Physics of exploding wire in vacuum

Important results of initial stage of nanosecond exploding wire in vacuum are presented. Polarity effect and current rate effect are responsible for homogeneity of energy deposition into wire core before breakdown and later after breakdown axial ablation symmetry of the wire. It was shown experimentally that symmetry of plasma cylinder as well as final X-ray yield affected by initiation phase of exploding wires during current prepulse. Atomization enthalpy of metal significantly effects property of electrical explosion of wires. Experimental results based on set of electrical, laser probing and spectroscopic diagnostics. Magneto hydro dynamic simulation successfully reproduced main feature of the fast and hot electrical explosion. A thermodynamic calculation demonstrates.