Functional nuclear fusion machine: Wendelstein 7-X, Will science be able to reach infinite energy?
The Wendelstein 7-X reactor is an experimental stellarator nuclear fusion reactor built in Greifswald, Germany, by the Max Planck Institute of PlasmaPhysics, and completed in October 2015. It is a further development of Wendelstein 7-AS. The purpose of Wendelstein 7-X is to evaluate the main components of a future fusion reactor built using stellarator technology, although Wendelstein 7-X itself is not an economical fusion power plant.
Well, calling it 'functional nuclear fusion machine' is a bit exaggerated. It is so far only a promising alternative to the Tokamak.