20 T portable bipolar magnetic pulser

Wolf Cruz, R. R.; Dias, A. L. B.; Bonfim, M. J. C.
June 2010
Review of Scientific Instruments;Jun2010, Vol. 81 Issue 6, p064705
Academic Journal
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 μs 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.


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