solar panels<\/a>, but the energy from sunlight also drives the wind and waves, and lets plants grow to turn into fossil fuels over millions of years.<\/p>\nFusion researchers try to create the hottest place in the Solar System by heating their fuel to a blistering 150 million \u00b0C. At those temperatures, light atoms like hydrogen hit each other so hard they can snap together to turn into heavier atoms like helium with a flash of heat and fast neutron particles \u2013 and no greenhouse gas emissions. By catching the hot fusion fuel in a cage of magnetic fields, you can have your artificial star burn as it floats in the middle of the machine. Meanwhile, the uncharged neutrons escape as heat that a generator can turn into electricity.<\/p>\n
Fusion is a nuclear process like fission, but creates much less shorter-lived radioactive products because it produces stable helium atoms instead of splitting uranium into unstable fragments. Fusion power plants will use a mix of heavier variants of the hydrogen gas that fuels our Sun, to make for more energetic collisions. The required deuterium occurs naturally in seawater, while its heavier brother, tritium, will need to be created at the fusion plant from the widely available metal lithium.<\/p>\n
The most popular and developed fusion device is the tokamak \u2013 a donut-shaped machine that levitates a ring of fusing hydrogen using powerful magnets. This workhorse of fusion is the design behind about 50 setups now operating worldwide. Those include the current fusion record holder, Joint European Torus (JET) in the UK, and future projects like the international ITER project and the European demonstration power plant, DEMO. But designing fusion devices that generate net energy can be challenging.<\/p>\n