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The other way, known as magnetic confinement fusion, uses powerful magnets to trap a burning cloud of atoms called plasma.

"This method was proven to enhance plasma stability under different plasma conditions, for example, when the plasma was under conditions of high and low magnetic confinement."

So far, however, no magnetic confinement machine has achieved the extreme temperatures and pressure needed to achieve gain.

The answer long favored for reactor design is magnetic confinement: holding the electrically charged plasma in a “magnetic bottle” formed by strong magnetic fields so it never touches the walls of the fusion chamber.

That plasma can then be contained by powerful magnetic fields - an approach known as magnetic confinement fusion.