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.
Megagauss magnetic field generation in single-turn coils: new frontiers for scientific experiments
We report on the design and performance of a megagauss generator at the Humboldt High Magnetic Field Centre. The installation uses the fast capacitor discharge into single-turn coils to produce microsecond pulses of 260 T in 8 mm diameter suitable for low-temperature experiments and 310 T in 5 mm diameter. Simple concepts are applied to substantiate crucial design principles for the generator and the choice of components. The implementation of a high-power/low-inductance circuit operated at 60 kV and other technical questions are discussed in detail. The analysis of experimental field and current data is based on numerical simulations of the magnetic pressure and the nonlinear flux diffusion. It was carried out in order to investigate the limitations and characteristics of the Berlin generator in particular and the single-turn coil technique in general. The paper focuses primarily on field, generator and coil parameters, which can be used for performing routine, reproducible scientific experiments at low temperatures.
The generation and application of megagauss fields at the Humboldt High Magnetic Field Center
Abstract A new multi-megagauss generator has been constructed which produces 239 and 311 T with a pulse duration of 5 μs in single turn coils with an inner diameter of 10 and 5 mm, respectively. Prominent features of the installation are the vertical coil orientation, a stripline-based lightweight/low inductance discharge circuit in modular arrangement and the galvanic separation of control panels and high-voltage units. The installation is designed as a scientific instrument including suitable cryostats, fast data acquisition systems and basic setups for spectroscopical investigations. The design and performance of the field generator as well as the supplementary equipment are discussed and demonstrated in connection with cyclotron resonance measurements at temperatures down to 5 K.