Massive conductor impedance and peculiarities of transients in electrical circuits with massive conductors of pulsed power facilities
At a small skin depth the electromagnetic field in conductors can be defined by the boundary layer method. The derived asymptotic solution makes it possible to determine the expansion in a series of the voltage drop across massive conductors. In this expansion the first term describes the limiting solution with infinite conductivity and corresponds to self-induction electro-motive force (EMF) of the external magnetic field or voltage drop across external inductance of massive conductors. Asymptotic correction of the first-order approximation corresponds to the fraction of the voltage drop calculated under the impedance boundary conditions on the surface of the conductors. The second-order correction takes into account the curvature of the conductor surface and inhomogeneity of the external magnetic field and varies in time directly as does current in the conductors, i.e. as in the case with voltage drop across a usual resistor. Such approximation establishes the relation between current and voltage drop on massive conductors, which can be included into the Kirchhoff’s equations for analysis and calculation of the transients in the circuits with massive conductors. The purpose of the paper is consideration of the peculiarities of the transients in electrical circuits, the methods of measurement of the massive conductor parameters, as well as the methods of the transients calculations in the time domain, which use the asymptotic representation of the voltage drop on massive conductors.
The installation for pulse compression with use of the heavy current pulse discharge
The pressure, arising at passage of the large pulse current through the cylindrical liner, can be used for creation of super-high pressure and pulse compression of specimens. Such pressure is necessary for various physical research, for study of phase conversions of substances. The installation for creation of the pulse pressure in the z-pinch scheme is described in the paper. The installation is connected to the terminal of the E7-25 Capacitive Energy Store and it is designed for 10 MA current pulse with 20 kV voltage. The first test results of the installation are submitted.
About the possibility of high pulse currents application in the experiments on dynamic compression of solid bodies
A pulsed power-based compression method of a steel cylindrical ampoule, installed inside a cylindrical liner constructed from metal with high electric conductivity (copper, aluminum) is analyzed. Compression efforts are created due to the pinch-effect in the process of high pulse current flow along the liner. Parameters of the investigated samples and the pulse current, required to obtain high pulse pressure, are determined.