 , the Wendelstein 7-X reactor is the largest stellarator device.It has been anticipated to achieve operations of up to approximately 30 minutes of continuous plasma discharge in 2021, thus demonstrating an essential feature of a future fusion power plant — continuous operation.The name of the project, referring to the mountain Wendelstein in Bavaria, was decided at the end of the 1950s, referencing the preceding project from Princeton University under the name Project Matterhorn.