The Pulsed-Field Facility at HFML, Commissioning and First Results

Abstract

To provide a large range of magnetic field strengths to its users, the 20 MW DC installation of the Nijmegen High Field Magnet Laboratory (HFML) is complemented by a modular 2 MJ, 16 kV capacitor bank. In this contribution we report on the steps taken to commission the pulsed-field setup and on the first results obtained with magnetotransport experiments on GaAs/AlGaAs structures.Index Terms-Hall effect, pulsed magnets.

Powering Multi-Coil Systems Combining DC and Pulsed Power Supplies

“…2, crowbars connect the two terminals to ground (i.e. the current return path [2]) for positive and for negative voltage, and a crowbar thyristor diode is fired when overvoltage is detected.…”

“…In this paper we will focus on the developments more specific for HFML, where pulsed field magnets can be energized using either a 2 MJ, 16 kV capacitor bank [2] or a state-of-the-art 20 MW DC power supply in pulsed mode. Each of these sources is capable of delivering up to 20 kA, and the 20 MW power converter is well-suited to energize large outer coils to provide a long-pulse platform field (duration of the order of 1, 000 ms) for a short-pulse capacitor driven insert coil (duration of the order of 10 ms).…”