Japan · Magnetic confinement (stellarator/heliotron)
Large Helical Device
Operated by National Institute for Fusion Science · First operation 1998
Status: Operational
Japan's superconducting heliotron — for decades the largest stellarator-class device, pioneering steady-state magnetic confinement.
LHD at Toki, Japan uses two continuous helical coils rather than the modular coils of W7-X. It pioneered superconducting steady-state operation and high-density plasma research.
Key specifications
- Major radius
- 3.9 m
- Magnetic field
- 3 T
- Plasma volume
- 30 m³
Milestones
1998
First plasma
2017
Deuterium experiments begin