~9% for 100% of ITER technology and science
The US is a partner nation in ITER, an unprecedented international collaboration of scientists and engineers working to design, construct, and assemble a burning plasma experiment that can demonstrate the scientific and technological feasibility of fusion. ITER’s other partners are the People’s Republic of China, the European Union, India, Japan, the Republic of Korea, and the Russian Federation.
US ITER is a DOE Office of Science project managed by Oak Ridge National Laboratory in Tennessee. Partner labs are Princeton Plasma Physics Laboratory and Savannah River National Laboratory. Involvement in ITER provides significant benefits for the US for a limited investment (~9% of construction costs): The US has access to all ITER technology and scientific data, the right to propose/conduct experiments, and the opportunity for US universities, laboratories and industries to design and construct parts. The US contributes procurement of hardware, assignment of personnel, and cash contributions for the US share of common expenses such as personnel infrastructure, assembly, and installation.
For more information on the history of ITER, see: