It’s a newly proposed fusion reactor prototype. It’s a stellerator type reactor. Together with the Tokamak type reactors these two are the currently most promising types to achieve fusion and generate more energy than they take to operate. While the tokamakak type is looks more symmetrical to the human eye the stellerator type have adopted a very weird looking shape where the symmetries are more hidden. The pictures are from this paper by mostly people from the institute who to date created the biggest stellerator type fusion generator Wendelstein 7-x. The proposed prototype ‘Stelaris’ is a lot bigger than the 7-x.

Bonus (with little context):

And heres a shematic view oft how it would look like from outside. Just like a donut.