The Adiabatic Toroidal Compressor (ATC) was a tokamak built and operated at PPPL. It was made to determine the feasibility of increasing the temperature and density in a tokamak by compressing the plasma with an increasing magnetic field. ATC had 24 coils of 10 turns each with 115 cm of internal diameter and 145 cm of external diameter to produce the toroidal field. During its operation, the plasma current ramped from 90 kA to 241 kA after compression. Unlike conventional tokamaks, ATC did not have a metallic core. Instead, the core was substituted with ohmic heating windings.
1972 - 1976