thermonuclear reactor
fusion reactor

"And it was in the fusion reactor at the ground- based facility?"

But you're telling me they also do expensive research into fusion reactors and God knows what else.

Find a place for a fusion reactor if you must.

So far, all fusion reactors, big and small, fall short of this goal.

Our sun is a giant fusion reactor floating in space.

Despite research having started in the 1950s, no commercial fusion reactor is expected before 2050.

"The fusion reactor is ready for its first test run?"

I have work to do before the first test run of your fusion reactor.

Experimental fusion reactors do not yet produce more power than they take to run.

Her fusion reactors have to be brought back on line.