or long-time followers of fusion energy, Tokamak Hall is the high-water mark after decades of ups and downs. From an observation deck on the side, the surgically-clean, hospital-white room feels both like a cathedral and yet somehow too tiny for its lofty purpose. Commonwealth Fusion Systems, the company building it, says the room will soon hold a tokamak, the central donut-shaped device necessary for one approach to nuclear fusion. In the tokamak, scientists will heat up deuterium and tritium to 100 million degrees Celsius and fuse them together—producing heat that can be converted to electricity in the process.
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