The bundle of magnets at the heart of the U.S. Department of Energy’s Princeton Plasma Physics Laboratory’s (PPPL) National Spherical Torus Experiment-Upgrade (NSTX-U) is the star of the show.

Its magnets will produce the highest magnetic field of any large spherical torus, allowing for near steady-state conditions. They are critical to the design of NSTX-U. When it begins operating, it will be essential in determining whether spherical tokamaks, which are smaller and more compact than traditional doughnut-shaped tokamaks, could provide a more efficient and cost-effective model for a fusion pilot plant.

The 19-foot toroidal field (TF) magnet carries up to 4 million amps of electric current to stabilize and confine the superhot plasma in fusion experiments. It will eventually connect to 12 TF coils on the outside of the vacuum vessel. Wrapped around it like a slinky is the ohmic heating (OH) coil, a 4-kilovolt magnet that induces an electric field, which drives an electric current into the vessel and helps to heat the plasma.

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Previous measures meant all exporters faced lengthy approval processes.