It is hoped the nuclear fusion device will help scientists overcome a key problem in harnessing plasma inside tokamaks.
The team at Los Alamos National Laboratory will fire "supersonic jets of ionized gas" at a chamber to compress fusion fuel.
That's six times as hot as the center of the sun and a major breakthrough for nuclear fusion.
Being able to control plasma that is hotter than the Sun is notoriously difficult.
"Finding a star can at times be harder than finding a planet."
Scientists may have solved one major problem that comes up when building a fusion reactor—runaway electrons.