical explosion of a single metal wire has important applications in m plasma and the voltage collapse, is very important to subsequent evolvement of the core-corona structure. In this paper, the energy deposition in the initial stage of the electrical explosion of Aluminum (Al) wire, which is widely used in relevant research and applications, is investigated experimentally. Experiments are conducted in vacuum (~10^-2 Pa) chamber. The pulse current with magnitude of ~1kA and rising rate of 80-170A/ns is generated by a capacitor bank with charging voltage up to 40kV. The deposited energy is calculated by integrating the products of resistive voltage and current before voltage collapse. The influence of current rising rate on energy deposition is investigated. The experimental result of energy deposition is also compared with the simulation result of a one-dimensional MHD model, which is developed to investigate the explosion process of metal wire.