Finite Element Analysis of Magnetic Field Single-Turn Systems
Modelling of pulsed magnetic systems has extensive application in the optimisation of electromagnetic metal forming as well as in pulsed ultrahigh field generation systems. This paper presents a detailed three-dimensional finite element analysis model to be used in such power systems and compares simulated solutions with accurate experimental data.
A fast and compact θ-pinch electromagnetic flux-compression generator
Ultrahigh magnetic fields up to 300 T (3 MG) have been generated by electromagnetic flux compression using only 63 kJ from a fast capacitor bank to implode aluminium liners, with 14.7 kJ from a slow capacitor bank needed to provide an initial magnetic field. With no initial field present, pulses of magnetic flux density having a time rate-of-change exceeding 3 × 108 T s−1 have been produced and measured, opening the way for a range of dynamic transformer applications. The outcome of the work suggests that, when using fast multi-MA banks, flux compression can be viewed as an alternative to the single-turn coil technique that will move the boundary of the magnetic fields well beyond 300 T without the need for significant additional investments.
Megagauss fields in single turn coils
Magnetic fields in the range 100-200 T are generated in lightweight coils with an inner diameter between 2.5 and 10 mm. The rise time to peak field is 2 mu s. Special design features of the 20 kV, 55 kJ capacitor bank facilitate the application to experiments. Thin-walled coils made of dense, ductile material give superior performance in this field range.