An engineering diagram of the Alcator C-Mod tokamak showing the central portion of the machine without auxiliary systems. The toroidal plasma (pink) is inside the vacuum chamber (mustard) with many vacuum ports. Magnetic coils (green, purple) profile the magnetic field. A string superstructure (grey, light blue) surrounds the magnets. The entire assembly is encased in a liquid nitrogen cooled cryostat (light grey).