Fusion energy has the potential to be an effective clean energy source, as its reactions generate incredibly large amounts of energy. Fusion reactors aim to reproduce on Earth what happens in the core of the sun, where very light elements merge and release energy in the process. Engineers can harness this energy to heat water and generate electricity through a steam turbine, but the path to fusion isn't completely straightforward.
Controlled nuclear fusion has several advantages over other power sources for generating electricity. For one, the fusion reaction itself doesn't produce any carbon dioxide. There is no risk of meltdown, and the reaction doesn't generate any long-lived radioactive waste.
I'm a nuclear engineer who studies materials that scientists could use in fusion reactors. Fusion takes place at incredibly high temperatures. So to one day make fusion a feasible energy source, reactors will need to be built with materials that can survive the heat and irradiation generated by fusion reactions.
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