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ITER site, May 2020. Photo: ITER Organization

The US is among seven partner nations in ITER, an unprecedented international collaboration of scientists and engineers working to design, construct, and assemble a reactor-scale burning plasma experiment that can demonstrate the scientific and technological feasibility of fusion power. 

US ITER is a DOE Office of Science project managed by Oak Ridge National Laboratory. Partner labs are Princeton Plasma Physics Laboratory and Savannah River National Laboratory.

US ITER website