DIII-D National Fusion Facility

The largest US tokamak — a flexible workhorse for fusion plasma physics serving the US fusion program and ITER.

DIII-D at General Atomics in San Diego is the US flagship tokamak. Its flexible diagnostics and heating systems make it the world's most-used tokamak for plasma-physics experiments, with hundreds of researchers per year and over 30,000 discharges.

Key specifications

Major radius

1.67 m

Magnetic field

2.2 T

Plasma current

3 MA

Milestones

1. 1986

   First plasma

2. Ongoing

   ~1,500 plasma discharges per year