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Fusion, the nuclear reaction that powers the Sun and the stars, is a promising long-term option for a sustainable, non-carbon emitting global energy supply. Harnessing fusion's power is the goal of ITER, which has been designed as the key experimental step between today's fusion research machines and tomorrow's fusion power plants.


One million components, ten million parts ... the ITER Tokamak will be the largest and most powerful fusion device in the world. The primary objective of ITER is to experimentally attain a "burning" plasma, in which the self-heating of the plasma by nuclear fusion reactions dominates all other forms of heating.

Visualization courtesy of Jamison Daniel / Oak Ridge Leadership Computing Facility

35 countries, 35 years

ITER Members China, the European Union (through Euratom), India, Japan, Korea, Russia and the United States are collaborating over the long term to build and operate the ITER device. The Members are sharing all generated intellectual property, now during the Construction Phase and later during operation.


The ITER scientific installation is taking shape, as buildings rise and machine and plant components are delivered from factories on three continents to the ITER site in southern France. Thousands of workers are participating in construction, assembly and installation activities.

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