Fusion Approach
Experimental Results
PublicationDensity (m-3)Temperature (keV)Energy Confinement Time (s)Triple Product (m-3 keV s)
Experiments on the ST Tok...
 6×1019(electron)0.8(electron) 0.4(ion)1×10-22.4×1017
Publications Describing Device

Experiments on the ST Tokamak

Princeton's Symmetrical Tokamak from Proposal to Plasma in 8 Months


Symmetric Tokamak (ST) was the first tokamak in the US, designed and built at PPPL. The origin of the design of ST was the Model C stellarator. After results in T-3 revealed that heating was more successful in tokamaks than in early stellarators, the team at PPPL decided to change the stellarator configuration to a tokamak configuration. The transformation required changes in the vacuum vessel geometry, changing from racetrack to a circular configuration. The magnetic coils were designed to produce magnetic fields between 3.5 and 4.5 T. After 5 months of extensive transformation, the ST finally started operations on May 1st, 1970. The ST quickly achieved similar results to T-3, which led to the end of the stellarator era at that time. ST achieved electron temperatures of 2.2 keV.

Affiliated Organizations
In Operation

1970 - 1974