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China's $1 trillion 'artificial sun' fusion reactor just got five times hotter than the sun

China's "artificial sun," a tokamak reactor, has reached plasma temperatures five times hotter than the sun in a new record.
China's "artificial sun," a tokamak reactor, has reached plasma temperatures five times hotter than the sun in a new record. (Image credit: VCG via Getty Images)

China's "artificial sun" has set a new world record after superheating a loop of to temperatures five times hotter than the sun for more than 17 minutes, state media reported. 

The EAST (Experimental Advanced Superconducting Tokamak) reactor maintained a temperature of 158 million degrees Fahrenheit (70 million degrees Celsius) for 1,056 seconds, . The achievement brings scientists a small yet significant step closer to the creation of a source of near-unlimited clean energy.

"The recent operation lays a solid scientific and experimental foundation towards the running of a fusion reactor," experiment leader Gong Xianzu, a researcher at the Institute of Plasma Physics of the Chinese Academy of Sciences, . 

Scientists have been trying to harness the power of nuclear fusion — the process by which stars burn — for more than 70 years. By fusing atoms to make under extremely high pressures and temperatures, so-called main-sequence stars are able to convert matter into light and heat, generating enormous amounts of energy without producing or long-lasting radioactive waste.

But replicating the conditions found inside the hearts of stars is no simple task. The most common design for fusion reactors, the tokamak, works by superheating plasma (one of the four states of , consisting of positive ions and negatively-charged free electrons) before trapping it inside a donut-shaped reactor chamber with powerful .

Keeping the turbulent and superheated coils of plasma in place long enough for nuclear fusion to happen, however, has been a painstaking process. Soviet scientist Natan Yavlinsky designed the first tokamak in 1958, but no one has ever managed to create an experimental reactor that is able to put out more energy than it takes in.

One of the main stumbling blocks has been how to handle a plasma that's hot enough to fuse. Fusion reactors require very high temperatures — many times hotter than the sun — because they have to operate at much lower pressures than where fusion naturally takes place inside the cores of stars. Cooking plasma to temperatures hotter than the sun is the relatively easy part, but finding a way to corral it so that it doesn’t burn through the reactor walls (either with lasers or magnetic fields) without also ruining the fusion process is technically tricky.

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EAST is expected to cost China more than $1 trillion by the time the experiment finishes running in June, and it is being used to test out technologies for an even bigger fusion project — the International Thermonuclear Experimental Reactor (ITER) — that’s currently being built in Marseille, France.

Set to be the world's largest nuclear reactor and the product of collaboration between 35 countries — including every state in the European Union, the U.K., China, India and the U.S. — ITER contains the world's most powerful magnet, making it capable of producing a magnetic field 280,000 times as strong as the one around the Earth, . The fusion reactor is expected to come online in 2025, and it will provide scientists with even more insights into the practicalities of harnessing star power on Earth.

China is also pursuing more of its own programs to develop nuclear fusion power — it is conducting and is planning to complete a .

Elsewhere, the first viable fusion reactor could be , and a British company hopes to be by 2030.

Editor's note: Tom Metcalfe contributed to this article.

Originally published on Live Science.

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