title: 20 T portable bipolar magnetic pulser.
abstract: High magnetic fields are required for the study of hard magnetic materials and, in many cases, the reversal of these fields is essential. This paper describes a portable pulse generator capable of producing bipolar magnetic fields up to 20 T into a copper coil. The peak current around 7 kA is achieved by discharging two capacitor banks through a combination of thyristors and fast diodes. Each pulse polarity has a semisinusoidal shape with 18 mus base width. Pulse triggering is computer controlled and magnetic measurements are done by an induction coil or Kerr effect acquired by a sampling oscilloscope. The whole apparatus weighs less than 2 kg. Hysteresis loops of NdFeB magnets were done to demonstrate the viability of the system.
authors.affiliation: Departamento de Engenharia Elétrica, Universidade Federal do Paraná, Curitiba, Paraná 81530-990, Brazil.
authors.forename: R R
authors.initials: RR
authors.lastname: Wolf Cruz
authors.forename: A L B
authors.initials: AL
authors.lastname: Dias
authors.forename: M J C
authors.initials: MJ
authors.lastname: Bonfim