Overcoming plasma instabilities via sheared-flow stabilized Z-pinches

The Z-pinch confinement approach offers a radically simplified reactor geometry by entirely eliminating the need for massive external magnetic coils. Instead, an electrical current is driven directly through a plasma filament, creating an azimuthal magnetic field that compresses the plasma to fusion conditions.

To solve the rapid magnetohydrodynamic instabilities that historically plagued Z-pinches, Zap Energy employs a sheared-flow stabilization technique pioneered at the University of Washington. Velocity gradients across the plasma column suppress the kink and sausage modes that destroyed earlier devices on microsecond timescales.

Operating their FuZE-3 device with a novel third electrode to separate acceleration and compression forces, Zap recently recorded extreme electron pressures of 830 megapascals (1.6 gigapascals total macroscopic pressure), effectively placing the sheared-flow Z-pinch on a viable path toward scientific energy gain.