Large Helical Device

The Large Helical Device is a fusion research facility in Toki that uses a superconducting stellarator design to confine and study superheated plasma. The machine features powerful magnetic coils arranged in a spiral pattern to contain the extremely hot gas needed for fusion reactions.

The project began in 1990 and started operating in 1998, positioning Japan as a leader in fusion research technology. This facility helped advance stellarator research as a serious alternative method for studying nuclear fusion around the world.

Scientists and researchers from multiple countries collaborate at this facility to study plasma confinement methods and advance global fusion energy research.

The site is open to visitors but advance registration is needed since it operates as an active research center. Tours guide you through the main areas and explain how the equipment works in straightforward terms.

The helical design is less familiar than other fusion approaches but follows a completely different strategy for containing plasma. This arrangement allows for longer operating periods and provides insights that complement tokamak experiments happening elsewhere.

Location: Toki

GPS coordinates: 35.32611,137.16861

Latest update: December 10, 2025 15:52