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More than 200 tokamaks around the world have paved the way to the ITER experiment.

Conceived as the last experimental step to prove the feasibility of fusion as a large-scale and carbon-free source of energy, ITER will be the world's largest tokamak, with ten times the plasma volume of the largest tokamak operating today.

A consortium of nations—China, the 27 states of the European Union, India, Japan, Korea, Russia and the United States—is building ITER collaboratively, in an ambitious wager to advance fusion science and technology to the point where demonstration fusion power plants can be designed.

Construction is underway now in Saint-Paul-lez-Durance, France.