Alcator C-Mod

Alcator C-Mod is a tokamak, a magnetically confined nuclear fusion device, at the MIT Plasma Science and Fusion Center. It is the tokamak with the highest magnetic field and highest plasma pressure in the world. It is one of the major fusion research facilities in the United States, together with DIII-D at General Atomics and NSTX at Princeton Plasma Physics Laboratory.

Operating since 1991, it is the third of the Alcator (Alto Campo Toro, High Field Torus) tokamak series, following Alcator A (1973–1979) and Alcator C (1978–1987). This reactor represents the largest fusion reactor operated by any university and is an integral part of the larger Plasma Science and Fusion Center (PSFC).