Supply

Power converters and their associated controllers were recently installed at NHMFL Pulsed Field Facility at Los Alamos National Laboratory to energize the quasi-continuous magnet, which will produce a 60 T flat-top pulse for 100 ms from five 64 MW converters. The liquid nitrogen cooled magnet, which will be the most powerful of its class in the world and the first of its kind in the United States, consists of nine concentric coils that are grouped electrically into three independent sections, as shown in Figure 1. The converters receive power from the 1430 MVA / 600 MJ inertial energy storage generator.1 Three of the five converters have been installed and individually tested at rated power and energy with an ohmic-inductive load. The remaining two will be ready by May, along with two “extra” converters for the world’s first non-destructive 100 T magnet, to be completed later. Power Supply Design Each power converter is supplied with 21 kV from the 1430 MVA / 600 MJ energy storage generator.2 At the synchronous speed (1800 rpm), 1260 MJ are stored in the generator rotor and shaft train. The generator can release up to half of this energy during LANL cont. on page 15 13.4 kV Fee