Current Instability and Disruption of Shaped-Charge Jets

摘要

The idea of electromagnetic action on a shaped-charge jet (SCJ) has a relatively long history. The first experiments familiar to the authors were performed under the guidance of M. A. Lavrentyev as early as 1957 1. In these experiments, small shaped charges (SC) of caliber 25 mm were used. A capacitor bank with a voltage of up to 50 kV was used as the electromagnetic energy source. The problem has not been studied in detail, but these experiments showed that a SCJ can be destroyed by passage of a high electric current through it, which leads to a decrease in the penetration depth. At the end of the 1970s, comprehensive studies of the stability of SCJ with passage of an axial electric current through them were began at the Institute of Hydrodynamics 2+4. The experiments have shown that SCJ are unstable in the magnetic field of an axial current. The instability detected in the experiments was called 'current instability of shaped-charged jets' 3. Later other teams of scientists began to work in this line. At present, a great number of works concerned with this physical phenomenon have been published. A review of the main publications of authors from Russia (Soviet Union) is given in this report.